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Musk claimed that Signal has unpatched security vulnerabilities. As a cryptography expert I’m not aware of any: instead Signal has top-notch state-of-the-art encryption which has been adopted by its competitors it’s so good.

Telegram isn’t end-to-end encrypted by default. It has no group chat encryption whatsoever. It uses a bizarre, badly designed “MTProto” protocol about which dozens of cryptography papers have documented myriad unfixed flaws.