mCaptcha – Proof of work based, privacy respecting CAPTCHA system
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Re: mCaptcha – Proof of work based, privacy respecting CAPTCHA system
#2> they will have to generate proof-of-work(a bunch of math that will takes time to compute)
This was tried before and failed! The reason it failed was Maths! Most favour clicking simple images or rearranging visual elements instead of solving Maths problems.
Re: mCaptcha – Proof of work based, privacy respecting CAPTCHA system
#3Hello,
I'm the author of mCaptcha. I'll be happy to answer any questions that you might have :)
Re: mCaptcha – Proof of work based, privacy respecting CAPTCHA system
#4> they will have to generate proof-of-work(a bunch of math that will takes time to compute) This was tried before and failed! The reason it failed was Maths! Most favour clicking simple images or rearranging visual elements instead of solving Maths problems.
The math is performed by the browser. All the user will have to do is tick a checkbox.
Here's a demo: https://demo.mcaptcha.org/widget/?sitekey=pHy0AktWyOKuxZDzFf...
disclosure: I'm the author of mCaptcha
Re: mCaptcha – Proof of work based, privacy respecting CAPTCHA system
#5The goal of CAPTCHA is to tell computers and humans apart. I appreciate the effort towards better UX, but there are already "invisible" CAPTCHAs like Botpoison that discriminate better than this. PoW solutions are just more energy-intensive rate limits.
Re: mCaptcha – Proof of work based, privacy respecting CAPTCHA system
#6It's a good idea. Hopefully it doesn't end in huge server farms wasting energy just for spam!
Re: mCaptcha – Proof of work based, privacy respecting CAPTCHA system
#7Hello, I'm the author of mCaptcha. I'll be happy to answer any questions that you might have :)
Have you considered using a memory hard PoW instead of a computation bound one?
Re: mCaptcha – Proof of work based, privacy respecting CAPTCHA system
#8This is a really intriguing idea. What would stop a spammer from taking the time to get a single token and sharing it among a pool of bots?
Re: mCaptcha – Proof of work based, privacy respecting CAPTCHA system
#9It's a good idea. Hopefully it doesn't end in huge server farms wasting energy just for spam!
It will, or zombies.
Re: mCaptcha – Proof of work based, privacy respecting CAPTCHA system
#10The goal of CAPTCHA is to tell computers and humans apart. I appreciate the effort towards better UX, but there are already "invisible" CAPTCHAs like Botpoison that discriminate better than this. PoW solutions are just more energy-intensive rate limits.
Yes, this feels like an ANTI-CAPTCHA. It's a task that computers can perform dramatically better than humans.