Google ‚Security Blog‘ – announcing the first SHA1 collision

   Cryptographic hash functions like SHA-1 are a cryptographer’s swiss army knife. A collision occurs when two distinct pieces of data – a document, a binary, or a website’s certificate – hash to the same digest. In practice, collisions should never occur for secure hash functions. However if the hash algorithm has some flaws, as SHA-1 does, a well-funded attacker can craft a collision

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