diff --git a/build-all.sh b/build-all.sh
index 0009f7d..6fb490c 100644
--- a/build-all.sh
+++ b/build-all.sh
@@ -52,6 +52,7 @@ build_gradle_module "spring-boot/startup"
 build_gradle_module "spring-boot/static"
 build_gradle_module "spring-boot/validation"
 build_gradle_module "spring-boot/profiles"
+build_gradle_module "spring-boot/password-encoding"
 build_gradle_module "spring-cloud/feign-with-spring-data-rest"
 build_gradle_module "spring-cloud/sleuth-downstream-service"
 build_gradle_module "spring-cloud/sleuth-upstream-service"
diff --git a/spring-boot/password-encoding/.gitignore b/spring-boot/password-encoding/.gitignore
new file mode 100644
index 0000000..6c01878
--- /dev/null
+++ b/spring-boot/password-encoding/.gitignore
@@ -0,0 +1,32 @@
+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**
+!**/src/test/**
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
diff --git a/spring-boot/password-encoding/build.gradle b/spring-boot/password-encoding/build.gradle
new file mode 100644
index 0000000..3a1e180
--- /dev/null
+++ b/spring-boot/password-encoding/build.gradle
@@ -0,0 +1,41 @@
+plugins {
+    id 'org.springframework.boot' version '2.2.2.RELEASE'
+    id 'io.spring.dependency-management' version '1.0.8.RELEASE'
+    id 'java'
+}
+
+group = 'io.reflectoring'
+version = '0.0.1-SNAPSHOT'
+description = 'password-encoding-spring-boot'
+sourceCompatibility = '11'
+
+
+repositories {
+    mavenCentral()
+}
+
+configurations {
+    compileOnly {
+        extendsFrom annotationProcessor
+    }
+}
+
+dependencies {
+    implementation 'org.springframework.boot:spring-boot-starter-security:2.2.4.RELEASE'
+    implementation 'org.springframework.boot:spring-boot-starter-web:2.2.4.RELEASE'
+    implementation 'org.springframework.boot:spring-boot-starter-data-jpa:2.2.4.RELEASE'
+    implementation 'com.h2database:h2:1.4.200'
+    implementation 'org.flywaydb:flyway-core:6.0.8'
+    implementation 'org.bouncycastle:bcprov-jdk15on:1.64'
+    implementation 'org.projectlombok:lombok:1.18.12'
+    annotationProcessor 'org.projectlombok:lombok'
+    annotationProcessor 'org.springframework.boot:spring-boot-configuration-processor'
+    implementation 'com.google.guava:guava:28.2-jre'
+    testImplementation 'org.springframework.boot:spring-boot-starter-test:2.2.4.RELEASE'
+    testImplementation 'org.springframework.security:spring-security-test:5.2.1.RELEASE'
+}
+
+
+test {
+    useJUnitPlatform()
+}
diff --git a/spring-boot/password-encoding/gradle/wrapper/gradle-wrapper.jar b/spring-boot/password-encoding/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..cc4fdc2
Binary files /dev/null and b/spring-boot/password-encoding/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/spring-boot/password-encoding/gradle/wrapper/gradle-wrapper.properties b/spring-boot/password-encoding/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..9492014
--- /dev/null
+++ b/spring-boot/password-encoding/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.0.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/spring-boot/password-encoding/gradlew b/spring-boot/password-encoding/gradlew
new file mode 100644
index 0000000..2fe81a7
--- /dev/null
+++ b/spring-boot/password-encoding/gradlew
@@ -0,0 +1,183 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
diff --git a/spring-boot/password-encoding/gradlew.bat b/spring-boot/password-encoding/gradlew.bat
new file mode 100644
index 0000000..9618d8d
--- /dev/null
+++ b/spring-boot/password-encoding/gradlew.bat
@@ -0,0 +1,100 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/PasswordEncodingSpringBootApplication.java b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/PasswordEncodingSpringBootApplication.java
new file mode 100644
index 0000000..5a23e82
--- /dev/null
+++ b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/PasswordEncodingSpringBootApplication.java
@@ -0,0 +1,13 @@
+package io.reflectoring.passwordencoding;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class PasswordEncodingSpringBootApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(PasswordEncodingSpringBootApplication.class, args);
+    }
+
+}
diff --git a/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/authentication/JdbcUserDetailPasswordService.java b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/authentication/JdbcUserDetailPasswordService.java
new file mode 100644
index 0000000..d150a1f
--- /dev/null
+++ b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/authentication/JdbcUserDetailPasswordService.java
@@ -0,0 +1,28 @@
+package io.reflectoring.passwordencoding.authentication;
+
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.core.userdetails.UserDetailsPasswordService;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Transactional
+@Service
+public class JdbcUserDetailPasswordService implements UserDetailsPasswordService {
+
+    private final UserRepository userRepository;
+
+    private final UserDetailsMapper userDetailsMapper;
+
+    public JdbcUserDetailPasswordService(UserRepository userRepository, UserDetailsMapper userDetailsMapper) {
+        this.userRepository = userRepository;
+        this.userDetailsMapper = userDetailsMapper;
+    }
+
+
+    @Override
+    public UserDetails updatePassword(UserDetails user, String newPassword) {
+        UserCredentials userCredentials = userRepository.findByUsername(user.getUsername());
+        userCredentials.setPassword(newPassword);
