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title
SHA-1 is a Shambles
description
image
site name
SHA-1 is a Shambles
author
updated
2026-02-05 23:49:36
raw text
SHA-1 is a Shambles SHA-1 is a Shambles We have computed the very first chosen-prefix collision for SHA-1 . In a nutshell, this means a complete and practical break of the SHA-1 hash function, with dangerous practical implications if you are still using this hash function. To put it in another way: all attacks that are practical on MD5 are now also practical on SHA-1. Check our paper here for more details. Slides from RWC are also available. Our Contributions Complexity Improvements We have significantly improved the complexity of SHA-1 attacks, with a speedup factor around 10. More precisely, we have reduced the cost of a collision attack from 2 64.7 to 2 61.2 , and the cost of a chosen-prefix collision attack from 2 67.1 to 2 63.4 (on a GTX 970 GPU). Record Computation We implemented the entire chosen-prefix collision attack with those improvements. This attack is extremely technical, contains many details, various steps, and requires a lot of engi...
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SEC and Crypto [en] (228)
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6 - eprint.iacr.org, dns.cam.ac.uk, mailarchive.ietf.org, eurocrypt.iacr.org
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2026-02-05 23:49:36
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