A captcha that requires your computer to solve equations in the background

Re:A captcha that requires your computer to solve equations ... by lkwhanspeter on Sunday September 08, 2019 @12:31PM (#20911532)

Other idea: Something like Proof-of-Elapsed-Time. A click on the verify button requests a token from the server. The server performs the action if the token is old enough. -> No battery drain; equal waiting times for all users.

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Re:A captcha that requires your computer to solve equations ... by stri8ed on Sunday September 08, 2019 @12:33PM (#20911540)

Does nothing to filter out bots. It just acts as a rate-limiter per IP address.

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Re:A captcha that requires your computer to solve equations ... by lkwhanspeter on Sunday September 08, 2019 @12:43PM (#20911597)

This is correct, but neither does the WeHateCaptcha approach. Thus spending time is better for the environment then spending energy ;)

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Re:A captcha that requires your computer to solve equations ... by Kiro on Monday September 09, 2019 @01:54AM (#20915531)

No, it filters bots because spammers don't want to waste computing power/electricity. The delay is not the point.

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Re:A captcha that requires your computer to solve equations ... by sp332 on Monday September 09, 2019 @12:05PM (#20919409)

Because a bot can request multiple tickets in a row, then submit them rapidly as they expire. Proof of work means the bot did the work for each request.

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Re:A captcha that requires your computer to solve equations ... by detaro on Sunday September 08, 2019 @12:33PM (#20911545)

Why would that be a problem for an automated system?

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