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=== Untraceable CAPTCHAs ===
A CAPTCHA or "Completely Automated Public [[Turing test]] to tell Computers and Humans Apart"<ref>{{Cite web |title=What is CAPTCHA? |url=https://support.google.com/a/answer/1217728 |url-status=live |archive-url=https://web.archive.org/web/20200806173938/https://support.google.com/a/answer/1217728 |archive-date=6 August 2020 |access-date=2022-09-09 |website=Google Support |publisher=Google Inc. |quote=CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a [...]}}</ref> is a mechanism to prevent automated robots or ([[Internet bot|bots]]) from accessing websites. Lately, mechanisms for running CAPTCHA tests have been centralized to services such as
Recently, CloudFlare developed a privacy-preserving technology called "Privacy Pass".<ref>{{cite web |last1=Sullivan |first1=Nick |title=Cloudflare supports Privacy Pass |url=https://blog.cloudflare.com/cloudflare-supports-privacy-pass/ |website=CloudFlare |date=9 November 2017 |publisher=CloudFlare.com |access-date=30 January 2024}}</ref> This technology is based on OPRFs, and enables the client's browser to obtain passes from CloudFlare and then present them to bypass CAPTCHA tests. Due to the fact that the CloudFlare service is oblivious to which passes were provided to which users, there is no way it can correlate users with the websites they visit. This prevents tracking of the user, and thereby preserves the user's privacy.
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