San Francisco, May 8 (IANS): As data security concerns on Facebook and WhatsApp loom large, Twitter is reportedly working on a 'Secret' encrypted messages feature which could make the microblogging platform safer for sensitive communications.

With this feature, Twitter is expected to roll out options about encrypted messaging like starting a secret conversation and viewing both sides of the conversation for encryption keys to verify a secure connection, TechCrunch reported on Monday.

The encrypted Direct Message (DM) option was first spotted inside Twitter for APK that contains codes for unreleased features that companies are testing.

Instant messaging app WhatsApp uses "end-to-end encryption" in all conversations. This can be opted into Messenger.

End-to-end encrypted messages are secured with a lock and only the sender and recipient have the special key needed to unlock and read them.

For added protection, every message sent has its own unique lock and key. No one can intercept the communications.

Last week, WhatsApp co-founder and CEO Jan Koum quit reportedly "after clashing with its parent, Facebook, over the popular messaging service's strategy and Facebook's attempts to use its personal data and weaken its encryption".