--On 10 February 2006 19:30 +0000 Ben Laurie wrote:

> Also, FWIW, hash algorithms are perfectly usable as encryption algorithms.


Pardon? One of the features of most hashes is that they are not invertible,
and another features is that the range is far smaller than the domain. I
agree that most encryption algorithms are usable as hash algorithms (as
without the decrypt key, a good encryption algorithm is not invertible) if
a subset of the output range is taken (i.e. a limited number of bits), but
encryption algorithms with a range of less size than their domain are not
in general helpful, so the converse as far as I know is not true.

But we'd all be grateful for the SHA-256 "decryption" algorithm if you
have one!

Alex

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