Questions tagged [captcha]

An anti-spam technique that was developed to block robots from spamming a site. CAPTCHA works by asking the user to answer a question or solve a problem (such as reading a bit of text in an image) that computers were supposedly incapable of solving but humans were.

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26 views

How exactly does Recaptcha V3 work?

I just learned that Google came out with this new version of Recaptcha that supposedly detects the difference between a human and bot submission without any required input from the human, such as ...
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ReCaptchaNoCaptcha support for VisualEditor in MediaWiki? [closed]

Need help with MediaWiki installation. I successfully installed MediaWiki. Added VisualEditor and Mobilefrontend. With this in place you can edit my site using visual editor but you cannot save it ...
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Is it possible to replace Google's Nocaptcha challenge with distorted letters?

I'm using nocaptcha on a form. It is convenient, since for a lot of users the challenge is not triggered, but for the others the "select street signs/store fronts/vehicles" appears. Is it possible to ...
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Simple Machines Forum site has daily spam registrations despite countermeasures

I have turned on all the spam registration countermeasures in the latest version of SMF for my forum, but am still receiving daily registrations that I believe are spam. How is this happening? They ...
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786 views

Can Googlebot crawl reCAPTCHA v2?

I'm building a website that contains certain forms protected by reCAPTCHA v2. Can Googlebot crawl content protected by its own reCAPTCHA v2?
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47 views

Up-and downsides of a humanoid/common-sense question verification method as replacement of Captcha?

I have thought about my own verification opposed to captcha / digit typing. It would look like this, practically: I am wondering if anyone that brainstorms can think of vulnerabilities of this sort ...
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49 views

Should captcha be used on every vulnerable page, or just on initial page load to deter robots?

I do not know too much about how hackers compromise websites but am careful about sanitizing all posted data. I am using Google ReCaptcha on most of the pages on a website. Would it suffice to have ...
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649 views

Google reCAPTCHA “Type the Text”

I'm currently trying out Google reCAPTCHA and I want the challenges to be "Type the Text" where it will only shows digitized text/numbers and the user will just type what they see on the digitized ...
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237 views

How can I verify the result of a reCAPTCHA in PHP

I am currently working on a website, and I've had some problems with spammers on my comment system. So, I am implementing a reCAPTCHA (maybe some scanners later). I have registered my site with Google,...
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28 views

Is a CAPTCHA more effective than an open ended question such as a math question?

Large company websites often use CAPTCHA to prevent spam. Why are they still using CAPTCHA if security has to be tight? I read somewhere that "In order to prevent spamming more successfully, you ...
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How can I block bots from creating MediaWiki accounts and articles? [duplicate]

I created a new MediaWiki website, Speedypedia. It's currently in alpha in two languages - English and Hebrew. I also submitted my website to MediaWiki's directory of websites using MediaWiki, but ...
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57 views

Clear and concise instructions for an account creation CAPTCHA with MediaWiki?

We get our share spam accounts on our MediaWiki, and we'd like to curb it. According to MediaWiki's Extension:ConfirmAccount: The ConfirmEdit extension can be used (in conjunction with the ...
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322 views

How can I protect my website if services like 2Captcha claim to crack the new reCAPTCHA?

Have recently seen their ad where they claim to be able to do it due to the fact that unlike most OCR CAPTCHA crackers which are bots, they use workforce, humans behind the scenes. Although I still ...
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253 views

How do I secure my site against human spam farm attacks?

I have a Q&A site that has recently been attacked by what I strongly believe to be a human spam farm, as described in these articles: Spammers Pay Others to Answer Security Tests Are You Human? ...
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5k views

Why do “Registration-bots” exist? What do they gain from registering on my site?

I'm curious as i've been developing some anti-bot procedures for a website, only because I see others doing it. But Why?. What do the bots gain from registering hundereds of accounts? I'm building an ...
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Chinese bots in my forum

I have a small community forum that doesn't really get posts or any real traffic. The only thing that happens on the regular is bots with Chinese IPs signing up gibberish usernames. Most bots don't ...
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How secure is a static CAPTCHA?

