Cloudflare CAPTCHA: a timing attack threat on TOR users

Internet is NOT a safe place… Even the most innocent – looking of its elements can threat users’ privacy and anonymity…

When this is done by an integral piece of tech like CAPTCHA’s from a major service provider like Cloudflare, then it is definitely interesting news…

“Cloudflare’s insistence on solving reCAPTCHA puzzles when visitors are coming from Tor exit nodes to one of the 2 million web sites that Cloudflare ‘protects’ can be very instrumental for traffic analysis and de-anonymizing of Tor users.”


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