diff --git a/DotBased.AspNet.Authority/AuthorityProviderExtensions.cs b/DotBased.AspNet.Authority/AuthorityProviderExtensions.cs
index b99a7ec..7789c7b 100644
--- a/DotBased.AspNet.Authority/AuthorityProviderExtensions.cs
+++ b/DotBased.AspNet.Authority/AuthorityProviderExtensions.cs
@@ -21,9 +21,11 @@ public static class AuthorityProviderExtensions
             services.AddOptions();
             services.Configure<AuthorityOptions>(optionsAction);
         }
+        
         services.TryAddScoped<ICryptographer, Cryptographer>();
         services.TryAddScoped<IPasswordHasher, PasswordHasher>();
         services.TryAddScoped<IPasswordValidator<TUser>, PasswordOptionsValidator<TUser>>();
+        services.TryAddScoped<IPasswordValidator<TUser>, PasswordEqualsValidator<TUser>>();
         services.TryAddScoped<IUserValidator<TUser>, UserValidator<TUser>>();
         /*services.TryAddScoped<IEmailVerifier, EmailVerifier>();
         services.TryAddScoped<IPhoneNumberVerifier, PhoneNumberVerifier>();
@@ -44,4 +46,20 @@ public static class AuthorityProviderExtensions
     {
         return builder;
     }
+
+    private static Type GetBaseGenericArgumentType<TModel>(Type baseType)
+    {
+        var userGenericBaseTypeDefinition = typeof(TModel).BaseType?.GetGenericTypeDefinition();
+        if (userGenericBaseTypeDefinition != null && userGenericBaseTypeDefinition == baseType)
+        {
+            var userBaseGenericArguments = userGenericBaseTypeDefinition.GetGenericArguments();
+            if (userBaseGenericArguments.Length <= 0)
+            {
+                throw new ArgumentException("Base implementation does not have the required generic argument.", nameof(TModel));
+            }
+
+            return userBaseGenericArguments[0];
+        }
+        throw new ArgumentException($"Given object {typeof(TModel).Name} does not have the base implementation type of: {baseType.Name}", nameof(TModel));
+    }
 }
\ No newline at end of file
diff --git a/DotBased.AspNet.Authority/Models/Authority/AuthorityUser.cs b/DotBased.AspNet.Authority/Models/Authority/AuthorityUser.cs
index bbc919f..7f7f87a 100644
--- a/DotBased.AspNet.Authority/Models/Authority/AuthorityUser.cs
+++ b/DotBased.AspNet.Authority/Models/Authority/AuthorityUser.cs
@@ -16,10 +16,13 @@ public class AuthorityUser : AuthorityUser<Guid>
     }
 }
 
-public abstract class AuthorityUser<TKey> where TKey : IEquatable<TKey>
+public abstract class AuthorityUser<TKey> : AuthorityUserBase where TKey : IEquatable<TKey>
 {
     public TKey Id { get; set; }
-    
+}
+
+public abstract class AuthorityUserBase
+{
     public bool Enabled { get; set; }
     
     public bool Confirmed { get; set; }
diff --git a/DotBased.AspNet.Authority/Repositories/IUserRepository.cs b/DotBased.AspNet.Authority/Repositories/IUserRepository.cs
index 23c4c6e..0aa9893 100644
--- a/DotBased.AspNet.Authority/Repositories/IUserRepository.cs
+++ b/DotBased.AspNet.Authority/Repositories/IUserRepository.cs
@@ -1,9 +1,9 @@
 namespace DotBased.AspNet.Authority.Repositories;
 
-public interface IUserRepository<TUser, TId> where TUser : class where TId : IEquatable<TId>
+public interface IUserRepository<TUser> where TUser : class
 {
-    public Task<TUser?> GetUserByIdAsync(TId id);
-    public Task<TId> GetUserIdAsync(TUser user);
+    public Task<TUser?> GetUserByIdAsync(string id);
+    public Task<string> GetUserIdAsync(TUser user);
     public Task SetVersion(TUser user, long version);
     public Task SetSecurityVersion(TUser user, long version);
 }
\ No newline at end of file
diff --git a/DotBased.AspNet.Authority/Services/AuthorityManager.cs b/DotBased.AspNet.Authority/Services/AuthorityManager.cs
index 2cf9d19..d5e607a 100644
--- a/DotBased.AspNet.Authority/Services/AuthorityManager.cs
+++ b/DotBased.AspNet.Authority/Services/AuthorityManager.cs
@@ -32,6 +32,7 @@ public class AuthorityManager
 
 
     public long GenerateVersion() => DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
+    
 
     /// <summary>
     /// Protect or unprotect the properties with the <see cref="ProtectAttribute"/>
diff --git a/DotBased.AspNet.Authority/Services/AuthorityUserManager.cs b/DotBased.AspNet.Authority/Services/AuthorityUserManager.cs
index a02c8f3..a874760 100644
--- a/DotBased.AspNet.Authority/Services/AuthorityUserManager.cs
+++ b/DotBased.AspNet.Authority/Services/AuthorityUserManager.cs
@@ -1,17 +1,24 @@
+using DotBased.AspNet.Authority.Crypto;
+using DotBased.AspNet.Authority.Models.Validation;
+using DotBased.AspNet.Authority.Repositories;
 using DotBased.AspNet.Authority.Validators;
 using DotBased.Logging;
 
 namespace DotBased.AspNet.Authority.Services;
 
