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


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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