diff --git a/Gemfile b/Gemfile
index 463e5c3..390be6e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -29,6 +29,7 @@ group :development do
   gem 'better_errors'
   gem 'quiet_assets'
   gem 'metric_fu'
+  gem 'binding_of_caller'
 end
 
 group :development, :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index 391d20f..ac3e8b6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -52,6 +52,8 @@ GEM
       coderay (>= 1.0.0)
       erubis (>= 2.6.6)
       rack (>= 0.9.0)
+    binding_of_caller (0.7.2)
+      debug_inspector (>= 0.0.1)
     bootstrap-sass (3.3.5.1)
       autoprefixer-rails (>= 5.0.0.1)
       sass (>= 3.3.0)
@@ -95,6 +97,7 @@ GEM
       adamantium (~> 0.2.0)
       equalizer (~> 0.0.9)
     database_cleaner (1.4.1)
+    debug_inspector (0.0.2)
     diff-lcs (1.2.5)
     docile (1.1.5)
     domain_name (0.5.24)
@@ -361,6 +364,7 @@ PLATFORMS
 DEPENDENCIES
   bcrypt
   better_errors
+  binding_of_caller
   bootstrap-sass
   bullet
   capybara
diff --git a/app/assets/javascripts/tests.coffee b/app/assets/javascripts/tests.coffee
new file mode 100644
index 0000000..24f83d1
--- /dev/null
+++ b/app/assets/javascripts/tests.coffee
@@ -0,0 +1,3 @@
+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://coffeescript.org/
diff --git a/app/assets/javascripts/user_sessions.coffee b/app/assets/javascripts/user_sessions.coffee
new file mode 100644
index 0000000..24f83d1
--- /dev/null
+++ b/app/assets/javascripts/user_sessions.coffee
@@ -0,0 +1,3 @@
+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://coffeescript.org/
diff --git a/app/assets/stylesheets/tests.scss b/app/assets/stylesheets/tests.scss
new file mode 100644
index 0000000..7e46f05
--- /dev/null
+++ b/app/assets/stylesheets/tests.scss
@@ -0,0 +1,3 @@
+// Place all the styles related to the Tests controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/
diff --git a/app/assets/stylesheets/user_sessions.scss b/app/assets/stylesheets/user_sessions.scss
new file mode 100644
index 0000000..69017e2
--- /dev/null
+++ b/app/assets/stylesheets/user_sessions.scss
@@ -0,0 +1,3 @@
+// Place all the styles related to the UserSessions controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index d83690e..32e77eb 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -1,5 +1,21 @@
 class ApplicationController < ActionController::Base
-  # Prevent CSRF attacks by raising an exception.
-  # For APIs, you may want to use :null_session instead.
   protect_from_forgery with: :exception
+
+  helper_method :current_user
+  helper_method :current_session
+  helper_method :logged_in?
+
+  private
+
+  def current_user
+    @current_user ||= User.find(current_session[:user_id]) if current_session
+  end
+
+  def current_session
+    @current_session ||= UserSession.authenticate(cookies[:user_session])
+  end
+
+  def logged_in?
+    !!current_user
+  end
 end
diff --git a/app/controllers/tests_controller.rb b/app/controllers/tests_controller.rb
new file mode 100644
index 0000000..4faf46f
--- /dev/null
+++ b/app/controllers/tests_controller.rb
@@ -0,0 +1,7 @@
+class TestsController < ApplicationController
+  def index
+  end
+
+  def show
+  end
+end
diff --git a/app/controllers/user_sessions_controller.rb b/app/controllers/user_sessions_controller.rb
new file mode 100644
index 0000000..90a3384
--- /dev/null
+++ b/app/controllers/user_sessions_controller.rb
@@ -0,0 +1,42 @@
+class UserSessionsController < ApplicationController
+  def new
+    @user_session = UserSession.new
+  end
+
+  def create
+    @user_session = UserSession.new(user_session_params)
+
+    user = User.find_by_username(params[:user_session][:username])
+
+    if authenticate_user?(user)
+      create_user_session(user)
+
+      redirect_to root_path
+    else
+      render :new
+    end
+  end
+
+  def destroy
+    cookies.permanent[:user_session] = nil
+    current_session.destroy if current_session
+
+    redirect_to root_path
+  end
+
+  private
+
+  def user_session_params
+    params.require(:user_session).permit(:username, :password)
+  end
+
+  def authenticate_user?(user)
+    user && user.authenticate(params[:user_session][:password])
+  end
+
+  def create_user_session(user)
+    user_session = UserSession.new_by_user(user, request.env)
+
+    cookies.permanent[:user_session] = user_session.key
+  end
+end
diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
index f072718..2058216 100644
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -7,7 +7,7 @@ class UsersController < ApplicationController
     @user = User.new(user_params)
 
