diff --git a/BackEnd/src/main/java/studycave/studycaverestservice/model/user/UserDetailsServiceImpl.java b/BackEnd/src/main/java/studycave/studycaverestservice/model/user/UserDetailsServiceImpl.java
new file mode 100644
index 0000000..5b16035
--- /dev/null
+++ b/BackEnd/src/main/java/studycave/studycaverestservice/model/user/UserDetailsServiceImpl.java
@@ -0,0 +1,27 @@
+package studycave.studycaverestservice.model.user;
+
+import org.springframework.security.core.userdetails.User;
+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 static java.util.Collections.emptyList;
+
+@Service
+public class UserDetailsServiceImpl implements UserDetailsService {
+    private UserRepository applicationUserRepository;
+
+    public UserDetailsServiceImpl(UserRepository applicationUserRepository) {
+        this.applicationUserRepository = applicationUserRepository;
+    }
+
+    @Override
+    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
+        studycave.studycaverestservice.model.user.User applicationUser = applicationUserRepository.findByUsername(username).orElse(null);
+        if (applicationUser == null) {
+            throw new UsernameNotFoundException(username);
+        }
+        return new User(applicationUser.getUsername(), applicationUser.getPassword(), emptyList());
+    }
+}
diff --git a/BackEnd/src/main/java/studycave/studycaverestservice/security/JWTAuthenticationFilter.java b/BackEnd/src/main/java/studycave/studycaverestservice/security/JWTAuthenticationFilter.java
index 5218fa5..f35453d 100644
--- a/BackEnd/src/main/java/studycave/studycaverestservice/security/JWTAuthenticationFilter.java
+++ b/BackEnd/src/main/java/studycave/studycaverestservice/security/JWTAuthenticationFilter.java
@@ -15,6 +15,7 @@ import org.springframework.security.authentication.UsernamePasswordAuthenticatio
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.AuthenticationException;
 import org.springframework.security.core.userdetails.User;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
 import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
diff --git a/BackEnd/src/main/resources/application.properties b/BackEnd/src/main/resources/application.properties
index 902d768..c265803 100644
--- a/BackEnd/src/main/resources/application.properties
+++ b/BackEnd/src/main/resources/application.properties
@@ -6,10 +6,10 @@ spring.datasource.password=L0XIcnvtWpYEnr4w
 spring.servlet.multipart.max-file-size=500KB
 spring.servlet.multipart.max-request-size=500KB
 
-application.key = 5z57PPmtR4wXaRZDSpUH
-application.secret = ccAxvXDqLwdkPpekJrS2fdfGQ2jLnb22fa4uB5Ef
 
 #usos instance to use
 usos.baseURI=https://usosapps.amu.edu.pl
 usos.basePath=/services
 usos.port=443
+application.key = 5z57PPmtR4wXaRZDSpUH
+application.secret = ccAxvXDqLwdkPpekJrS2fdfGQ2jLnb22fa4uB5Ef
\ No newline at end of file