diff --git a/Gemfile b/Gemfile
index cacd2f1..9248f9f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -14,6 +14,7 @@ gem 'rails_admin'
 gem 'redcarpet'
 gem 'erubis'
 gem 'rack-attack'
+gem 'openid_connect', '~> 1.1', '>= 1.1.8'
 
 group :development, :test do
   gem 'rspec-rails', '4.0.0.beta3'
@@ -38,4 +39,3 @@ group :test do
   gem 'rails-controller-testing'
   gem 'simplecov', require: false
 end
-
diff --git a/Gemfile.lock b/Gemfile.lock
index 411dd6a..18e5d6e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -64,7 +64,10 @@ GEM
       activerecord (>= 5.0, < 6.1)
     addressable (2.7.0)
       public_suffix (>= 2.0.2, < 5.0)
+    aes_key_wrap (1.0.1)
+    attr_required (1.0.1)
     backports (3.15.0)
+    bindata (2.4.6)
     bindex (0.8.1)
     builder (3.2.4)
     byebug (11.1.1)
@@ -124,6 +127,7 @@ GEM
     haml (5.1.2)
       temple (>= 0.8.0)
       tilt
+    httpclient (2.8.3)
     i18n (1.8.2)
       concurrent-ruby (~> 1.0)
     jquery-rails (4.3.5)
@@ -133,6 +137,10 @@ GEM
     jquery-ui-rails (6.0.1)
       railties (>= 3.2.16)
     json (2.3.0)
+    json-jwt (1.11.0)
+      activesupport (>= 4.2)
+      aes_key_wrap
+      bindata
     kaminari (1.1.1)
       activesupport (>= 4.1.0)
       kaminari-actionview (= 1.1.1)
@@ -169,6 +177,16 @@ GEM
     nio4r (2.5.2)
     nokogiri (1.10.8)
       mini_portile2 (~> 2.4.0)
+    openid_connect (1.1.8)
+      activemodel
+      attr_required (>= 1.0.0)
+      json-jwt (>= 1.5.0)
+      rack-oauth2 (>= 1.6.1)
+      swd (>= 1.0.0)
+      tzinfo
+      validate_email
+      validate_url
+      webfinger (>= 1.0.1)
     pg (1.2.2)
     public_suffix (4.0.2)
     puma (4.3.3)
@@ -176,6 +194,12 @@ GEM
     rack (2.0.8)
     rack-attack (6.2.2)
       rack (>= 1.0, < 3)
+    rack-oauth2 (1.10.1)
+      activesupport
+      attr_required
+      httpclient
+      json-jwt (>= 1.11.0)
+      rack
     rack-pjax (1.1.0)
       nokogiri (~> 1.5)
       rack (>= 1.1)
@@ -276,6 +300,10 @@ GEM
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
+    swd (1.1.2)
+      activesupport (>= 3)
+      attr_required (>= 0.0.5)
+      httpclient (>= 2.4)
     temple (0.8.2)
     thor (1.0.1)
     thread_safe (0.3.6)
@@ -287,11 +315,20 @@ GEM
       thread_safe (~> 0.1)
     uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)
+    validate_email (0.1.6)
+      activemodel (>= 3.0)
+      mail (>= 2.2.5)
+    validate_url (1.0.8)
+      activemodel (>= 3.0.0)
+      public_suffix
     web-console (3.7.0)
       actionview (>= 5.0)
       activemodel (>= 5.0)
       bindex (>= 0.4.0)
       railties (>= 5.0)
+    webfinger (1.1.0)
+      activesupport
+      httpclient (>= 2.4)
     websocket-driver (0.7.1)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.4)
@@ -313,6 +350,7 @@ DEPENDENCIES
   faker
   jquery-rails
   listen
+  openid_connect (~> 1.1, >= 1.1.8)
   pg (= 1.2.2)
   puma
   rack-attack
diff --git a/app/controllers/session_controller.rb b/app/controllers/session_controller.rb
new file mode 100644
index 0000000..26e00ab
--- /dev/null
+++ b/app/controllers/session_controller.rb
@@ -0,0 +1,45 @@
+
+class SessionController < ApplicationController
+
+  def authenticate
+    config = OpenIDConnect::Discovery::Provider::Config.discover! "https://did.app"
+
+    client = OpenIDConnect::Client.new({
+      identifier: ENV["CLIENT_ID"],
+      secret: ENV["CLIENT_SECRET"],
+      redirect_uri: "http://localhost:3000/session/callback",
+      issuer: config.issuer,
+      authorization_endpoint: config.authorization_endpoint,
+      jwks_uri: config.jwks_uri,
+      token_endpoint: config.token_endpoint,
+    })
+    redirect_to client.authorization_uri()
+  end
+
+  def callback
+    config = OpenIDConnect::Discovery::Provider::Config.discover! "https://did.app"
+
+    client = OpenIDConnect::Client.new({
+      identifier: ENV["CLIENT_ID"],
+      secret: ENV["CLIENT_SECRET"],
+      redirect_uri: "http://localhost:3000/session/callback",
+      issuer: config.issuer,
+      authorization_endpoint: config.authorization_endpoint,
+      jwks_uri: config.jwks_uri,
+      token_endpoint: config.token_endpoint,
+    })
+    code = params["code"]
+    client.authorization_code = code
+    tokens = client.access_token!
+
+    id_token = OpenIDConnect::ResponseObject::IdToken.decode tokens.id_token, config.jwks
+    id_token.verify!(issuer: config.issuer, client_id: client.identifier)
+    session[:current_user_id] = id_token.subject
+    redirect_to root_path
+  end
+  def terminate
+    session[:current_user_id] = nil
+    redirect_to root_path
+  end
+
+end
diff --git a/app/views/layouts/application.html.erb b/app/views/layouts/application.html.erb
index 34428ac..d12e50b 100644
--- a/app/views/layouts/application.html.erb
+++ b/app/views/layouts/application.html.erb
@@ -24,6 +24,12 @@
             <li><%= link_to 'Speakers', speakers_path %></li>
             <li><%= link_to 'Proposals', proposals_path %></li>
             <li><%= link_to 'Events', events_path %></li>
+            <% if session[:current_user_id] %>
+            <li><%= session[:current_user_id] %></li>
+            <li><%= link_to 'Sign out', sign_out_path %></li>
+            <% else %>
+            <li><%= link_to 'Sign in', sign_in_path %></li>
+            <% end %>
           </div>
         </ul>
       </div>
diff --git a/config/routes.rb b/config/routes.rb
index 9167da8..3856114 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -8,4 +8,8 @@
   resources :events,          only: [:index, :show]
   resources :event_instances, only: [:new, :create, :show]
   resources :tags, only: [:show]
+
+  get '/session/authenticate', to: 'session#authenticate', as: 'sign_in'
+  get '/session/callback', to: 'session#callback'
+  get '/session/terminate', to: 'session#terminate', as: 'sign_out'
 end
diff --git a/docker-compose.yml b/docker-compose.yml
index 58be121..ad8985d 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -12,13 +12,14 @@ services:
       - 3000:3000
     volumes:
       - ./:/opt/app
-      - rails_tmp:/opt/app/tmp
     depends_on:
       - db
     environment:
       - RECAPTCHA_SITE_KEY=aaaaa
       - RAILS_ADMIN_USERNAME=rails
       - RAILS_ADMIN_PASSWORD=rails
+      - CLIENT_ID=test_0xKvM6N9
+      - CLIENT_SECRET=test_y2650o6pLoxNejD9
   db:
     image: postgres:11.2
     ports: