Mike Kear said:
>
> Anyway, he says there's a security issue with using a token
> throughout for a session, so each page view has to issue a new
> token, and expire the last one.

What he wants is called "replay protection". It is considered a solved
problem. Instead of using the half-baked design of your client, you
should use the industry standard, peer reviewed, time tested design of
HTTP Digest Authentication. See RFC 2617 for details.

And the good news: it is build in to most browsers and webservers and
you can build a custom client variables solution on top of it.

Jochem




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