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It's an ugly protocol, but that's because things that are elegant are rarely secure.

Funny, my experience has been exactly the opposite.

But [your block cipher] probably exposed to side-channel attacks either way.

Exposed, yes. Exposed to attackers who don't hold the MAC key, no. Exposed to chosen-ciphertext side channel attacks, no. These distinctions matter.

having to slog through people's terrible crypto on a monthly basis

I do this too. But I try to educate people so that they write slightly less crypto.




Are you consulting now?


Yes.


Good to hear it. I think you'll come around to my way of thinking soon enough. =)




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