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When thinking about security and user experience, what information id OK, acceptable, or even a good idea to store in a cookie?
EDIT:
With the understanding that sensitive info, like user names, passwords, SSN, credit card numbers don’t belong there, what does?
Definitely not passwords! Or anything sensitive… remember that cookies are stored on people’s computers so from your point of view (as a website developer), they’re basically out in the wild, potentially accessible to anyone.
A common practice is to just store a session ID in a cookie, and store all other relevant information in a database (or file, or whatever) on the server, indexed by session ID.