Targeted sha-1 collisions now apparently much more possible and cheaper with new research zdnet.com/article/sha-1-collis

How long till someone introduces an intentional cycle in a git repository? Anyone want to place bets on which one? My guess: the linux kernel, sometime in the next 1.5 years.

HT @rixx for the link

@cwebber question is, does the sha1 variant hardened against SHAttered detect this, and/or can it be improved to detect this?

@cwebber since git already uses that sha1 since SHAttered

@cwebber personally I assumed sha1 chosen-prefix attacks would be the next thing, and already hardened git-annex's use of git against them :P

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@cwebber no, but basically have enough control over your data formats that there's no place to hide the added data that makes the collision happen

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