diff --git a/src/Elektrifikatsiya/Elektrifikatsiya/Database/UserDatabaseContext.cs b/src/Elektrifikatsiya/Elektrifikatsiya/Database/UserDatabaseContext.cs
index 917764f..b3a6730 100644
--- a/src/Elektrifikatsiya/Elektrifikatsiya/Database/UserDatabaseContext.cs
+++ b/src/Elektrifikatsiya/Elektrifikatsiya/Database/UserDatabaseContext.cs
@@ -6,5 +6,9 @@ namespace Elektrifikatsiya.Database;
 
 public class UserDatabaseContext : DbContext
 {
+    public UserDatabaseContext(DbContextOptions<UserDatabaseContext> dbContextOptions) : base(dbContextOptions)
+    {
+    }
+
     public DbSet<User> Users { get; set; }
 }
\ No newline at end of file
diff --git a/src/Elektrifikatsiya/Elektrifikatsiya/Program.cs b/src/Elektrifikatsiya/Elektrifikatsiya/Program.cs
index d9004c1..fb58465 100644
--- a/src/Elektrifikatsiya/Elektrifikatsiya/Program.cs
+++ b/src/Elektrifikatsiya/Elektrifikatsiya/Program.cs
@@ -2,11 +2,16 @@ using Blazorise;
 using Blazorise.Icons.Material;
 using Blazorise.Material;
 
+using Elektrifikatsiya.Database;
+
+using Microsoft.EntityFrameworkCore;
+
 WebApplicationBuilder builder = WebApplication.CreateBuilder(args);
 
 // Add services to the container.
 builder.Services.AddRazorPages();
 builder.Services.AddServerSideBlazor();
+builder.Services.AddDbContext<UserDatabaseContext>(options => options.UseSqlite("/host/UserDatabase.sqlite"));
 
 AddBlazorise(builder.Services);
 
diff --git a/src/Elektrifikatsiya/Elektrifikatsiya/Services/IAuthenticationService.cs b/src/Elektrifikatsiya/Elektrifikatsiya/Services/IAuthenticationService.cs
index 84b1adf..2ccc8ec 100644
--- a/src/Elektrifikatsiya/Elektrifikatsiya/Services/IAuthenticationService.cs
+++ b/src/Elektrifikatsiya/Elektrifikatsiya/Services/IAuthenticationService.cs
@@ -18,7 +18,7 @@ public interface IAuthenticationService
     /// <param name="email">The E-mail address of the user.</param>
     /// <returns>A <see cref="Task"/> to <see langword="await"/>.</returns>
 
-    Task<Result> RegisterUserAsync(string name, string password);
+    Task<Result> RegisterUserAsync(string name, string password, Role role);
 
     /// <summary>
     /// Logs a user in.
@@ -38,7 +38,7 @@ public interface IAuthenticationService
     /// </summary>
     /// <param name="deletionToken">The deletion token.</param>
     /// <returns>A <see cref="Task"/> to <see langword="await"/> and a <see cref="bool"/> that indicates if the operation was successful.</returns>
-    Task<Result> DeleteUserAsync(string deletionToken);
+    Task<Result> DeleteUserAsync();
 
     /// <summary>
     /// Checks if a user exists.
diff --git a/src/Elektrifikatsiya/Elektrifikatsiya/Services/ICookieService.cs b/src/Elektrifikatsiya/Elektrifikatsiya/Services/ICookieService.cs
new file mode 100644
index 0000000..a954ea8
--- /dev/null
+++ b/src/Elektrifikatsiya/Elektrifikatsiya/Services/ICookieService.cs
@@ -0,0 +1,13 @@
+namespace Elektrifikatsiya.Services;
+
+public interface ICookieService
+{
+    /// <summary>
+    /// Writes a cookie.
+    /// </summary>
+    /// <param name="name">The name of the cookie.</param>
+    /// <param name="value">The value of the cookie.</param>
+    /// <param name="days">Indicates the maximum lifetime of the cookie.</param>
+    /// <returns></returns>
+    Task WriteCookieAsync(string name, string value, int days);
+}
\ No newline at end of file
diff --git a/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/AuthenticationService.cs b/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/AuthenticationService.cs
index 1a3c2ae..36ce68e 100644
--- a/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/AuthenticationService.cs
+++ b/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/AuthenticationService.cs
@@ -1,43 +1,134 @@
-using Elektrifikatsiya.Models;
+using Elektrifikatsiya.Database;
+using Elektrifikatsiya.Models;
+using Elektrifikatsiya.Utilities;
 
 using FluentResults;
 
