security code number generation

Pete pete at
Mon Jul 18 00:13:51 CDT 2011

I'm looking for something to generate license codes for some software I'm
planning to sell.  Do you think this would work for that purpose?
Molly's Revenge <>

On Sat, Apr 2, 2011 at 9:51 AM, Peter Brigham MD <pmbrig at> wrote:

> 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
> pmbrig at
>**pmbrig <>
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