[ILUG] hashing algorithm
jm at jmason.org
Tue Sep 5 12:02:22 IST 2000
Caolan McNamara said:
> We talking at cross purposes here, just to be clear on everything, SHA1
> (Secure Hash Algorithm) is a hashing algorithm. They are not intended to
> encrypt something, just to generate a fixed len chunk of data that uniquely
> identifys it. Theres no way back from their hash, theres often a use for
> them in encryption software but something like crypt is not a hashing
> algorithm and neither is technology like SSL.
Just to drift slightly OT in the traditional manner: actually, hash algos
can be used to encrypt, just fine. Schneier's Applied Cryptography goes
into some details (18.11, _One Way Hash Functions Using Symmetric Block
To illustrate: UNIX crypt(3) uses DES, which is indeed a encryption
algorithm, but it's used as a hash in UNIX passwd files.
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