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Password hashes need first pre-image resistance and should not cause many collisions among typical passwords (preserve the entropy). This collision "attack" violates neither requirement and causes no practical security issues. While this issue can find trivial collisions, they're not between commonly chosen passwords. A SHA-1 hash (and thus the shorter of ...


No, it is not broken. This is NOT A PROBLEM for PBKDF2-HMAC-SHA1. The PBKDF2-HMAC-SHA1 function is a key derivation function (password-based key derivation). It is fairly good function, for instance it is recommended by NIST (NIST SP 800-132). It is (relatively) rare for this function to have a collision, but collisions generally are not a problem for key ...

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