+        return userDetailsMapper.toUserDetails(userCredentials);
+    }
+}
diff --git a/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/authentication/JdbcUserDetailsService.java b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/authentication/JdbcUserDetailsService.java
new file mode 100644
index 0000000..a9beaa2
--- /dev/null
+++ b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/authentication/JdbcUserDetailsService.java
@@ -0,0 +1,28 @@
+package io.reflectoring.passwordencoding.authentication;
+
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@Transactional
+public class JdbcUserDetailsService implements UserDetailsService {
+
+    private final UserRepository userRepository;
+
+    private final UserDetailsMapper userDetailsMapper;
+
+    public JdbcUserDetailsService(UserRepository userRepository, UserDetailsMapper userDetailsMapper) {
+        this.userRepository = userRepository;
+        this.userDetailsMapper = userDetailsMapper;
+    }
+
+
+    @Override
+    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
+        UserCredentials userCredentials = userRepository.findByUsername(username);
+        return userDetailsMapper.toUserDetails(userCredentials);
+    }
+}
diff --git a/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/authentication/UserCredentials.java b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/authentication/UserCredentials.java
new file mode 100644
index 0000000..48b48b1
--- /dev/null
+++ b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/authentication/UserCredentials.java
@@ -0,0 +1,31 @@
+package io.reflectoring.passwordencoding.authentication;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+import java.util.Set;
+
+@Entity
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+@Table(name = "users")
+public class UserCredentials {
+
+    @Id
+    private String username;
+
+    private String password;
+
+    boolean enabled;
+
+    @ElementCollection
+    @JoinTable(name = "authorities", joinColumns = {@JoinColumn(name = "username")})
+    @Column(name = "authority")
+    private Set<String> roles;
+}
+
diff --git a/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/authentication/UserDetailsMapper.java b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/authentication/UserDetailsMapper.java
new file mode 100644
index 0000000..de6085d
--- /dev/null
+++ b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/authentication/UserDetailsMapper.java
@@ -0,0 +1,18 @@
+package io.reflectoring.passwordencoding.authentication;
+
+import org.springframework.security.core.userdetails.User;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.stereotype.Component;
+
+@Component
+public class UserDetailsMapper {
+
+    UserDetails toUserDetails(UserCredentials userCredentials) {
+
+        return User
+                .withUsername(userCredentials.getUsername())
+                .password(userCredentials.getPassword())
+                .roles(userCredentials.getRoles().toArray(String[]::new))
+                .build();
+    }
+}
diff --git a/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/authentication/UserRepository.java b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/authentication/UserRepository.java
new file mode 100644
index 0000000..61b67d7
--- /dev/null
+++ b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/authentication/UserRepository.java
@@ -0,0 +1,10 @@
+package io.reflectoring.passwordencoding.authentication;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.transaction.annotation.Transactional;
+
+@Transactional
+public interface UserRepository extends JpaRepository<UserCredentials, String> {
+
+    UserCredentials findByUsername(String username);
+}
diff --git a/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/configuration/SecurityConfiguration.java b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/configuration/SecurityConfiguration.java
new file mode 100644
index 0000000..f32704a
--- /dev/null
+++ b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/configuration/SecurityConfiguration.java
@@ -0,0 +1,101 @@
+package io.reflectoring.passwordencoding.configuration;
+
+import io.reflectoring.passwordencoding.authentication.JdbcUserDetailPasswordService;
+import io.reflectoring.passwordencoding.authentication.JdbcUserDetailsService;
+import io.reflectoring.passwordencoding.authentication.UserDetailsMapper;
+import io.reflectoring.passwordencoding.authentication.UserRepository;
+import io.reflectoring.passwordencoding.workfactor.BcCryptWorkFactorService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.authentication.dao.DaoAuthenticationProvider;
+import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
+import org.springframework.security.core.userdetails.UserDetailsPasswordService;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.security.crypto.argon2.Argon2PasswordEncoder;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.security.crypto.password.DelegatingPasswordEncoder;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.security.crypto.password.Pbkdf2PasswordEncoder;
+import org.springframework.security.crypto.scrypt.SCryptPasswordEncoder;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@Configuration
+@EnableWebSecurity
+public class SecurityConfiguration extends WebSecurityConfigurerAdapter {
+
+
+    private final UserRepository userRepository;
