CryptoMessanger – a great app for Android that can keep your messages (messages) in the social network Vkontakte, so that not one soul, except you of course, will not be able to read it. How it works:

• Install the application and run it;
• Click "Authorization" window will appear to log into the site;
• Enter login information and click "Login", click "Allow";
• Wait 5 to 10 seconds – the time for key generation, the following window appears communication;
• Select a friend by clicking "Select another". Will appear in the friends list, from which select other click;
• Exchange with the partner keys press both sides of the "Send key";
• once you and your partner have clicked on this button, you have a fully encrypted conversation.