Questions tagged as 'captcha'

Tagged questions
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How does a CAPTCHA work?

I understand that a CAPTCHA is a way for me to ensure that the user interacting with my system is a human and not a script. But this is the simple explanation we give to lay people. How do CAPTCHAs really work, and what strategies do they use...
asked by 11.07.2017 / 14:29
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How to track letters and cut them?

I have this image below. As you can see, they are together. In this case, it is a "7", "h" and "a". Is it possible to crawl the image to find them and then cut them where exactly you found them? I'm using the OpenCV, OCR, and Tesseract...
asked by 07.08.2017 / 10:49
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Simple National Consultation (by CNPJ)

I'm trying to implement a query of Simple Nacional , the operation is similar to the query by CNPJ of the revenue. Details I've seen so far: After loading the page, it executes a ajax ( file captcha2.js ) that returns 3 ite...
asked by 21.05.2015 / 22:42
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Simple National Consultation (by CNPJ) - C #

I am implementing in C # an Enterprise Query Opting for the Simple National Tax Regime through this link link I have already implemented another similar query (search the cadastral data of the CNPJ informed) and tried to base it on the same...
asked by 29.01.2016 / 20:17
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Validate captcha with PHP

I have a captcha in a form where an image with 5 randomly generated values is displayed. How do I validate the captcha and only send the contact if the value entered in the input is equal to the one generated by the image? Excerpt from the fo...
asked by 21.09.2015 / 20:42
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How to validate Google reCaptcha / noCaptcha in PHP?

How do I submit the POST that Google requests and thus make my field validated?     
asked by 14.05.2015 / 21:32
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Image Verification (Captcha) does not work

My script has a registration form only that captcha does not show the letters: I'llleavethecodebelow:<?phpdefine('SI_IMAGE_JPEG',1);define('SI_IMAGE_PNG',2);define('SI_IMAGE_GIF',3);classSecurimage{var$image_width=190;/***Thedesiredwid...
asked by 04.03.2015 / 15:23
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Validate captcha before sending form

I need a very simple captcha, but it can be validated before the form is sent, how can I do that? I currently use this: index.html <form method="post" action="valida.php" id="form" name="form"> <!-- campos --> <d...
asked by 15.08.2016 / 22:22
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CAPTCHA in stateless API

How to use CAPTCHA in a stateless application? If it is not possible what is the alternative for this?     
asked by 14.01.2015 / 20:49
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Script captcha generator in PHP does not generate the image

I am trying to run the site script below, which generates captcha, but the image is never generated. Can someone give me a light of what I can be doing? I'm running the script via docker. Page: link index.php <!-- No campo src da...
asked by 21.04.2018 / 19:48