Sicher from the IM+ team promises to keep your messages 'super-safe'

Sicher, a new "super-safe" messenger has arrived today on Windows Phone, iPhone and Android devices. Sicher (pronounced "Zee-her") comes from the team behind IM+ and brings free, encrypted chats and file transfers to users. Using the app, you'll be able to chat, send files, photos and voice messages to other users. Sicher goes so far as to not show incoming messages on your lock screen (only an alert) so you have to open the app to get the full message. Sicher features secure end-to-end encryption of messages, files and group chats, anonymous push notifications and self-destruction message settings.

source: androidcentral