diff --git a/src/controllers/user.controller.ts b/src/controllers/user.controller.ts
index 1855b92..7c3eb71 100644
--- a/src/controllers/user.controller.ts
+++ b/src/controllers/user.controller.ts
@@ -11,8 +11,6 @@ import { LogService } from "../services/log.service";
 
 
 class UserController extends BaseController {
-    private Service = new UserService(UserModel)
-    private LogService = new LogService()
     public readonly router = Router()
 
     constructor() {
@@ -24,6 +22,9 @@ class UserController extends BaseController {
         }
     }
 
+    private Service = new UserService(UserModel, this.getApplicationSecret())
+    private LogService = new LogService()
+
     private loadRoutes() {
         this.router.get('/', Guard, this.getAll)
         this.router.get('/:id', Guard, this.getById)
diff --git a/src/services/index.ts b/src/services/index.ts
index ae31f2f..02be2f8 100644
--- a/src/services/index.ts
+++ b/src/services/index.ts
@@ -1 +1 @@
-export { Environment as EnvironmentService } from "./evironment.service";
+export { Environment as EnvironmentService } from "./environment.service";
diff --git a/src/services/user.service.spec.ts b/src/services/user.service.spec.ts
index 172a78e..dc98e5e 100644
--- a/src/services/user.service.spec.ts
+++ b/src/services/user.service.spec.ts
@@ -11,7 +11,7 @@ let UserModel = {
     findOne: jest.fn()
 } as unknown as ModelCtor<Model<any, any>>
 
-const service = new UserService(UserModel)
+const service = new UserService(UserModel, 'key')
 
 const hash = '$2b$10$1Q6Zz1'
 
diff --git a/src/services/user.service.ts b/src/services/user.service.ts
index 11d8847..f72521a 100644
--- a/src/services/user.service.ts
+++ b/src/services/user.service.ts
@@ -5,28 +5,27 @@ import { User, UserModel } from "../models";
 import { searchEntity } from "../utils/searchEntity";
 import * as bcrypt from 'bcrypt'
 import { LegendHttpError } from "../web/errors";
-import jwt from 'jsonwebtoken'
+import { Auth as AuthService } from "./auth.service";
 
 
 class UserService {
-    constructor(private readonly userModel: typeof UserModel) {}
+    constructor(private readonly userModel: typeof UserModel, private readonly applicationSecret: string = '') {}
 
     async signIn(signInDto: SignInDto): Promise<string> {
         const user = await searchEntity<User>(this.userModel, { username: signInDto.username }, false, false)
 
-        if (user === null) {
-            throw new LegendHttpError(401, 'User or password invalid.')
-        }
-
-        const isPasswordMatch = await bcrypt.compare(signInDto.password, user.password)
+        const isPasswordMatch = await bcrypt.compare(
+            signInDto.password,
+            user?.password || ''
+        )
 
-        if (!isPasswordMatch) {
+        if ((user === null) || !isPasswordMatch) {
             throw new LegendHttpError(401, 'User or password invalid.')
         }
 
-        const token = await jwt.sign({ id: user.id, username: user.username }, process.env.JWT_SECRET, {
-            expiresIn: '20min'
-        })
+        const auth = new AuthService(user, this.applicationSecret)
+
+        const token = auth.signToken()
 
         return token
     }