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Cloudflare is free of CAPTCHAs; Turnstile is free for everyone (blog.cloudflare.com)

submitted 11 months ago* (last edited 11 months ago) by [email protected] to c/[email protected]

17 comments fedilink hide all child comments

I've actually noticed this in some websites the past ~two months. It's neat to have a captcha that finally doesn't need slowly clicking images to pass through.

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[–] [email protected] 12 points 11 months ago

Nothing can stop 100% of bots. The goal with captchas like Turnstile is to use a significant portion of your resources to the point it's expensive and slow to perform an attack.

Turnstile runs many background checks on your browser, so headless browsers automatically become futile.

JavaScript PoW challenges are performed that take up multiple seconds of execution time, memory and CPU. This alone is a deterrent because sequential attacks become extremely long to execute.

Concurrent attacks are still unfeasible because Turnstile ups the difficulty if it detects something is up, and receiving requests from thousands of botnet IPs is bound to trip an alarm.