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I think all cookies are sent with every request, so cookies can't be used to (securely) pass data to the next page. It'd work just fine on the login page, but every page after that would have to renegotiate to generate a new cookie, meaning you basically just created SSL everywhere.

Local storage, however, could probably be used to do just such a thing, as it exists only locally. In which case you could just have the login page generate an RSA key pair, receive the server's public key in the response, and use that for any kind of secure communication on each page load. The server would have to remember sessions => encryption keys, but that's not too hard.




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