From Collisions to Chosen-Prefix Collisions Application to Full SHA-1 https://eprint.iacr.org/2019/459.pdf
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Chosen-prefix collisions on SHA-1 are practical. Stop using SHA-1 *now*.
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Replying to @jedisct1
Crypto noob here: if I can do a chosen-prefix attack on a hash, does that imply I can create a hash collision even if the data I have control over is inserted into the middle of a string rather than the end?
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Replying to @LizardOrman
If the suffix is the same, yes.
10:39 AM - 10 May 2019
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