Telegram

Telegram, like Signal and WhatsApp, allows users to link their phone number to a Telegram account in order to send rapid, encrypted communications via the internet, including client-server encryption for normal chats. However, Telegram is much more than simply a chat app. It has evolved into a social media platform, with massive user groups and broadcasts that allow accounts to instantly reach millions of followers. It has applications that go well beyond encrypted texting.

End-to-end encryption, on the other hand, is not enabled by default on Telegram. To obtain it, you must first enter Secret Chat mode. You may arrange messages to self-destruct, exchange movies and documents, and join group conversations with up to 200,000 other people. (Yes, Telegram does support such massive group conversations.) Chats with more than two participants, on the other hand, will not be encrypted end-to-end.

Is there a catch? Rather than relying on a more established technology, Telegram employs its own unique MTProto encryption. Apart from group chats, information-security experts agree that Telegram may not be very secure, though the FBI does not appear to have worked out a means to get in.

Detailed information:

Self-Destructing Messages: Yes
Data Stored: None from Secret Chats

Website: https://telegram.org/