this post was submitted on 24 Jul 2024
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I mean, duh? With proof of work captchas existing, there's no reason to have those image selection captchas... Ever...
How those work is by having the server generate a puzzle. Server side this is cheap to generate, while client side solving is "hard". The server can even choose the difficulty of the puzzle, and even set it dynamically. This means that when your website is under light load the captcha can be really easy/fast to solve. If your website is under attack however the captcha can be set to take seconds to solve.