SHA-1 is a hash function that will soon be two generations old. It is no longer considered secure and should only be used for backward compatibility.

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HMAC-SHA1 vs HMAC-SHA256 for data storage

Reading the question “HMAC-SHA1 vs HMAC-SHA256”, I figured out that the known attacks on SHA1 don't apply to its HMAC version. So, HMAC-SHA1 is quite strong right now. In a protocol like SSL, if it ...