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Re: [openpgp] OpenPGP SEIP downgrade attack

2015-10-07 08:51:19
Werner Koch <wk(_at_)gnupg(_dot_)org> writes:

And wait another 15 years until it has been taken up by all implementations?
What is wrong with the planned AE mode?

Which has just as little support as a planned EtM mode?  

The reason why I prefer EtM is that it can be pretty trivially retrofitted to
existing crypto (just add a SHA-256 MAC somewhere) and is compatible with any
existing cipher, while whatever AEAD mechanism is chosen (I'm guessing AES-
GCM, which seems to be fashionable) is purely for AES, there's no Twofish or
CAST or whatever AEAD mode defined.

Peter.

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