+    private final UserDetailsMapper userDetailsMapper;
+    private final BcCryptWorkFactorService bcCryptWorkFactorService;
+
+    public SecurityConfiguration(UserRepository userRepository, UserDetailsMapper userDetailsMapper, BcCryptWorkFactorService bcCryptWorkFactorService) {
+        this.userRepository = userRepository;
+        this.userDetailsMapper = userDetailsMapper;
+        this.bcCryptWorkFactorService = bcCryptWorkFactorService;
+    }
+
+    @Override
+    protected void configure(HttpSecurity httpSecurity) throws Exception {
+        httpSecurity
+                .csrf().disable()
+                .authorizeRequests()
+                .antMatchers("/registration").permitAll()
+                .anyRequest().authenticated()
+                .and()
+                .httpBasic();
+
+        httpSecurity.headers().frameOptions().disable();
+    }
+
+    @Autowired
+    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
+        auth
+                .authenticationProvider(daoAuthenticationProvider())
+                .eraseCredentials(false);
+    }
+
+
+    @Bean
+    public PasswordEncoder passwordEncoder() {
+        // we must user deprecated encoder to support their encoding
+        String encodingId = "bcrypt";
+        Map<String, PasswordEncoder> encoders = new HashMap<>();
+        encoders.put(encodingId, new BCryptPasswordEncoder(bcCryptWorkFactorService.calculateStrength()));
+        encoders.put("ldap", new org.springframework.security.crypto.password.LdapShaPasswordEncoder());
+        encoders.put("MD4", new org.springframework.security.crypto.password.Md4PasswordEncoder());
+        encoders.put("MD5", new org.springframework.security.crypto.password.MessageDigestPasswordEncoder("MD5"));
+        encoders.put("noop", org.springframework.security.crypto.password.NoOpPasswordEncoder.getInstance());
+        encoders.put("pbkdf2", new Pbkdf2PasswordEncoder());
+        encoders.put("scrypt", new SCryptPasswordEncoder());
+        encoders.put("SHA-1", new org.springframework.security.crypto.password.MessageDigestPasswordEncoder("SHA-1"));
+        encoders.put("SHA-256", new org.springframework.security.crypto.password.MessageDigestPasswordEncoder("SHA-256"));
+        encoders.put("sha256", new org.springframework.security.crypto.password.StandardPasswordEncoder());
+        encoders.put("argon2", new Argon2PasswordEncoder());
+
+        return new DelegatingPasswordEncoder(encodingId, encoders);
+    }
+
+    @Bean
+    public UserDetailsPasswordService userDetailsPasswordService() {
+        return new JdbcUserDetailPasswordService(userRepository, userDetailsMapper);
+    }
+
+    public UserDetailsService userDetailsService() {
+        return new JdbcUserDetailsService(userRepository, userDetailsMapper);
+    }
+
+    @Bean
+    public DaoAuthenticationProvider daoAuthenticationProvider() {
+        DaoAuthenticationProvider daoAuthenticationProvider = new DaoAuthenticationProvider();
+        daoAuthenticationProvider.setPasswordEncoder(passwordEncoder());
+        daoAuthenticationProvider.setUserDetailsPasswordService(userDetailsPasswordService());
+        daoAuthenticationProvider.setUserDetailsService(userDetailsService());
+        return daoAuthenticationProvider;
+    }
+}
diff --git a/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/migration/PasswordMigration.java b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/migration/PasswordMigration.java
new file mode 100644
index 0000000..1ab6f8a
--- /dev/null
+++ b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/migration/PasswordMigration.java
@@ -0,0 +1,33 @@
+package io.reflectoring.passwordencoding.migration;
+
+import org.springframework.context.ApplicationListener;
+import org.springframework.context.annotation.Bean;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.security.authentication.event.AuthenticationSuccessEvent;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.userdetails.User;
+import org.springframework.security.core.userdetails.UserDetailsPasswordService;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.stereotype.Component;
+
+@Component
+public class PasswordMigration {
+
+    @Bean
+    public ApplicationListener<AuthenticationSuccessEvent> authenticationSuccessListener(
+            PasswordEncoder encoder,
+            UserDetailsPasswordService userDetailsPasswordService) {
+        return (AuthenticationSuccessEvent event) -> {
+            Authentication authentication = event.getAuthentication();
+            User user = (User) authentication.getPrincipal();
+            String encodedPassword = user.getPassword();
+            if (encodedPassword.startsWith("{SHA-1}")) {
+                CharSequence clearTextPassword = (CharSequence) authentication.getCredentials();
+                String newPassword = encoder.encode(clearTextPassword);
+                userDetailsPasswordService.updatePassword(user, newPassword);
+            }
+            ((UsernamePasswordAuthenticationToken) authentication).eraseCredentials();
+        };
+    }
+
+}
diff --git a/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/resources/Car.java b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/resources/Car.java
new file mode 100644
index 0000000..98eacfd
--- /dev/null
+++ b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/resources/Car.java
@@ -0,0 +1,16 @@
