If I copy a cookie from someone's browser (small amount of handwaving here on how I get it in the first place) then it doesn't really matter how I encode it unless I am using some sort of Diffie-Hellman pair. I'd still be stealing someone's identity.
Unless there is some sort of challenge/response happening where the user has to perform some active function such as type in a password, use a smart card, or whatever using a client side cookie is just asking for trouble.
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Peter L. Berghold --- Peter@Berghold.Net
"Those who fail to learn from history are condemned to repeat it."
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