-public class AuthorityUserManager<TUser>
+public class AuthorityUserManager<TUser> where TUser : class
 {
     public AuthorityUserManager(
         AuthorityManager manager,
+        IUserRepository<TUser> userRepository,
+        IPasswordHasher passwordHasher,
         IEnumerable<IPasswordValidator<TUser>>? passwordValidators,
         IEnumerable<IUserValidator<TUser>>? userValidators)
     {
         _logger = LogService.RegisterLogger<AuthorityUserManager<TUser>>();
         AuthorityManager = manager;
+        UserRepository = userRepository;
+        PasswordHasher = passwordHasher;
         if (passwordValidators != null)
             PasswordValidators = passwordValidators;
         if (userValidators != null)
@@ -20,9 +27,24 @@ public class AuthorityUserManager<TUser>
 
     private readonly ILogger _logger;
     public AuthorityManager AuthorityManager { get; }
+    public IUserRepository<TUser> UserRepository { get; }
+    
+    public IPasswordHasher PasswordHasher { get; }
     
     public IEnumerable<IPasswordValidator<TUser>> PasswordValidators { get; } = [];
     public IEnumerable<IUserValidator<TUser>> UserValidators { get; } = [];
-    
-    
+
+    public async Task<ValidationResult> ValidatePasswordAsync(TUser user, string password)
+    {
+        List<ValidationError> errors = [];
+        foreach (var validator in PasswordValidators)
+        {
+            var validatorResult = await validator.ValidatePasswordAsync(this, user, password);
+            if (!validatorResult.Success)
+            {
+                errors.AddRange(validatorResult.Errors);
+            }
+        }
+        return errors.Count > 0 ? ValidationResult.Failed(errors) : ValidationResult.Ok();
+    }
 }
\ No newline at end of file
diff --git a/DotBased.AspNet.Authority/Validators/IPasswordValidator.cs b/DotBased.AspNet.Authority/Validators/IPasswordValidator.cs
index 07590ae..035038d 100644
--- a/DotBased.AspNet.Authority/Validators/IPasswordValidator.cs
+++ b/DotBased.AspNet.Authority/Validators/IPasswordValidator.cs
@@ -3,7 +3,7 @@ using DotBased.AspNet.Authority.Services;
 
 namespace DotBased.AspNet.Authority.Validators;
 
-public interface IPasswordValidator<TUser>
+public interface IPasswordValidator<TUser> where TUser : class
 {
-    public Task<ValidationResult> ValidatePasswordAsync(AuthorityUserManager<TUser> userManager, string password);
+    public Task<ValidationResult> ValidatePasswordAsync(AuthorityUserManager<TUser> userManager, TUser user, string password);
 }
\ No newline at end of file
diff --git a/DotBased.AspNet.Authority/Validators/PasswordEqualsValidator.cs b/DotBased.AspNet.Authority/Validators/PasswordEqualsValidator.cs
new file mode 100644
index 0000000..1d5071a
--- /dev/null
+++ b/DotBased.AspNet.Authority/Validators/PasswordEqualsValidator.cs
@@ -0,0 +1,27 @@
+using DotBased.AspNet.Authority.Models.Authority;
+using DotBased.AspNet.Authority.Models.Validation;
+using DotBased.AspNet.Authority.Services;
+
+namespace DotBased.AspNet.Authority.Validators;
+
+public class PasswordEqualsValidator<TUser> : IPasswordValidator<TUser> where TUser : class
+{
+    private const string ValidatorId = "Authority.Validator.Password.Equals";
+    private const string ValidationBase = "Authority.Validation.Password";
+    public async Task<ValidationResult> ValidatePasswordAsync(AuthorityUserManager<TUser> userManager, TUser user, string password)
+    {
+        if (user == null || user is not AuthorityUserBase authorityUser)
+        {
+            throw new ArgumentException("Invalid user given!", nameof(user));
+        }
+
+        List<ValidationError> errors = [];
+        var hashedPassword = await userManager.PasswordHasher.HashPasswordAsync(password);
+        if (authorityUser.PasswordHash != null && authorityUser.PasswordHash.Equals(hashedPassword, StringComparison.Ordinal))
+        {
+            errors.Add(new ValidationError(ValidatorId, $"{ValidationBase}.InUse", "User uses this password already!"));
+        }
+
+        return errors.Count > 0 ? ValidationResult.Failed(errors) : ValidationResult.Ok();
+    }
+}
\ No newline at end of file
diff --git a/DotBased.AspNet.Authority/Validators/PasswordOptionsValidator.cs b/DotBased.AspNet.Authority/Validators/PasswordOptionsValidator.cs
index 1360d3e..6bfcad0 100644
--- a/DotBased.AspNet.Authority/Validators/PasswordOptionsValidator.cs
+++ b/DotBased.AspNet.Authority/Validators/PasswordOptionsValidator.cs
@@ -8,12 +8,12 @@ namespace DotBased.AspNet.Authority.Validators;
 /// Validates the password against the options that is configured.
 /// </summary>
 /// <typeparam name="TUser">The user model used.</typeparam>
-public class PasswordOptionsValidator<TUser> : IPasswordValidator<TUser>
+public class PasswordOptionsValidator<TUser> : IPasswordValidator<TUser> where TUser : class
 {
     private const string ValidatorId = "Authority.Validator.Password.Options";
     private const string ValidationBase = "Authority.Validation.Password";
     
-    public async Task<ValidationResult> ValidatePasswordAsync(AuthorityUserManager<TUser> userManager, string password)
+    public async Task<ValidationResult> ValidatePasswordAsync(AuthorityUserManager<TUser> userManager, TUser user, string password)
     {
         if (userManager == null)
         {