+package io.reflectoring.passwordencoding.resources;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@NoArgsConstructor
+@Data
+@Builder
+@AllArgsConstructor
+public class Car {
+
+    private String name;
+    private String color;
+}
diff --git a/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/resources/CarResources.java b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/resources/CarResources.java
new file mode 100644
index 0000000..db68b8d
--- /dev/null
+++ b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/resources/CarResources.java
@@ -0,0 +1,26 @@
+package io.reflectoring.passwordencoding.resources;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.Set;
+
+@RestController
+public class CarResources {
+
+    // we use this endpoint as authentication test
+    @GetMapping("/cars")
+    public Set<Car> cars() {
+        return Set.of(
+                Car.builder()
+                        .name("vw")
+                        .color("black")
+                        .build(),
+                Car.builder()
+                        .name("bmw")
+                        .color("white")
+                        .build()
+        );
+    }
+}
+
diff --git a/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/resources/UserCredentialsDto.java b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/resources/UserCredentialsDto.java
new file mode 100644
index 0000000..e38695f
--- /dev/null
+++ b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/resources/UserCredentialsDto.java
@@ -0,0 +1,16 @@
+package io.reflectoring.passwordencoding.resources;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@Builder
+@AllArgsConstructor
+@NoArgsConstructor
+public class UserCredentialsDto {
+
+    private String username;
+    private String password;
+}
diff --git a/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/resources/UserResources.java b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/resources/UserResources.java
new file mode 100644
index 0000000..62b6a16
--- /dev/null
+++ b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/resources/UserResources.java
@@ -0,0 +1,39 @@
+package io.reflectoring.passwordencoding.resources;
+
+import io.reflectoring.passwordencoding.authentication.UserCredentials;
+import io.reflectoring.passwordencoding.authentication.UserRepository;
+import org.springframework.http.HttpStatus;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.Set;
+
+@RestController
+@Transactional
+public class UserResources {
+
+    private final UserRepository userRepository;
+    private final PasswordEncoder passwordEncoder;
+
+    public UserResources(UserRepository userRepository, PasswordEncoder passwordEncoder) {
+        this.userRepository = userRepository;
+        this.passwordEncoder = passwordEncoder;
+    }
+
+
+    @PostMapping("/registration")
+    @ResponseStatus(code = HttpStatus.CREATED)
+    public void register(@RequestBody UserCredentialsDto userCredentialsDto) {
+        UserCredentials user = UserCredentials.builder()
+                .enabled(true)
+                .username(userCredentialsDto.getUsername())
+                .password(passwordEncoder.encode(userCredentialsDto.getPassword()))
+                .roles(Set.of("USER"))
+                .build();
+        userRepository.save(user);
+    }
+}
diff --git a/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/workfactor/BcCryptWorkFactorService.java b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/workfactor/BcCryptWorkFactorService.java
new file mode 100644
index 0000000..688b358
--- /dev/null
+++ b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/workfactor/BcCryptWorkFactorService.java
@@ -0,0 +1,92 @@
+package io.reflectoring.passwordencoding.workfactor;
+
+import com.google.common.base.Stopwatch;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.stereotype.Component;
+
+import java.util.concurrent.TimeUnit;
+
+@Component
+public class BcCryptWorkFactorService {
+
+    private static final String TEST_PASSWORD = "my password";
+    private static final int GOAL_MILLISECONDS_PER_PASSWORD = 1000;
+    private static final int MIN_STRENGTH = 4;
+    private static final int MAX_STRENGTH = 31;
+
+
+    /**
+     * Calculates the strength (a.k.a. log rounds) for the BCrypt Algorithm, so that password encoding takes about 1s.
+     * This method iterates over strength from 4 to 31 and calculates the duration of password encoding for every value of strength.
+     * It returns the first strength, that takes more than 500s
+     */
+    public int calculateStrength() {
+        for (int strength = MIN_STRENGTH; strength <= MAX_STRENGTH; strength++) {
+
+            BCryptPasswordEncoder bCryptPasswordEncoder = new BCryptPasswordEncoder(strength);
+
+            Stopwatch stopwatch = Stopwatch.createStarted();
+            bCryptPasswordEncoder.encode(TEST_PASSWORD);
+            stopwatch.stop();
+
+            long duration = stopwatch.elapsed(TimeUnit.MILLISECONDS);
+            if (duration >= GOAL_MILLISECONDS_PER_PASSWORD) {
+                return strength;
+            }
+        }
+        throw new RuntimeException(String.format("Could not find suitable round number for bcrypt encoding. The encoding with %d rounds" +
+                " takes less than %d ms.", MAX_STRENGTH, GOAL_MILLISECONDS_PER_PASSWORD));
+    }
+
+    /**
+     * Calculates the strength (a.k.a. log rounds) for the BCrypt Algorithm, so that password encoding takes about 1s.
