Cloudflare Ends CAPTCHAs For Tor Users (zdnet.com)

Cloudflare announced on Monday a new service named the “Cloudflare Onion Service” that can distinguish between bots and legitimate Tor traffic. The main advantage of this new service is, said Cloudflare, that Tor users will see far less, or even no CAPTCHAs when accessing a Cloudflare-protected website via the Tor Browser. A reader writes: The new Cloudflare Onion Service needed the Tor team to make “a small tweak in the Tor binary,” hence it will only work with recent versions of the Tor Browser — the Tor Browser 8.0 and the new Tor Browser for Android, both launched earlier this month. Tor users have been complaining about seeing too many CAPTCHAs when accessing a Cloudflare-protect site for years now. In February 2016, Tor Project administrators went as far as to accuse Cloudflare of “sabotaging Tor traffic” by forcing Tor users to solve CAPTCHA fields ten times or more, in some cases.

Cloudflare responded to accusations a month later, claiming the company was only showing CAPTCHAs because 94 percent of all Tor traffic was either automated bots or originating from malicious actors. Half a year later, in October 2016, Cloudflare started looking into methods of removing CAPTCHAS for Tor users. Their first foray was the Challenge Bypass Specification and a Tor Browser extension, but that project didn’t go too far, and has been eventually replaced by the new Cloudflare Onion Service today.

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