     if @user.save
-      render :create
+      redirect_to signin_path
     else
       render :new
     end
diff --git a/app/models/user_session.rb b/app/models/user_session.rb
new file mode 100644
index 0000000..a8ab134
--- /dev/null
+++ b/app/models/user_session.rb
@@ -0,0 +1,27 @@
+class UserSession < ActiveRecord::Base
+  belongs_to :user
+
+  before_validation :set_unique_key
+
+  attr_accessor :username, :password
+
+  def self.authenticate(key)
+    self.find_by_key(key)
+  end
+
+  def self.new_by_user(user, env)
+    user_session = UserSession.new(
+      user: user,
+      user_agent: env['HTTP_USER_AGENT'],
+      ip: env['REMOTE_ADDR']
+    )
+    user_session.save
+    user_session
+  end
+
+  private
+
+  def set_unique_key
+    self.key = SecureRandom.urlsafe_base64(32)
+  end
+end
diff --git a/app/views/application/_navbar.html.slim b/app/views/application/_navbar.html.slim
index 9a2531a..9a52d66 100644
--- a/app/views/application/_navbar.html.slim
+++ b/app/views/application/_navbar.html.slim
@@ -9,5 +9,9 @@
       = link_to 'Creddit', root_path, class: 'navbar-brand'
     .collapse.navbar-collapse
           ul.nav.navbar-nav.navbar-right
-            li= link_to 'Create Account', new_user_path
+            - if logged_in?
+              li= link_to 'Sign Out', signout_path
+            - else
+              li= link_to 'Create Account', signup_path
+              li= link_to 'Sign In', signin_path
 
diff --git a/app/views/tests/index.html.slim b/app/views/tests/index.html.slim
new file mode 100644
index 0000000..0f02584
--- /dev/null
+++ b/app/views/tests/index.html.slim
@@ -0,0 +1 @@
+= 'tests#index'
diff --git a/app/views/tests/show.html.slim b/app/views/tests/show.html.slim
new file mode 100644
index 0000000..9606ca0
--- /dev/null
+++ b/app/views/tests/show.html.slim
@@ -0,0 +1 @@
+= 'tests#show'
diff --git a/app/views/user_sessions/create.html.slim b/app/views/user_sessions/create.html.slim
new file mode 100644
index 0000000..e69de29
diff --git a/app/views/user_sessions/new.html.slim b/app/views/user_sessions/new.html.slim
new file mode 100644
index 0000000..f0c833b
--- /dev/null
+++ b/app/views/user_sessions/new.html.slim
@@ -0,0 +1,6 @@
+= simple_form_for @user_session do |f|
+  .form-inputs
+    = f.input :username
+    = f.input :password
+  .form-actions
+    = f.button :submit
diff --git a/config/routes.rb b/config/routes.rb
index 0b5bce2..de7e608 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -1,5 +1,12 @@
 Rails.application.routes.draw do
-  resources :users, only: [:new, :create]
+  resources :tests, only: [:index, :show]
 
-  root to: 'users#new'
+  get 'signup', to: 'users#new', as: :signup
+  get 'signin', to: 'user_sessions#new', as: :signin
+  get 'signout', to: 'user_sessions#destroy', as: :signout
+
+  resources :users, only: [:new, :create]
+  resources :user_sessions, only: [:new, :create, :destroy]
+
+  root to: 'tests#index'
 end
diff --git a/db/migrate/20150710040354_create_user_sessions.rb b/db/migrate/20150710040354_create_user_sessions.rb
new file mode 100644
index 0000000..4e1eae4
--- /dev/null
+++ b/db/migrate/20150710040354_create_user_sessions.rb
@@ -0,0 +1,13 @@
+class CreateUserSessions < ActiveRecord::Migration
+  def change
+    create_table :user_sessions do |t|
+      t.references :user, index: true, foreign_key: true
+      t.string :key
+      t.string :user_agent
+      t.string :ip
+      t.datetime :accessed_at
+
+      t.timestamps null: false
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 0f9d4cc..ec23418 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,19 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20150708191201) do
+ActiveRecord::Schema.define(version: 20150710040354) do
+
+  create_table "user_sessions", force: :cascade do |t|
+    t.integer  "user_id"
+    t.string   "key"
+    t.string   "user_agent"
+    t.string   "ip"
+    t.datetime "accessed_at"
+    t.datetime "created_at",  null: false
+    t.datetime "updated_at",  null: false
+  end
+
+  add_index "user_sessions", ["user_id"], name: "index_user_sessions_on_user_id"
 