+     * This method iterate over strength from 4 to 31 and calculates the duration of password encoding for every value of strength.
+     * When the the duration takes more than 1s, it is compared to previous one and the method returns the strength, tha is closer
+     * to 1s.
+     */
+    public int calculateStrengthClosestToTimeGoal() {
+
+        long previousDuration = Long.MIN_VALUE;
+        for (int strength = MIN_STRENGTH; strength <= MAX_STRENGTH; strength++) {
+            BCryptPasswordEncoder bCryptPasswordEncoder = new BCryptPasswordEncoder(strength);
+
+            Stopwatch stopwatch = Stopwatch.createStarted();
+            bCryptPasswordEncoder.encode(TEST_PASSWORD);
+            stopwatch.stop();
+            long currentDuration = stopwatch.elapsed(TimeUnit.MILLISECONDS);
+
+            if (isGreaterThanGoal(currentDuration)) {
+                return getStrength(previousDuration, currentDuration, strength);
+            }
+            previousDuration = currentDuration;
+        }
+        throw new RuntimeException(String.format("Could not find suitable round number for bcrypt encoding. The encoding with %d rounds" +
+                " takes less than %d ms.", MAX_STRENGTH, GOAL_MILLISECONDS_PER_PASSWORD));
+    }
+
+    /**
+     * @param previousDuration duration from previous iteration
+     * @param currentDuration  duration of current iteration
+     * @param strength         current strength
+     * @return return the current strength, if current duration is closer to GOAL_MILLISECONDS_PER_PASSWORD, otherwise
+     * current strength-1.
+     */
+    int getStrength(long previousDuration, long currentDuration, int strength) {
+        if (isPreviousDurationCloserToGoal(previousDuration, currentDuration)) {
+            return strength - 1;
+        } else {
+            return strength;
+        }
+    }
+
+    private boolean isGreaterThanGoal(long duration) {
+        return duration > GOAL_MILLISECONDS_PER_PASSWORD;
+    }
+
+    /**
+     * return true, if previousDuration is closer to the goal than currentDuration, false otherwise.
+     */
+    boolean isPreviousDurationCloserToGoal(long previousDuration, long currentDuration) {
+        return Math.abs(GOAL_MILLISECONDS_PER_PASSWORD - previousDuration) < Math.abs(GOAL_MILLISECONDS_PER_PASSWORD - currentDuration);
+    }
+}
diff --git a/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/workfactor/Pbkdf2WorkFactorService.java b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/workfactor/Pbkdf2WorkFactorService.java
new file mode 100644
index 0000000..3bf734f
--- /dev/null
+++ b/spring-boot/password-encoding/src/main/java/io/reflectoring/passwordencoding/workfactor/Pbkdf2WorkFactorService.java
@@ -0,0 +1,39 @@
+package io.reflectoring.passwordencoding.workfactor;
+
+import com.google.common.base.Stopwatch;
+import org.springframework.security.crypto.password.Pbkdf2PasswordEncoder;
+import org.springframework.stereotype.Component;
+
+import java.util.concurrent.TimeUnit;
+
+@Component
+public class Pbkdf2WorkFactorService {
+
+    private static final String TEST_PASSWORD = "my password";
+    private static final String NO_ADDITIONAL_SECRET = "";
+    private static final int GOAL_MILLISECONDS_PER_PASSWORD = 1000;
+    private static final int HASH_WIDTH = 256;
+    private static final int ITERATION_STEP = 5000;
+
+    /**
+     * Finds the number of Iteration for the {@link Pbkdf2PasswordEncoder} to get the duration of password encoding
+     * close to 1s. The Calculation does not use any secret (pepper) and applies hash algorithm SHA256.
