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by MatejKafka 763 days ago
Math experts are not necessarily good cryptographers, and authors of MTProto were not renowned cryptographers (unlike with Signal).

Most people in the cryptographic community agree that the Signal protocol is well-designed, is widely believed to be secure, and the authors react openly and swiftly to potential issues. Meanwhile, a lot of the MTProto crypto is just weird (that is, it does not follow standard practices of the field, without strong reasons to do so), and many cryptographers treat it with suspicion.