I did something like this for a web-site that uses 'http' and not 'https'. The site required the user to login before seeing his information. The purpose was to prevent malicious updating of user information by hackers, and the site did not hold any sensitive information.
The tokens never repeated, and were generated so that they had to be used within 1 minute.
If this is what you need, I'll find the code and post it.
For our purposes this was safe enough!
"Well done is better than well said." - Benjamin Franklin
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