For anyone who might have the need, I have a handler I use to generate
a security code, in my case for printed prescriptions. It takes the
name of the patient, the date of the prescription, the medication and
med strength and hashes all that to produce a ten-digit alphanumeric
string (using 0-9, a-z, A-Z). If there is any question about the
validity of the prescription I can retrieve the correct code from the
rx entry in my database with a mouseclick (actually recalculating the
code from the stored rx data) and confirm it with the pharmacy. This
has proved useful on two occasions when a pt was playing fast and
loose with his prescriptions.
The algorithm is fast in LC, sufficiently obscure that I'm pretty sure
it would be hard to hack -- though of course few things are
bulletproof in encryption if someone wants to try hard enough -- and
discontinuous in the sense that similar inputs do not generate similar
outputs, eg, change one character in the input and the code number is
completely different. The probability of coming up with the correct
security number by chance alone is 1 in 10^15 (a million billion to
1). It could be adapted to any number of purposes. I am not posting
the handler here, since it would be unwise to let it be archived and
available, eg, with a Nabble search, but if anyone is interested, let
me know and I'll share it.
-- Peter
Peter M. Brigham
pmb...@gmail.com
http://home.comcast.net/~pmbrig
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