>I thank anyone in advance who can suggest an appropriate, secure
>methodology to generate our pass code, or who can guide me in the direction
>of literature on the subject.
 
Barry,
An excellent reference on the subject is "Applied Cryptography" by Bruce
Schneier. I'm preparing a review of it for the list, but it's one of the
best reference books I've ever seen, on _any_ subject. It includes C source
code for the algorithms, and careful cryptographic analysis of each
algorithm as well as information on secure procedures. It's one of the few
books which caused me to think "I didn't pay enough for this!"
 
-- Bruce
 
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