Questions tagged [captcha]

Captcha is a type of challenge-response test used in computing as an attempt to ensure that the response is given by a human being and not generated by a computer.

CAPTCHA is an acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart".

A CAPTCHA or Captcha is a type of challenge-response test used in computing as an attempt to ensure that the response is not generated by a computer. The process usually involves one computer (a server) asking a user to complete a simple test which the computer is able to generate and grade.

Because other computers are supposedly unable to solve the CAPTCHA, any user entering a correct solution is presumed to be human. Thus, it is sometimes described as a reverse Turing test, because it is administered by a machine and targeted to a human, in contrast to the standard Turing test that is typically administered by a human and targeted to a machine.

The usual reason for using a CAPTCHA is to prevent automated spam from being posted into a public discussion forum or similar site.

A common type of CAPTCHA requires the user to type letters or digits from a distorted image that appears on the screen. However these are becoming increasing unreliable as the automated spam systems that they are trying to defeat are becoming much better at reading the distorted text. More advanced CAPTCHAs are thus becoming available that require the user to answer more detailed questions or perform more complex actions.

Most CAPTCHAs, particularly the more difficult ones, suffer from accessibility issues. The act of making it difficult for an automated system to read and respond to the CAPTCHA also makes it more difficult for many users with disabilities to access sites that use them. For example, a user who relies on a screen reading web browser may be unable to see the CAPTCHA image. Better CAPTCHA systems will provide solutions to some of these issues, such as an audio alternative, but these users are generally still left at a disadvantage.

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chrome content_shell : stuck in cloudflare challenge

I am studying web browser using chromium content_shell in Linux. I got chromium open source code and build it. I know content_shell is for layout…
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Javascript Captcha

I found this great little code online but it doesn't seem to be comparing the two strings after removing the spaces correctly? I know some js but whatever wrong here is beyond my understanding. Hopefully someone will know the answer to this. Note:…
webmaster alex l
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Using MathCaptcha in MVC 5

I am running MVC5 and am trying to implement CAPTCHA in my web application. I installed CaptchaMvc.Mvc5 (version 1.5.0) and when I try to use the HTMLHelper in my View, it is giving me a red squiggly for this @Html.MathCaptcha() helper method. The…
Ron
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PHP captcha Image

I am using a captcha image verifier in my PHP form. The form uses a cookie to check the verfication code entered by the user. Is there anyother way to do this other than using a cookie?
user787937
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How to pass Cloudflare with python in user's opened tab browser / online?

When I web search I often get an error message, that my browser is acting suspicious and the webpage gives me the cloudflare capcha that I cannot pass, I just left mouse button click on that and it's just stuck in infinite loading loop. As you know…
Lesbian
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Cloudscrape - Cloudflare bypass isn't working

I'm trying to scrape some contents from a website that has cloudflare v2 page (with captcha) with the cloudscrape library in python but also using a paid captcha resolve service like anticaptcha I can't bypass that page and scrape the next one. I'm…
Mopkon
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CaptchaMvc.Mvc5 captcha is not working, when returned to the same page in asp.net

I am using CaptchaMvc.Mvc5 in my application. I am sending captcha and other form details via ajax to controller. If captcha is wrong , then I am returning to the same page from ajax result and not reloading the page from controller. Till this…
Archana
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How to identify the recaptcha type

I'm trying to identify which recaptcha type this website have. https://www.rues.org.co/ Is there a way to identify the recaptcha type dynamically? Thanks!
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Can't reload self-made captcha on the page using JS

Captcha image Captcha image successfully loads…
Dmitry Ponkin
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How we can know if the form entery is added by bot/tool/software or human form having google v2 captcha

We are getting spam entries with vulgar words, How we can know/identify that the entries are submitted by bot or human being. Form is having google v2 captcha Manually check the data added
developer
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Exceeded reCAPTCHA Quota : create new keys

After a month using google's reCaptcha on my website, i received this message Thank you for being a reCAPTCHA user. Your site key is currently using reCAPTCHA over the quota limit of 1 million calls per month. If you do not migrate to reCAPTCHA…
Wildfire
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localhost is not in the list of supported domains for this site key. recaptcha

I have been trying to implement google reCaptcha v3 in my react form ,i am using next js and react 18 , but some how it shows an error like this "localhost is not in the list of supported domains for this site key. recaptcha" , and could't verify…
Vipin N
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Can I save the sound button of Captcha in file .wav?

I'm trying to save a file of a Captcha sound button to turn the sound into a string. I thought of saving it in .wav that is in the HTML in href and then using the speech recogniti module, because I am not getting it just with the sound of the…
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H Captcha on a web page without submit button or callback

I use Python and the selenium libary. My problem is that on the internet page top.gg when you vote there is a H captcha that opens automaitically. The problem is I can't find a callback function. I use 2captcha to get the token. Does anyone have a…
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