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I've written about this before, and wrote a proof-of-concept plugin that I dogfood on my own blog: http://www.blahedo.org/botblock/ http://www.blahedo.org/botb

by blahedo 16y ago

I've written about this before, and wrote a proof-of-concept plugin that I dogfood on my own blog: http://www.blahedo.org/botblock/ http://www.blahedo.org/botblock/ Two core ideas: 1) the truly hard thing for the computer is the language understanding. It's the question, not the computation, that's the problem. 2) Any site that becomes popular will be worth it to the spammers to hard-code, so any successful widely-deployed system needs to let the users add their own additional question templates.

solipsist 16y ago
> the truly hard thing for the computer is the language understanding. This does not just apply to understanding language. It applies to understanding and interpreting audio, images, videos, etc. Words and phrases are just the easiest to create in CAPTCHA's, but they are also getting easier for computers to solve. Quite a few of the CAPTCHA's on your blog could be solved by Wolfram Alpha (or at least close to). If it was used in masses, it wouldn't take long for hackers to perfect the process of answering them. > so any successful widely-deployed system needs to let the users add their own additional question templates Couldn't hackers take advantage of entering their own question templates? And relying on user-generated CAPTCHA's is extremely risky. Quality and consistency would drop to a level where the system would became almost useless.