+     */
+    public int calculateIteration() {
+
+        int iterationNumber = 150000;
+        while (true) {
+            Pbkdf2PasswordEncoder pbkdf2PasswordEncoder = new Pbkdf2PasswordEncoder(NO_ADDITIONAL_SECRET, iterationNumber, HASH_WIDTH);
+
+            Stopwatch stopwatch = Stopwatch.createStarted();
+            pbkdf2PasswordEncoder.encode(TEST_PASSWORD);
+            stopwatch.stop();
+
+            long duration = stopwatch.elapsed(TimeUnit.MILLISECONDS);
+            if (duration > GOAL_MILLISECONDS_PER_PASSWORD) {
+                return iterationNumber;
+            }
+            iterationNumber += ITERATION_STEP;
+        }
+    }
+}
diff --git a/spring-boot/password-encoding/src/main/resources/application.yaml b/spring-boot/password-encoding/src/main/resources/application.yaml
new file mode 100644
index 0000000..3d20cdb
--- /dev/null
+++ b/spring-boot/password-encoding/src/main/resources/application.yaml
@@ -0,0 +1,11 @@
+spring:
+  h2:
+    console:
+      enabled: true
+  datasource:
+    url: jdbc:h2:mem:testdb
+    driverClassName: org.h2.Driver
+    username: sa
+    password:
+  jpa:
+    database-platform: org.hibernate.dialect.H2Dialect
diff --git a/spring-boot/password-encoding/src/main/resources/db/migration/V1_1__create_user_tables.sql b/spring-boot/password-encoding/src/main/resources/db/migration/V1_1__create_user_tables.sql
new file mode 100644
index 0000000..e7ace3a
--- /dev/null
+++ b/spring-boot/password-encoding/src/main/resources/db/migration/V1_1__create_user_tables.sql
@@ -0,0 +1,14 @@
+create table users
+(
+    username varchar_ignorecase(50) not null primary key,
+    password varchar(2048)          not null,
+    enabled  boolean                not null
+);
+
+create table authorities
+(
+    username  varchar_ignorecase(50) not null,
+    authority varchar_ignorecase(50) not null,
+    constraint fk_authorities_users foreign key (username) references users (username)
+);
+create unique index ix_auth_username on authorities (username, authority);
\ No newline at end of file
diff --git a/spring-boot/password-encoding/src/main/resources/db/migration/V1_2__add user.sql b/spring-boot/password-encoding/src/main/resources/db/migration/V1_2__add user.sql
new file mode 100644
index 0000000..6eeef98
--- /dev/null
+++ b/spring-boot/password-encoding/src/main/resources/db/migration/V1_2__add user.sql	
@@ -0,0 +1,5 @@
+insert into users (username, password, enabled) VALUES ('admin', '{bcrypt}$2a$10$4V9kA793Pi2xf94dYFgKWuw8ukyETxWb7tZ4/mfco9sWkwvBQndxW', true);
+insert into users (username, password, enabled) VALUES ('user', '{SHA-256}{4Cc0+yDMHnTUy+zOHeMH7yaPhxvlJT//tQTwEhyegiQ=}446d06130bfc254527a7bbd95b50595a977c0058110f8dccb54bd273d99325b8', true);
+insert into users (username, password, enabled) VALUES ('user with working factor 5', '{bcrypt}$2a$05$Zz4rToG8YXKMbuAPgm3qj.HpTFsGEdZHhCf9ikIHAoI5elX7ajNm.', true);
+insert into users (username, password, enabled) VALUES ('user with sha1 encoding', '{SHA-1}{6tND0AZfFH3aE1VDg7QkWT6DzFg/NUHtukntgwu8JV4=}804c6e8efebf4e91f88e3baf9fd383e28a21378c', true);
+insert into users (username, password, enabled) VALUES ('scrypt user', '{scrypt}$e0801$fUx3MxN07zdH3UyARJqOwv3WiWCvE7f6qRm9A5KQfNo5ovSwxMHknQ4vERO4csj/I3imG2HJQg1HHp7Rqzbp7g==$Fm5F9PSoE/jBYLOmnCJcvX1Euf952r5b3BjAl+SwQMs=', true);
\ No newline at end of file
diff --git a/spring-boot/password-encoding/src/test/java/io/reflectoring/passwordencoding/authentication/UserDetailsMapperTest.java b/spring-boot/password-encoding/src/test/java/io/reflectoring/passwordencoding/authentication/UserDetailsMapperTest.java
new file mode 100644
index 0000000..666ab15
--- /dev/null
+++ b/spring-boot/password-encoding/src/test/java/io/reflectoring/passwordencoding/authentication/UserDetailsMapperTest.java
@@ -0,0 +1,32 @@
+package io.reflectoring.passwordencoding.authentication;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.security.core.userdetails.UserDetails;
+
+import java.util.Set;
+
+import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
+
+class UserDetailsMapperTest {
+
+    private UserDetailsMapper userDetailsMapper = new UserDetailsMapper();
+
+    @Test
+    void toUserDetails() {
+        // given
+        UserCredentials userCredentials = UserCredentials.builder()
+                .enabled(true)
+                .password("password")
+                .username("user")
+                .roles(Set.of("USER", "ADMIN"))
+                .build();
+
+        // when
+        UserDetails userDetails = userDetailsMapper.toUserDetails(userCredentials);
+
+        // then
+        assertThat(userDetails.getUsername()).isEqualTo("user");
