On 12/06/2010, at 8:30 AM, DrFranken wrote:

I like the concept but your requirement to NOT store the Password Of the
Day and generate it every time it's needed means you can't pick other
external inputs to feed the process. For example you could call a web
service to check the temperature in some known location as one bit of
the seed, then check the water level in some river, toss in the cycle of
the moon, and the date, mix in the percent full of the disks, and add a
pinch of the faulting rate for the *BASE pool. Oh but all of those
things change constantly except the date, rats.

Tongue firmly in cheek ... well I could use the date to calculate the moon's phase, distance, and position, and use those values to generate a seed, an offset and a range, then encrypt program constants at that offset and range giving the password. Varying how the calculated values are used will change the algorithm. Not cryptographically secure but difficult enough to make it not worth the effort.

Maybe you could
architect it so the P.O.D. is kept in a running program only and
requested from that program. Each time the program starts or when some
magic time each day occurs it generates the P.O.D and holds it. Just a

Not ideal in this case. I've got a bunch of one-time password stuff to read up on. That might give me a solution.

Simon Coulter.
FlyByNight Software OS/400, i5/OS Technical Specialists

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