Privacy Pass
Privacy Pass - “The Math”
https://blog.cloudflare.com/privacy-pass-the-math/#dleqproofs
Privacy Pass: Bypassing Internet Challenges Anonymously
https://www.petsymposium.org/2018/files/papers/issue3/popets-2018-0026.pdf
Challenge Bypass Extension
https://github.com/privacypass/challenge-bypass-extension
slide
https://crypto.dance/projects/7128053
Exploring Privacy Pass by kobi