On: Telegram told to give encryption keys to Russian authorities

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Correct, this is part of the Signal protocol[1]. Specifically, this part is called Sesame[2]:

> This document describes the Sesame algorithm for managing message encryption sessions in an asynchronous and multi-device setting.

[1] https://www.signal.org/docs/

[2] https://www.signal.org/docs/specifications/sesame/