author of cryptocat and minilock Nadim Kobeissi has created a new security application called Peerio. Peerio combines secure messaging, file sharing and storage.
Peerio lets you send messages, share files, and store documents online — securely and privately. Free cloud storage keeps your files online and ready to send from anywhere. It’s as easy to use as e-mail, but with a significant additional layer of security — end-to-end encryption.

You can try Peerio from google webstore: https://chrome.google.com/webstore/detail/peerio/khipofjlgnklanmhddccafbogkkhmdpm;

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