   create_table "users", force: :cascade do |t|
     t.string   "username"
diff --git a/spec/controllers/application_controller_spec.rb b/spec/controllers/application_controller_spec.rb
new file mode 100644
index 0000000..d12643c
--- /dev/null
+++ b/spec/controllers/application_controller_spec.rb
@@ -0,0 +1,54 @@
+require 'rails_helper'
+
+describe ApplicationController, type: :controller do
+  let!(:user) { create(:user) }
+  let!(:user_session) { create(:user_session, user: user) }
+
+  describe '#logged_in?' do
+    context 'when logged in' do
+      before(:each) { request.cookies['user_session'] = user_session.key }
+
+      it 'should return true' do
+        expect(controller.send(:logged_in?)).to be(true)
+      end
+    end
+
+    context 'when not logged in' do
+      it 'should return false' do
+        expect(controller.send(:logged_in?)).to be(false)
+      end
+    end
+  end
+
+  describe '#current_user' do
+    context 'when logged in' do
+      before(:each) { request.cookies['user_session'] = user_session.key }
+
+      it 'should return the current user' do
+        expect(controller.send(:current_user)).to eq(user)
+      end
+    end
+
+    context 'when not logged in' do
+      it 'should return nil' do
+        expect(controller.send(:current_user)).to be_nil
+      end
+    end
+  end
+
+  describe '#current_session' do
+    context 'when logged in' do
+      before(:each) { request.cookies['user_session'] = user_session.key }
+
+      it 'should return the curren session' do
+        expect(controller.send(:current_session)).to eq(user_session)
+      end
+    end
+
+    context 'when not logged in' do
+      it 'should return nil' do
+        expect(controller.send(:current_session)).to be_nil
+      end
+    end
+  end
+end
diff --git a/spec/controllers/user_sessions_controller_spec.rb b/spec/controllers/user_sessions_controller_spec.rb
new file mode 100644
index 0000000..deaa1e9
--- /dev/null
+++ b/spec/controllers/user_sessions_controller_spec.rb
@@ -0,0 +1,109 @@
+require 'rails_helper'
+
+describe UserSessionsController, type: :controller do
+  describe '#new' do
+    it 'should render :new' do
+      get :new
+
+      expect(response).to render_template(:new)
+    end
+
+    it 'should set a new Session to @session' do
+      get :new
+
+      expect(assigns(:user_session)).to be_a_new(UserSession)
+    end
+  end
+
+  describe '#create' do
+    let!(:user) { create(:user) }
+    let(:data) do
+      {
+        username: user.username,
+        password: user.password
+      }
+    end
+
+    context 'with valid credentials' do
+      it 'should create a user session' do
+        expect do
+          post :create,  user_session: data
+        end.to change(UserSession, :count).by(1)
+      end
+
+      it 'should create a correct user_session cookie' do
+        post :create, user_session: data
+
+        expect(response.cookies['user_session']).to eq(UserSession.first.key)
+      end
+
+      it 'should redirect to the home page' do
+        post :create, user_session: data
+
+        expect(response).to redirect_to(root_path)
+      end
+    end
+
+    context 'with invalid credentials' do
+      it 'should not create a user session with a blank username' do
+        data['username'] = ''
+
+        expect do
+          post :create, user_session: data
+        end.to change(UserSession, :count).by(0)
+      end
+
+      it 'should not create a user session invalid credentials' do
+        data['password'] = 'badpassword'
+
+        expect do
+          post :create, user_session: data
+        end.to change(UserSession, :count).by(0)
+      end
+
+      it 'should render :new' do
+        data['username'] = ''
+
+        post :create, user_session: data
+
+        expect(response).to render_template(:new)
+      end
+    end
+  end
+
+  describe '#delete' do
+    let!(:user) { create(:user) }
+    let(:data) do
+      {
+        username: user.username,
+        password: user.password
+      }
+    end
+
+    context 'with a valid session' do
+      let(:user_session) { create(:user_session) }
+
+      it 'should delete the user_session cookie' do
+        request.cookies['user_session'] = user_session.key
+
+        delete :destroy
+
+        expect(response.cookies['user_session']).to be_nil
+      end
+
+      it 'should delete the UserSession' do
+        request.cookies['user_session'] = user_session.key
+        allow_any_instance_of(ApplicationController)
+          .to receive(:current_session).and_return(user_session)
+
+        expect { delete :destroy }.to change(UserSession, :count).by(-1)
+      end
+
+      it 'should redirect to the root' do
+        delete :destroy
+
+        expect(response).to redirect_to(root_path)
+      end
+    end
+  end
+end
diff --git a/spec/controllers/users_controller_spec.rb b/spec/controllers/users_controller_spec.rb
index fc922c2..9182884 100644
--- a/spec/controllers/users_controller_spec.rb
+++ b/spec/controllers/users_controller_spec.rb
@@ -29,7 +29,11 @@ describe UsersController, type: :controller do
         expect { post :create, user: data }.to change(User, :count).by(1)
       end
 
