diff --git a/boards/forms.py b/boards/forms.py
--- a/boards/forms.py
+++ b/boards/forms.py
@@ -1,3 +1,4 @@
+import hashlib
 import re
 import time
 import pytz
@@ -151,6 +152,7 @@ class PostForm(NeboardForm):
     threads = forms.CharField(required=False, label=_('Additional threads'),
             widget=forms.TextInput(attrs={ATTRIBUTE_PLACEHOLDER:
                 '123 456 789'}))
+    tripcode = forms.BooleanField(label=_('Tripcode'), required=False)
 
     session = None
     need_to_ban = False
@@ -237,6 +239,10 @@ class PostForm(NeboardForm):
         file = self.cleaned_data['file']
         return file or self.cleaned_data['file_url']
 
+    def get_tripcode(self):
+        if self.cleaned_data['tripcode']:
+            return hashlib.sha1(self.session.session_key.encode()).hexdigest()
+
     def _clean_text_file(self):
         text = self.cleaned_data.get('text')
         file = self.get_file()
diff --git a/boards/migrations/0024_post_tripcode.py b/boards/migrations/0024_post_tripcode.py
new file mode 100644
--- /dev/null
+++ b/boards/migrations/0024_post_tripcode.py
@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('boards', '0023_auto_20150818_1026'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='post',
+            name='tripcode',
+            field=models.CharField(max_length=50, null=True),
+        ),
+    ]
diff --git a/boards/models/post/__init__.py b/boards/models/post/__init__.py
--- a/boards/models/post/__init__.py
+++ b/boards/models/post/__init__.py
@@ -74,7 +74,7 @@ IMAGE_TYPES = (
 class PostManager(models.Manager):
     @transaction.atomic
     def create_post(self, title: str, text: str, file=None, thread=None,
-            ip=NO_IP, tags: list=None, opening_posts: list=None):
+            ip=NO_IP, tags: list=None, opening_posts: list=None, tripcode=None):
         """
         Creates new post
         """
@@ -106,7 +106,8 @@ class PostManager(models.Manager):
                            pub_time=posting_time,
                            poster_ip=ip,
                            thread=thread,
-                           last_edit_time=posting_time)
+                           last_edit_time=posting_time,
+                           tripcode=tripcode)
         post.threads.add(thread)
 
         logger = logging.getLogger('boards.post.create')
@@ -201,6 +202,8 @@ class Post(models.Model, Viewable):
     url = models.TextField()
     uid = models.TextField(db_index=True)
 
+    tripcode = models.CharField(max_length=50, null=True)
+
     def __str__(self):
         return 'P#{}/{}'.format(self.id, self.title)
 
@@ -436,3 +439,9 @@ class Post(models.Model, Viewable):
                 thread.last_edit_time = self.last_edit_time
                 thread.save(update_fields=['last_edit_time', 'bumpable'])
             self.threads.add(opening_post.get_thread())
+
+    def get_tripcode_color(self):
+        return self.tripcode[:6]
+
+    def get_short_tripcode(self):
+        return self.tripcode[:10]
\ No newline at end of file
diff --git a/boards/static/css/md/base_page.css b/boards/static/css/md/base_page.css
--- a/boards/static/css/md/base_page.css
+++ b/boards/static/css/md/base_page.css
@@ -167,7 +167,7 @@ p, .br {
     display: table-cell;
 }
 
-.post-form input:not([name="image"]), .post-form textarea, .post-form select {
+.post-form input:not([name="image"]):not([type="checkbox"]):not([type="submit"]), .post-form textarea, .post-form select {
     background: #333;
     color: #fff;
     border: solid 1px;
@@ -192,7 +192,7 @@ p, .br {
     margin-bottom: 0.5ex;
 }
 
-.post-form input[type="submit"], input[type="submit"] {
+input[type="submit"] {
     background: #222;
     border: solid 2px #fff;
     color: #fff;
diff --git a/boards/templates/boards/post.html b/boards/templates/boards/post.html
--- a/boards/templates/boards/post.html
+++ b/boards/templates/boards/post.html
@@ -8,6 +8,9 @@
         <a class="post_id" href="{{ post.get_absolute_url }}">#{{ post.get_absolute_id }}</a>
         <span class="title">{{ post.title }}</span>
         <span class="pub_time"><time datetime="{{ post.pub_time|date:'c' }}">{{ post.pub_time }}</time></span>
+        {% if post.tripcode %}
+            <span style="color: #{{post.get_tripcode_color}}">{{ post.get_short_tripcode }}</span>
+        {% endif %}
         {% comment %}
             Thread death time needs to be shown only if the thread is alredy archived
             and this is an opening post (thread death time) or a post for popup
diff --git a/boards/views/all_threads.py b/boards/views/all_threads.py
--- a/boards/views/all_threads.py
+++ b/boards/views/all_threads.py
@@ -151,7 +151,8 @@ class AllThreadsView(PostMixin, BaseBoar
         tags = self.parse_tags_string(tag_strings)
 
         post = Post.objects.create_post(title=title, text=text, file=file,
-                                        ip=ip, tags=tags, opening_posts=threads)
+                                        ip=ip, tags=tags, opening_posts=threads,
+                                        tripcode=form.get_tripcode())
 
         # This is required to update the threads to which posts we have replied
         # when creating this one
diff --git a/boards/views/thread/thread.py b/boards/views/thread/thread.py
--- a/boards/views/thread/thread.py
+++ b/boards/views/thread/thread.py
@@ -1,3 +1,4 @@
+import hashlib
 from django.core.exceptions import ObjectDoesNotExist
 from django.http import Http404
 from django.shortcuts import get_object_or_404, render, redirect
@@ -111,7 +112,8 @@ class ThreadView(BaseBoardView, PostMixi
 
         post = Post.objects.create_post(title=title, text=text, file=file,
                                         thread=post_thread, ip=ip,
-                                        opening_posts=threads)
+                                        opening_posts=threads,
+                                        tripcode=form.get_tripcode())
         post.notify_clients()
 
         if html_response: