this post was submitted on 23 Feb 2024
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No Stupid Questions

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I have noticed that some CAPTCHA pages, like Cloudflare's, simply ask you to check a box to proceed. There is no clicking on traffic lights or entering characters. How does clicking on a check box tell them I am not a robot?

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[–] [email protected] 23 points 8 months ago* (last edited 8 months ago) (3 children)

Rather than try to unilaterally deprecate and replace CAPTCHA with a single alternative, we built a platform to test many alternatives and rotate new challenges in and out as they become more or less effective.

With Turnstile, we adapt the actual challenge outcome to the individual visitor or browser. First, we run a series of small non-interactive JavaScript challenges gathering more signals about the visitor/browser environment. Those challenges include, proof-of-work, proof-of-space, probing for web APIs, and various other challenges for detecting browser-quirks and human behavior. As a result, we can fine-tune the difficulty of the challenge to the specific request and avoid ever showing a visual puzzle to a user.

Turnstile also includes machine learning models that detect common features of end visitors who were able to pass a challenge before. The computational hardness of those initial challenges may vary by visitor, but is targeted to run fast.

https://developers.cloudflare.com/turnstile/

TL;DR A bunch of heuristics that it's hard to spoof all of. Fun side effect of this method is that if you spoof your user agent, you'll often end up locked out in a loop. Lack of a captcha fallback is obnoxious.

[–] [email protected] 5 points 8 months ago

in my experience, you can sometimes get away messing a token or two in the user string as long as it is one of the common ones out there. start injecting BeOS and other arcane values in and things get less reliable.

[–] [email protected] 8 points 8 months ago (1 children)

Incognito / ublock and vpn will often trigger a loop of captcha

[–] [email protected] 5 points 8 months ago* (last edited 8 months ago) (1 children)

I have been stuck in one its hell you will be hoping this will be the last.

[–] [email protected] 4 points 8 months ago

I got stuck in one and couldn't even search for help because each result where people were complaining about it had a captcha preventing me from entering.

[–] [email protected] 6 points 8 months ago (1 children)

also the subtle but not so subtle 'we will fingerprint errrrbody'

so what do they do with that data?

[–] [email protected] 5 points 8 months ago

Sell it to all the bidders.