GCM and many new AEs are less safe than most older AE due to nonce reuse making forgeries possible. And we’re adopting it everywhere.pic.twitter.com/t9pnzvvdcM
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GCM and many new AEs are less safe than most older AE due to nonce reuse making forgeries possible. And we’re adopting it everywhere.pic.twitter.com/t9pnzvvdcM
We knew how to make MAC not depend on nonce and then created AE constructions that do depend on it for performance reasons.
Usual argument is that if nonce is repeated, protocol or implementation is badly designed.
Are seatbelts and airbags unnecessary if all drivers drive carefully?
We know from practice that many protocols are badly designed, and implementations suck. Crypto primitives should be designed for that.
I hope nonce-misuse resistant crypto is the future. I’m happy to see more of it recently: NORX and Farfalle specify such mode, GCM-SIV.
Nod. But it may help to call this property “nonce-reuse resistance” instead of “nonce-misuse”.
If developers have to choose between “idiot-proof” and “regular”, they will pick the later. The first one is insulting.
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