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A comment on Updating the Git protocol for SHA-256. Parent comment

Re:Updating the Git protocol for SHA-256 by dependenttypes on Saturday June 20, 2020 @03:21PM (#23586261)
> where you should be able to more cheaply run a preimage attack against two 64bit hash functions than one 128bit hash function.

Try doing that in my example.

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Re:Updating the Git protocol for SHA-256 by freemint on Monday June 22, 2020 @09:13AM (#23599784)
Your hash functions are contrustructed in a way such that the concatenation has the security properties of a 128 bit hash function (because your construction is equivalent md5). I am not sure that results holds for all concatenations of hash functions. Or for SHA concatenations.

I appreciate you making me think deeper about hash functions. Nice construction.

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