diff --git a/isso/js/app/config.js b/isso/js/app/config.js
index 043cdb4..08bdbde 100644
--- a/isso/js/app/config.js
+++ b/isso/js/app/config.js
@@ -8,6 +8,8 @@ define(function() {
         "max-comments-top": "inf",
         "max-comments-nested": 5,
         "reveal-on-click": 5,
+        "auth": false,
+        "signin": "",
         "avatar": true,
         "avatar-bg": "#f0f0f0",
         "avatar-fg": ["#9abf88", "#5698c4", "#e279a3", "#9163b6",
diff --git a/isso/js/app/i18n/en.js b/isso/js/app/i18n/en.js
index ec4b4d0..6650414 100644
--- a/isso/js/app/i18n/en.js
+++ b/isso/js/app/i18n/en.js
@@ -3,7 +3,10 @@ define({
     "postbox-author": "Name (optional)",
     "postbox-email": "E-mail (optional)",
     "postbox-website": "Website (optional)",
-    "postbox-submit": "Submit",
+    "postbox-submit": "submit",
+    "postbox-auth-required": "Authentication required to comment.",
+    "postbox-auth-sign-in": "Sign-in",
+    "postbox-auth-commenting-as": "Commenting as",
 
     "num-comments": "One Comment\n{{ n }} Comments",
     "no-comments": "No Comments Yet",
diff --git a/isso/js/app/isso.js b/isso/js/app/isso.js
index 4312d45..d6ef149 100644
--- a/isso/js/app/isso.js
+++ b/isso/js/app/isso.js
@@ -24,7 +24,11 @@ define(["app/dom", "app/utils", "app/config", "app/api", "app/jade", "app/i18n",
 
         // submit form, initialize optional fields with `null` and reset form.
         // If replied to a comment, remove form completely.
-        $("[type=submit]", el).on("click", function() {
+        submit = $("[type=submit]", el)
+        if (submit === null) {
+            return el;
+        }
+        submit.on("click", function() {
             if (! el.validate()) {
                 return;
             }
diff --git a/isso/js/app/text/postbox.jade b/isso/js/app/text/postbox.jade
index a2428de..f0ad123 100644
--- a/isso/js/app/text/postbox.jade
+++ b/isso/js/app/text/postbox.jade
@@ -1,14 +1,25 @@
-div(class='isso-postbox')
+mixin form(style)
     div(class='form-wrapper')
         div(class='textarea-wrapper')
             div(class='textarea placeholder' contenteditable='true')
                 = i18n('postbox-text')
         section(class='auth-section')
-            p(class='input-wrapper')
+            p(class='input-wrapper' style=style)
                 input(type='text' name='author' placeholder=i18n('postbox-author'))
-            p(class='input-wrapper')
+            p(class='input-wrapper' style=style)
                 input(type='email' name='email' placeholder=i18n('postbox-email'))
-            p(class='input-wrapper')
+            p(class='input-wrapper' style=style)
                 input(type='text' name='website' placeholder=i18n('postbox-website'))
             p(class='post-action')
                 input(type='submit' value=i18n('postbox-submit'))
+
+div(class='isso-postbox')
+    if conf.auth
+        if cookie.valid
+            p=i18n('postbox-auth-commenting-as') + ' ' + cookie.username
+            +form('visibility: hidden;')
+        else
+            p=i18n('postbox-auth-required')
+                a(href='#{conf.signin}') #{i18n('postbox-auth-sign-in')}
+    else
+        +form('')
diff --git a/isso/js/embed.js b/isso/js/embed.js
index 680880b..8134315 100644
--- a/isso/js/embed.js
+++ b/isso/js/embed.js
@@ -11,6 +11,7 @@ require(["app/lib/ready", "app/config", "app/i18n", "app/api", "app/isso", "app/
     jade.set("i18n", i18n.translate);
     jade.set("pluralize", i18n.pluralize);
     jade.set("svg", svg);
+    jade.set("cookie", {'valid': true, 'username': 'Nicolas'})
 
     domready(function() {