+using Microsoft.EntityFrameworkCore;
+
+using BC = BCrypt.Net.BCrypt;
+
 namespace Elektrifikatsiya.Services.Implementations;
 
 public class AuthenticationService : IAuthenticationService
 {
-    public Task<Result> DeleteUserAsync(string deletionToken)
+    private readonly UserDatabaseContext userDatabaseContext;
+    private readonly IHttpContextAccessor httpContextAccessor;
+    private readonly ICookieService cookieService;
+
+    public AuthenticationService(UserDatabaseContext userDatabaseContext, IHttpContextAccessor httpContextAccessor, ICookieService cookieService)
     {
-        throw new NotImplementedException();
+        this.userDatabaseContext = userDatabaseContext;
+        this.httpContextAccessor = httpContextAccessor;
+        this.cookieService = cookieService;
     }
 
-    public Task<Result<User>> GetUserAsync()
+    public async Task<Result> DeleteUserAsync()
     {
-        throw new NotImplementedException();
+        Result<User> getUserResult = await GetUserAsync();
+
+        if (getUserResult.IsFailed)
+        {
+            return getUserResult.ToResult();
+        }
+
+        _ = userDatabaseContext.Users.Remove(getUserResult.Value);
+        return (await Result.Try(() => userDatabaseContext.SaveChangesAsync())).ToResult();
     }
 
-    public Task<Result<bool>> IsAuthenticated()
+    public async Task<Result<User>> GetUserAsync()
     {
-        throw new NotImplementedException();
+        string? token = httpContextAccessor.HttpContext?.Request.Cookies["token"]?.ToString();
+
+        if (!TokenGenerator.ValidateToken(token, "auth"))
+        {
+            return Result.Fail("Token is not valid!");
+        }
+
+        User? user = await userDatabaseContext.Users.FirstOrDefaultAsync(u => u.SessionToken == token);
+
+        if (user is null || DateTime.UtcNow - user.LastLoginDate > TimeSpan.FromDays(7))
+        {
+            return Result.Fail("Token is not valid or expired!");
+        }
+
+        return user;
     }
 
-    public Task<Result> LoginUserAsync(string name, string password)
+    public async Task<Result<bool>> IsAuthenticated()
     {
-        throw new NotImplementedException();
+        return (await GetUserAsync()).IsSuccess;
     }
 
-    public Task<Result> LogoutUserAsync()
+    public async Task<Result> LoginUserAsync(string name, string password)
     {
-        throw new NotImplementedException();
+        User? user = await userDatabaseContext.Users.FirstOrDefaultAsync(u => u.Name.Equals(name, StringComparison.InvariantCultureIgnoreCase));
+
+        if (user is null)
+        {
+            return Result.Fail("User does not exist!");
+        }
+
+        if (!BC.Verify(password, user.PasswordHash))
+        {
+            return Result.Fail("Invalid credentials!");
+        }
+
+        string newToken = TokenGenerator.GenerateToken("auth", user.Id);
+
+        user.LastLoginDate = DateTime.UtcNow;
+        user.SessionToken = newToken;
+
+        _ = await userDatabaseContext.SaveChangesAsync();
+
+        await cookieService.WriteCookieAsync("token", newToken, 7);
+
+        return Result.Ok();
     }
 
-    public Task<Result> RegisterUserAsync(string name, string password)
+    public async Task<Result> LogoutUserAsync()
     {
-        throw new NotImplementedException();
+        string? token = httpContextAccessor.HttpContext?.Request.Cookies["token"]?.ToString();
+
+        await cookieService.WriteCookieAsync("token", string.Empty, 0);
+
+        if (!TokenGenerator.ValidateToken(token, "auth"))
+        {
+            return Result.Ok();
+        }
+
+        User? user = await userDatabaseContext.Users.FirstOrDefaultAsync(u => u.SessionToken == token);
+
+        if (user is null)
+        {
+            return Result.Ok();
+        }
+
+        user.SessionToken = null;
+
+        _ = await userDatabaseContext.SaveChangesAsync();
+
+        return Result.Ok();
+    }
+
+    public async Task<Result> RegisterUserAsync(string name, string password, Role role)
+    {
+        Result<bool> userExistsResult = await UserExistsAsync(name);
+
+        if (userExistsResult.IsFailed || userExistsResult.Value)
+        {
+            return Result.Fail("User name already exists!");
+        }
+
+        User user = new User(name, BC.HashPassword(password), role);
+        _ = userDatabaseContext.Users.Add(user);
+
+        return (await Result.Try(() => userDatabaseContext.SaveChangesAsync())).ToResult();
     }
 
     public Task<Result<bool>> UserExistsAsync(string name)
     {
-        throw new NotImplementedException();
+        return Result.Try(() =>
+            userDatabaseContext.Users.AnyAsync(u => u.Name.Equals(name, StringComparison.InvariantCultureIgnoreCase)));
     }
 }
\ No newline at end of file
diff --git a/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/AuthorizationService.cs b/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/AuthorizationService.cs
index 3a2f4c4..e62b137 100644
--- a/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/AuthorizationService.cs
+++ b/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/AuthorizationService.cs
@@ -23,7 +23,7 @@ public class AuthorizationService : IAuthorizationService
         }
         else
         {
-            return Result.Fail("Use doesn't have the required role!");
+            return Result.Fail("User doesn't have the required role!");
         }
     }
 }
\ No newline at end of file
diff --git a/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/CookieService.cs b/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/CookieService.cs
new file mode 100644
index 0000000..d654fdc
--- /dev/null
+++ b/src/Elektrifikatsiya/Elektrifikatsiya/Services/Implementations/CookieService.cs
@@ -0,0 +1,18 @@
+using Microsoft.JSInterop;
+
+namespace Elektrifikatsiya.Services.Implementations;
+
+public class CookieService : ICookieService
+{
+    private readonly IJSRuntime jsRuntime;
+
+    public CookieService(IJSRuntime jsRuntime)
+    {
+        this.jsRuntime = jsRuntime;
+    }
+
+    public async Task WriteCookieAsync(string name, string value, int days)
+    {
+        _ = await jsRuntime.InvokeAsync<string>("blazorExtensions.WriteCookie", name, value, days);
+    }
+}
\ No newline at end of file
diff --git a/src/Elektrifikatsiya/Elektrifikatsiya/Utilities/SecureStringGenerator.cs b/src/Elektrifikatsiya/Elektrifikatsiya/Utilities/SecureStringGenerator.cs
new file mode 100644
index 0000000..a37cb29
--- /dev/null
+++ b/src/Elektrifikatsiya/Elektrifikatsiya/Utilities/SecureStringGenerator.cs
@@ -0,0 +1,20 @@
+using System.Security.Cryptography;
+
+namespace Elektrifikatsiya.Utilities;
+
+public static class SecureStringGenerator
+{
+    public static string CreateCryptographicRandomString(int count)
+    {
+        return Convert.ToBase64String(RandomNumberGenerator.GetBytes(count));
+    }
+
+    public static string CreateCryptographicRandomString(int count, int uid)
+    {
+        List<byte> bytes = RandomNumberGenerator.GetBytes(count).ToList();
+
+        bytes.AddRange(BitConverter.GetBytes(uid));
+
+        return Convert.ToBase64String(bytes.ToArray());
+    }
+}
\ No newline at end of file
diff --git a/src/Elektrifikatsiya/Elektrifikatsiya/Utilities/TokenGenerator.cs b/src/Elektrifikatsiya/Elektrifikatsiya/Utilities/TokenGenerator.cs
new file mode 100644
index 0000000..99faf60
--- /dev/null
+++ b/src/Elektrifikatsiya/Elektrifikatsiya/Utilities/TokenGenerator.cs
@@ -0,0 +1,19 @@
+namespace Elektrifikatsiya.Utilities;
+
+public static class TokenGenerator
+{
+    public static string GenerateToken(string tokenType, int uid = 0, int length = 128)
+    {
+        return tokenType + "-" + SecureStringGenerator.CreateCryptographicRandomString(length, uid);
+    }
+
+    public static bool ValidateToken(string? token, string tokenType)
+    {
+        if (token is null)
+        {
+            return false;
+        }
+
+        return token.StartsWith(tokenType + "-");
+    }
+}
\ No newline at end of file