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Cloudflare teams up with Chrome, Edge, and Firefox to tackle bot traffic without CAPTCHAs
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This is a most excellent place for technology news and articles.
Why do you assume it's one static unchanging token? That's not how cryptography works, you can issue virtually unlimited signatures or challenges/responses without the other party knowing your private key
It's cryptographically impossible to ensure that kind of security.
Are you saying asymmetric cryptography doesn't exist or is not secure? You may want to collect your research prize and/or bring down the global banking system