Seriously, stop using SHA-1! SHA-1 chosen-prefix collisions are now practically demonstrated. Beware of ALL possible collision exploits. E.g. see the amazing list of PoCs by @angealbertini.https://twitter.com/IACR_News/status/1214482323808358400 …
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Funny that both for MD5 and SHA-1 the first chosen-prefix collision happened 3 years after the first identical-prefix collision. Note that for MD5 five years later FLAME used a CP-collision to create a signed malicious windows update exe, because MD5 was still used & accepted.
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