-      it 'should redirect to the login page'
+      it 'should redirect to the login page' do
+        post :create, user: data
+
+        expect(response).to redirect_to signin_path
+      end
     end
 
     context 'with invalid data' do
diff --git a/spec/factories/user_factory.rb b/spec/factories/user_factory.rb
index a10dea6..ee760d9 100644
--- a/spec/factories/user_factory.rb
+++ b/spec/factories/user_factory.rb
@@ -1,4 +1,3 @@
-
 FactoryGirl.define do
   factory :user do
     username { Faker::Internet.user_name }
diff --git a/spec/factories/user_session_factory.rb b/spec/factories/user_session_factory.rb
new file mode 100644
index 0000000..71479b4
--- /dev/null
+++ b/spec/factories/user_session_factory.rb
@@ -0,0 +1,7 @@
+FactoryGirl.define do
+  factory :user_session do
+    user
+    user_agent { Faker::Lorem.sentence }
+    ip { Faker::Internet.ip_v4_address }
+  end
+end
diff --git a/spec/models/user_session_spec.rb b/spec/models/user_session_spec.rb
new file mode 100644
index 0000000..d293091
--- /dev/null
+++ b/spec/models/user_session_spec.rb
@@ -0,0 +1,52 @@
+require 'rails_helper'
+
+RSpec.describe UserSession, type: :model do
+  describe '.active' do
+    context 'with valid session' do
+      let(:user_session) { create(:user_session) }
+
+      context 'with correct key' do
+        it 'should find the correct session' do
+          expect(UserSession.authenticate(user_session.key)).to eq(user_session)
+        end
+      end
+
+      context 'with invalid key' do
+        it 'should not find a session' do
+          expect(UserSession.authenticate('aaaaaa')).to be_nil
+        end
+      end
+    end
+  end
+
+  describe '.new_by_user' do
+    let(:user) { build(:user) }
+    let(:env) do
+      {
+        'HTTP_USER_AGENT': 'Test User Agent',
+        'REMOTE_ADDR': '192.168.1.1'
+      }
+    end
+
+    context 'with valid user and environment' do
+      let(:user_session) { UserSession.new_by_user(user, env) }
+
+      it 'should create a new session' do
+        # duplicated user_session creation for simplecov's benefit
+        expect(UserSession.new_by_user(user, env)).to be_a(UserSession)
+      end
+
+      it 'should set the correct user' do
+        expect(user_session.user).to eq(user)
+      end
+
+      it 'should set the correct user agent' do
+        expect(user_session.user_agent).to eq(env['HTTP_USER_AGENT'])
+      end
+
+      it 'should set the correct IP address' do
+        expect(user_session.ip).to eq(env['REMOTE_ADDR'])
+      end
+    end
+  end
+end
diff --git a/spec/support/simplecov.rb b/spec/support/simplecov.rb
index 58409cb..690d478 100644
--- a/spec/support/simplecov.rb
+++ b/spec/support/simplecov.rb
@@ -2,4 +2,8 @@ SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter[
   SimpleCov::Formatter::HTMLFormatter,
   SimpleCov::Formatter::MetricFu
 ]
-SimpleCov.start
+SimpleCov.start do
+  add_filter 'spec/'
+  add_filter 'config/'
+  add_filter 'vendor/'
+end