I have seen some webmasters using a CAPTCHA that doesn't change at all. And many of them use JavaScript to validate these value. For example: if(captchaCode != "4ERJZ") Since most of the web ...
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554 views

Does anyone run a site with Pligg? What is the most effective way to stop spam sign ups? [duplicate]

Possible Duplicate: How can I prevent spam on sites which I control? Specifically trying to combat things like this! http://www.autopliggdotcom (didnt want to give them a link!)
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237 views

Spammers in my Magento blog comment section! [duplicate]

Possible Duplicate: How can I prevent spam on sites which I control? I have a blog extension installed on my Magento website. But I regularly receive spam comments on the blog. To help fight ...
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1answer
634 views

What Captcha Services are available for free?

I'm looking for a free captcha service for a html/css/php site. reCAPTCHA seems to be very famous. Is it effective? Are there maybe other good captcha services which are available for free?
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902 views

Self hosting of recaptcha-like system to digitise my uploaded books

From wikipedia reCAPTCHA is a system ... that uses CAPTCHA to help digitize the text of books while protecting websites from bots I have a lot of scanned documents that I'd like to convert, ...
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4answers
277 views

Removing CAPTCHA is harmful for my forms?

I have some services on my site that developed by PHP , it seems having CAPTCHA in my registration form is decreasing registering users , I tend to remove CAPTCHA at least on my registering form , is ...
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4k views

Is reCaptcha now basically useless?

Is reCaptcha now basically useless? I have read around the internet that reCaptcha has been broken and spam bots can easily overcome it. Has Google addressed this at all. Do they have any plans to ...
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4answers
726 views

Is it good idea to put a captcha on credit card payment form

Is it good idea to put a captcha on credit card payment form? I am thinking to put one on my asp.net mvc application's payment section to make it more secure but I have never seen anybody doing that....
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174 views

Chinese CAPTCHAs

I need to implement a CAPTCHA for a Chinese (Simplified) website. Does anyone know how CAPTCHAs are normally presented on Chinese sites? I have seen some which just display standard decimal numbers ...
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2k views

Which languages are supported by reCAPTCHA?

The documentation states that "Any supported language code." is supported, but then says: Which language is used in the interface for the pre-defined themes. The following languages are supported: ...
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115 views

Why are captcha fields so prevelant across the internet?

Seems to me that they are an easy way out and band aid solution to a problem that could be solved in other ways. I have never implemented a captcha field on a website and do not intend to in the ...
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246 views

Recaptcha statistics

Of late recaptcha images have become excessively difficult to decipher. Is there any way to get analytics on unsuccessful attempts before a successful one for your website? I'm pretty certain the ...
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2k views

How to tell whether spammers are bots or humans?

How can you tell if the people that are spamming your forum or website are in fact bots or human spammers? Please note that the question is not about preventing spammers. It is to determine if the ...
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2answers
131 views

Strange spam posts not making sense [duplicate]

Possible Duplicate: What kind of spam is this? I'm running a web site with a forum where one small part is open for posting from unregistered users. The site uses captcha, but still some spam ...
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66 views

Problematic using Captcha on billing page

I have simple captcha on user page. I want make it refresh if user input incorrect captcha, I just wanna ask Should I do it or I just add a simple button to refresh it.
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852 views

Has anybody earned $0.25+ from each of a captcha (on your website) passing?

I am a real dummy in web monetizing schemes. [ 1 ] informs that a captcha vendor: "charges a fee of about 25 cents to 50 cents for each form that is filled out using a Type-In ad [captcha]... the ...
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292 views

Localized CAPTCHA

What are effective CAPTCHA solutions that can have localized description, and CAPTCHA text itself is either language-neutral, or can be localized (for Polish language)? It is to be used to protect a ...
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492 views

Effective captcha solutions [duplicate]

Possible Duplicate: How can I prevent spam on sites which I control? ReCaptcha is all the rage at the moment, Based on customer/user feedback, what other captcha or general human verification ...