encryption

[Fairlight]

You'll never BELIEVE what Richard Kreiss said here...:
> Question:
> 
> The same Credit card number encrypted in two file using the same encryption
> method.
> 
> Can I compare the encrypted value in processing to see if they match or do I
> need to unencrypted both and then compare?

Depends what algorithm and if it is guaranteed to yield identical results.
DES, for instance, uses a 2-byte salt.  Encrypt the same data with two
different salts, and the result is two different strings.  In that case,
you could not do a result comparison.

m->
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