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Secure Hash Algorithm is a family of cryptographic hash functions published by NIST. This includes SHA-1, and the SHA-2 and SHA-3 families of functions. SHA-1 is deprecated for all usages.

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Is Git crowdsourcing cryptographic attacks?

But Git is using SHA-1 hashes as object identifiers. So there are a lot of already computed hashes out there in the public Git repositories of the web, along with details on how to reproduce them. … Something like “well, I can do something evil if I replace this unknown plain text with some other plain text with the same SHA-1 hash, so instead of computing a collision I'll google for it.” …
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