Craigslist and Yelp also appear to have their own custom detection algorithms to limit Tor users. The Tor Project has a list of commonly seen blocking messages, including one from Akamai, another large content delivery service. If an IP address has a poor reputation, visitors that have come through via that flagged exit node might see a CAPTCHA, the jumbled text that users have to solve before proceeding. The problem is that while Tor is used by people looking to safeguard their privacy, it's also used by cyberattackers to mask their activities.īecause of that, some companies that provide specialized and attack-resistant content delivery systems have either blocked or made it difficult for those using Tor to access services, the researchers wrote.ĬloudFlare, a large content delivery service, does not explicitly block Tor users, but it does assign a reputation score to Tor exit nodes.
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