diff --git a/staff/marti-herms/project/V-HUB/com/errors.js b/staff/marti-herms/project/V-HUB/com/errors.js
index d4e54a279..18989e4e9 100644
--- a/staff/marti-herms/project/V-HUB/com/errors.js
+++ b/staff/marti-herms/project/V-HUB/com/errors.js
@@ -22,10 +22,28 @@ class DuplicityError extends Error {
     }
 }
 
+class NotFoundError extends Error {
+    constructor(message) {
+        super(message)
+
+        this.name = this.constructor.name
+    }
+}
+
+class CredentialsError extends Error {
+    constructor(message) {
+        super(message)
+
+        this.name = this.constructor.name
+    }
+}
+
 const errors = {
     ValidationError,
     SystemError,
-    DuplicityError
+    DuplicityError,
+    NotFoundError,
+    CredentialsError
 }
 
 export default errors
\ No newline at end of file
diff --git a/staff/marti-herms/project/V-HUB/core/logic/authenticateUser.js b/staff/marti-herms/project/V-HUB/core/logic/authenticateUser.js
index e69de29bb..c2150e945 100644
--- a/staff/marti-herms/project/V-HUB/core/logic/authenticateUser.js
+++ b/staff/marti-herms/project/V-HUB/core/logic/authenticateUser.js
@@ -0,0 +1,26 @@
+import bcrypt from 'bcryptjs'
+
+import { User } from '../data/models.js'
+
+import { validate, errors } from 'com'
+
+const { NotFoundError, CredentialsError, SystemError } = errors
+
+export default (username, password) => {
+    validate.username(username)
+    validate.password(password)
+
+    return User.findOne({ username }).lean()
+        .catch(error => { throw new SystemError(error.message) })
+        .then(user => {
+            if (!user) throw new NotFoundError('user not found')
+
+            return bcrypt.compare(password, user.password)
+                .catch(error => { throw new SystemError(error.message) })
+                .then(match => {
+                    if (!match) throw new CredentialsError('wrong password')
+
+                    return user._id.toString()
+                })
+        })
+}
\ No newline at end of file
diff --git a/staff/marti-herms/project/V-HUB/core/logic/authenticateUser.spec.js b/staff/marti-herms/project/V-HUB/core/logic/authenticateUser.spec.js
new file mode 100644
index 000000000..33fb82ca3
--- /dev/null
+++ b/staff/marti-herms/project/V-HUB/core/logic/authenticateUser.spec.js
@@ -0,0 +1,125 @@
+import 'dotenv/config'
+import mongoose from 'mongoose'
+import { expect } from 'chai'
+import bcrypt from 'bcryptjs'
+
+import authenticateUser from './authenticateUser.js'
+import { User } from '../data/models.js'
+
+import { errors } from 'com'
+
+const { NotFoundError, CredentialsError, ValidationError } = errors
+
+describe('authenticateUser', () => {
+    before(() => mongoose.connect(process.env.MONGODB_URI))
+
+    beforeEach(() => User.deleteMany())
+
+    it('succeeds on existing user and correct password', () =>
+        bcrypt.hash('123123123', 8)
+            .then(hash => {
+                return User.create({ username: 'monoloco', email: 'mono@loco.com', password: hash, role: false })
+                    .then(user => {
+                        return authenticateUser('monoloco', '123123123')
+                            .then(id => expect(id).to.equal(user.id))
+                    })
+            })
+    )
+
+    it('fails on non-existing user', () => {
+        let error
+
+        authenticateUser('monoloco', '123123123')
+            .catch(_error => error = _error)
+            .finally(() => {
+                expect(error).to.be.instanceOf(NotFoundError)
+                expect(error.message).to.equal('user not found')
+            })
+    })
+
+
+    it('fails on wrong password', () => {
+        let error
+
+        return bcrypt.hash('123123123', 8)
+            .then(hash =>
+                User.create({ name: 'Mono', surname: 'Loco', email: 'mono@loco.com', username: 'monoloco', password: hash })
+            )
+            .then(() => authenticateUser('monoloco', '111111111'))
+            .catch(_error => error = _error)
+            .finally(() => {
+                expect(error).to.be.instanceOf(CredentialsError)
+                expect(error.message).to.equal('wrong password')
+            })
+
+    })
+
+    it('fails on non-string username', () => {
+        let error
+
+        try {
+            authenticateUser(123, '123123123')
+        } catch (_error) {
+            error = _error
+        } finally {
+            expect(error).to.be.instanceOf(ValidationError)
+            expect(error.message).to.equal('username is not a string')
+        }
+    })
+
+    it('fails on invalid username', () => {
+        let error
+
+        try {
+            authenticateUser('', '123123123')
+        } catch (_error) {
+            error = _error
+        } finally {
+            expect(error).to.be.instanceOf(ValidationError)
+            expect(error.message).to.equal('invalid username')
+        }
+    })
+
+    it('fails on non-string password', () => {
+        let error
+
+        try {
+            authenticateUser('monoloco', 123)
+        } catch (_error) {
+            error = _error
+        } finally {
+            expect(error).to.be.instanceOf(ValidationError)
+            expect(error.message).to.equal('password is not a string')
+        }
+    })
+
+    it('fails on password short', () => {
+        let error
+
+        try {
+            authenticateUser('monoloco', '132')
+        } catch (_error) {
+            error = _error
+        } finally {
+            expect(error).to.be.instanceOf(ValidationError)
+            expect(error.message).to.equal('password length is lower than 8 characters')
+        }
+    })
+
+    it('fails on password with spaces', () => {
+        let error
+
+        try {
+            authenticateUser('monoloco', '123 123132')
+        } catch (_error) {
+            error = _error
+        } finally {
+            expect(error).to.be.instanceOf(ValidationError)
+            expect(error.message).to.equal('password has empty spaces')
+        }
+    })
+
+    afterEach(() => User.deleteMany())
+
+    after(() => mongoose.disconnect())
+})
\ No newline at end of file
diff --git a/staff/marti-herms/project/V-HUB/core/logic/authenticateUser.test.js b/staff/marti-herms/project/V-HUB/core/logic/authenticateUser.test.js
new file mode 100644
index 000000000..52024c2b2
--- /dev/null
+++ b/staff/marti-herms/project/V-HUB/core/logic/authenticateUser.test.js
@@ -0,0 +1,16 @@
+import 'dotenv/config'
+import bcrypt from 'bcryptjs'
+
+import authenticateUser from './authenticateUser.js'
+
+import { User } from '../data/models.js'
+
+import mongoose from 'mongoose'
+
+mongoose.connect(process.env.MONGODB_URI)
+    .then(() => bcrypt.hash('123123123', 8))
+    .then(hash => User.create({ username: 'eden', email: 'marti@herms.com', password: hash }))
+    .then(() => authenticateUser('eden', '123123123'))
+    .then(userId => console.log('user authenticated', userId))
+    .catch(error => console.error(error))
+    .finally(() => mongoose.disconnect())
\ No newline at end of file