Note that if you store something in a cookie, and all that's required for authentication is to echo back what's in the cookie, it hardly matters whether you store an encrypted password, or a random number. You will be vunerable against session hijacking. Someone able to snoop the connection between the client and the server can intercept the cookie, and hence pretent to be the person that is logged in.

You might want to consider using an encrypted channel instead.

Abigail

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