Researchers from the University of London’s Royal Holloway have discovered several flaws in the MTProto protocol used by the popular encrypted messaging app Telegram.

While end-to-end encryption (E2EE) is available in one-on-one chats, the MTProto protocol is used in the service’s group chats (also known as cloud chats) as well as when users don’t opt-in for E2EE. MTProto is Telegram’s version of transport level security (TLS) which is used to secure data in transit and to protect users from man-in-the middle attacks.



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