+        assertThat(userDetails.getPassword()).isEqualTo("password");
+        assertThat(userDetails.isEnabled()).isTrue();
+    }
+}
\ No newline at end of file
diff --git a/spring-boot/password-encoding/src/test/java/io/reflectoring/passwordencoding/authentication/UserRepositoryTest.java b/spring-boot/password-encoding/src/test/java/io/reflectoring/passwordencoding/authentication/UserRepositoryTest.java
new file mode 100644
index 0000000..4d2bc2a
--- /dev/null
+++ b/spring-boot/password-encoding/src/test/java/io/reflectoring/passwordencoding/authentication/UserRepositoryTest.java
@@ -0,0 +1,26 @@
+package io.reflectoring.passwordencoding.authentication;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+
+import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
+
+@DataJpaTest
+class UserRepositoryTest {
+
+    @Autowired
+    private UserRepository userRepository;
+
+    @Test
+    void findUserByUsername() {
+        // given
+        String username = "user";
+
+        // when
+        UserCredentials userCredentials = userRepository.findByUsername(username);
+
+        // then
+        assertThat(userCredentials).isNotNull();
+    }
+}
\ No newline at end of file
diff --git a/spring-boot/password-encoding/src/test/java/io/reflectoring/passwordencoding/resources/CarResourcesTest.java b/spring-boot/password-encoding/src/test/java/io/reflectoring/passwordencoding/resources/CarResourcesTest.java
new file mode 100644
index 0000000..99a734f
--- /dev/null
+++ b/spring-boot/password-encoding/src/test/java/io/reflectoring/passwordencoding/resources/CarResourcesTest.java
@@ -0,0 +1,94 @@
+package io.reflectoring.passwordencoding.resources;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import io.reflectoring.passwordencoding.authentication.UserCredentials;
+import io.reflectoring.passwordencoding.authentication.UserRepository;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.transaction.annotation.Transactional;
+
+import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
+import static org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestPostProcessors.httpBasic;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@SpringBootTest
+@AutoConfigureMockMvc
+@Transactional
+class CarResourcesTest {
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Autowired
+    private ObjectMapper objectMapper;
+
+    @Autowired
+    private UserRepository userRepository;
+
+    @Test
+    void getCarsShouldReturnUnauthorizedIfTheRequestHasNoBasicAuthentication() throws Exception {
+        mockMvc.perform(get("/cars"))
+                .andExpect(status().isUnauthorized());
+    }
+
+    @Test
+    void getCarsShouldReturnCarsForTheAuthenticatedUser() throws Exception {
+        mockMvc.perform(get("/cars")
+                .with(httpBasic("user", "password")))
+                .andExpect(status().isOk());
+    }
+
+    @Test
+    void registrationShouldReturnCreated() throws Exception {
+
+        // register
+        UserCredentialsDto userCredentialsDto = UserCredentialsDto.builder().username("toyota").password("my secret").build();
+        mockMvc.perform(post("/registration")
+                .contentType(MediaType.APPLICATION_JSON_VALUE)
+                .content(objectMapper.writeValueAsString(userCredentialsDto)))
+                .andExpect(status().isCreated());
+    }
+
+    @Test
+    void registrationShouldReturnUnauthorizedWithWrongCredentials() throws Exception {
+
+        mockMvc.perform(get("/cars")
+                .with(httpBasic("user", "wrong password")))
+                .andExpect(status().isUnauthorized());
+    }
+
+    @Test
+    void getCarsShouldUpdatePasswordFromWorkingFactor5toHigherValue() throws Exception {
+        mockMvc.perform(get("/cars")
+                .with(httpBasic("user with working factor 5", "password")))
+                .andExpect(status().isOk());
+
+        UserCredentials userCredentials = userRepository.findByUsername("user with working factor 5");
+        // we don't know what strength the BcCryptWorkFactorService returns,
+        // but it should be more than 5
+        assertThat(userCredentials.getPassword()).doesNotStartWith("{bcrypt}$2a$05");
+    }
+
+    @Test
+    void getCarsShouldUpdateSha1PasswordToBcrypt() throws Exception {
+        mockMvc.perform(get("/cars")
+                .with(httpBasic("user with sha1 encoding", "password")))
+                .andExpect(status().isOk());
+
+        UserCredentials userCredentials = userRepository.findByUsername("user with sha1 encoding");
+        assertThat(userCredentials.getPassword()).startsWith("{bcrypt}");
+    }
+
+    @Test
+    void getCarsShouldReturnOkForScryptUser() throws Exception {
