On 11-Jun-2010 17:05, Simon Coulter wrote:

Looking for suggestions:

I want to protect access to an application via a password. I
want the password to automatically change daily. I want the
application to be able to determine today's password without
having to read it from an external source (i.e.,
algorithmically/programmatically derived). <<SNIP>>

The "automatic daily change" requirement means the password
generation/validation is tied to the date but obviously simple
encryption linked to the date will not be very secure nor will
each daily password be sufficiently different from the previous
one.

<<SNIP>>

A pseudo-random number, generated from the current date value as its seed value, I expect could assist to make a generated password sufficiently different each day.?

Your question has me curious about what limits would be placed on the password characters? I suppose any code point except possibly a 0x00 given a program-to-program communication of the previously dispensed password value, or perhaps only characters easily typed at a known-language keyboard given some user would actually have to provide [by typing] a replica of the previously dispensed password?

Regards, Chuck

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