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CAPTCHAs are one area of computer security where "roll-your-own" can be a good idea. In order to break a CAPTCHA, a bot needs to be programmed to recognize and solve the CAPTCHA. For low-volume, low-value sites, the cost to program a bot to handle even a trivial CAPTCHA such as this is greater than the expected value of breaking it. By the simple ...


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It does stop the most rudimentary bots which repeatedly POST the same form. As you have mentioned, a more sophisticated bot can evaluate the result and append the unique nonce to every request, thus defeating this system.The most sophisticated bots can even go one step further by performing optical character recognition(OCR) on captcha images and input the ...


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Short answer, simple match in clear text is not a CAPTCHA. Read the CAPTCHA wiki to get a better understanding of what defines a CAPTCHA. CAPTCHA Characteristics: CAPTCHAs are by definition fully automated, requiring little human maintenance or intervention to administer. This has obvious benefits in cost and reliability. By definition, the ...


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Firstly, please be reminded, Captcha is used for preventing bot automated submission. I see the spam details are like random words, and I don't think this is an exploitation code or spam ads. I would suggest you to have a research on Captcha, especially the new Captcha released by Google. Captcha in security is kinda chasing game. You build a Captcha ...



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