How to Check Authenticity of an AJAX Request

Question

I am designing a web site in which users solve puzzles as quickly as they can. JavaScript is used to time each puzzle, and the number of milliseconds is sent to the server via A

Answer 1

there is a very fast implementation of cryptography in js here

http://crypto.stanford.edu/sjcl/

it allows public / private key encryption all on the client and I think you can adapt it to encrypt the Ajax communication between your server and the client browser

here is a detailed explanation, which you can adapt to your needs http://crypto.stanford.edu/sjcl/#usage