Researchers at 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 individual chats, the MTProto protocol is used in the service’s group chats (also known as cloud chats) and when users do not opt ​​for E2EE. MTProto is Telegram’s version of Transport Level Security (TLS) that is used to secure data in transit and protect users from man-in-the-middle attacks.

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