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PGP certificate authority CAcert still uses it, as does the GIT software versioning system. SHA1 is a ticking time bomb. Developers should jettison it ASAP lest we see another Flame-style attack in the wild.
The 2012 Flame collision attack may have needed $200,000 worth of computing power https://arstechnica.com/information-technology/2012/06/flame-crypto-attack-may-have-needed-massive-compute-power/ …). The new SHA1 attack costs just $11,000. If attackers have a reason to achieve a chosen prefix attack against SHA1, there's nothing stopping them.
GnuPG developers still insist that SHA1 is broken only in an "extremely narrow sense." Attacks only get better, and for all we know, real-world adversaries may already have more advanced exploits.https://twitter.com/matthew_d_green/status/1214573983087108097 …
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