+        mockMvc.perform(get("/cars")
+                .with(httpBasic("scrypt user", "password")))
+                .andExpect(status().isOk());
+    }
+}
\ No newline at end of file
diff --git a/spring-boot/password-encoding/src/test/java/io/reflectoring/passwordencoding/workfactor/BcCryptWorkFactorServiceTest.java b/spring-boot/password-encoding/src/test/java/io/reflectoring/passwordencoding/workfactor/BcCryptWorkFactorServiceTest.java
new file mode 100644
index 0000000..6cc2c1d
--- /dev/null
+++ b/spring-boot/password-encoding/src/test/java/io/reflectoring/passwordencoding/workfactor/BcCryptWorkFactorServiceTest.java
@@ -0,0 +1,121 @@
+package io.reflectoring.passwordencoding.workfactor;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+
+class BcCryptWorkFactorServiceTest {
+
+    private BcCryptWorkFactorService bcCryptWorkFactorService = new BcCryptWorkFactorService();
+
+    @Test
+    void calculateStrength() {
+        // given
+
+        // when
+        int strength = bcCryptWorkFactorService.calculateStrength();
+
+        BCryptPasswordEncoder bCryptPasswordEncoder = new BCryptPasswordEncoder(strength);
+
+        // then
+        assertThat(strength).isBetween(4, 31);
+    }
+
+    @Test
+    void calculateRounds() {
+        // given
+
+        // when
+        int strength = bcCryptWorkFactorService.calculateStrengthClosestToTimeGoal();
+
+        // then
+        assertThat(strength).isBetween(4, 31);
+    }
+
+    @Test
+    void findCloserToShouldReturnNumber1IfItCloserToGoalThanNumber2() {
+        // given
+        int number1 = 950;
+        int number2 = 1051;
+
+        // when
+        boolean actual = bcCryptWorkFactorService.isPreviousDurationCloserToGoal(number1, number2);
+
+        // then
+        assertThat(actual).isTrue();
+    }
+
+    @Test
+    void findCloserToShouldReturnNUmber2IfItCloserToGoalThanNumber1() {
+        // given
+        int number1 = 1002;
+        int number2 = 999;
+
+        // when
+        boolean actual = bcCryptWorkFactorService.isPreviousDurationCloserToGoal(number1, number2);
+
+        // then
+        assertThat(actual).isFalse();
+    }
+
+    @Test
+    void findCloserToShouldReturnGoalIfNumber2IsEqualGoal() {
+        // given
+        int number1 = 999;
+        int number2 = 1000;
+
+        // when
+        boolean actual = bcCryptWorkFactorService.isPreviousDurationCloserToGoal(number1, number2);
+
+        // then
+        assertThat(actual).isFalse();
+    }
+
+    @Test
+    void findCloserToShouldReturnGoalIfNumber1IsEqualGoal() {
+        // given
+        int number1 = 1000;
+        int number2 = 1001;
+
+        // when
+        boolean actual = bcCryptWorkFactorService.isPreviousDurationCloserToGoal(number1, number2);
+
+        // then
+        assertThat(actual).isTrue();
+    }
+
+    @Test
+    void getStrengthShouldReturn4IfStrengthIs4() {
+        // given
+        int currentStrength = 4;
+
+        // when
+        int actual = bcCryptWorkFactorService.getStrength(0, 0, currentStrength);
+
+        // then
+        assertThat(actual).isEqualTo(4);
+    }
+
+    @Test
+    void getStrengthShouldReturnPreviousStrengthIfPreviousDurationCloserToGoal() {
+        // given
+
+        // when
+        int actual = bcCryptWorkFactorService.getStrength(980, 1021, 5);
+
+        // then
+        assertThat(actual).isEqualTo(4);
+    }
+
+    @Test
+    void getStrengthShouldReturnCurrentStrengthIfCurrentDurationCloserToGoal() {
+        // given
+
+        // when
+        int actual = bcCryptWorkFactorService.getStrength(960, 1021, 5);
+
+        // then
+        assertThat(actual).isEqualTo(5);
+    }
+}
\ No newline at end of file
diff --git a/spring-boot/password-encoding/src/test/java/io/reflectoring/passwordencoding/workfactor/Pbkdf2WorkFactorServiceTest.java b/spring-boot/password-encoding/src/test/java/io/reflectoring/passwordencoding/workfactor/Pbkdf2WorkFactorServiceTest.java
new file mode 100644
index 0000000..49f5447
--- /dev/null
+++ b/spring-boot/password-encoding/src/test/java/io/reflectoring/passwordencoding/workfactor/Pbkdf2WorkFactorServiceTest.java
@@ -0,0 +1,22 @@
+package io.reflectoring.passwordencoding.workfactor;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+
+class Pbkdf2WorkFactorServiceTest {
+
+
+    private Pbkdf2WorkFactorService pbkdf2WorkFactorService = new Pbkdf2WorkFactorService();
+
+    @Test
+    void calculateIteration() {
+        // given
+
+        // when
+        int iterationNumber = pbkdf2WorkFactorService.calculateIteration();
+
+        // then
+        assertThat(iterationNumber).isGreaterThanOrEqualTo(150000);
+    }
+}
\ No newline at end of file