What is the best unobtrusive CAPTCHA for web forms? One that does not involve a UI, rather a non-UI Turing test. I have seen a simple example of a non UI CAPTCHA like the Nobot control from Microsoft. I am looking for a CAPTCHA that does not ask the user any question in any form. No riddles, no what's in this image. ...
It looks like we'll be adding CAPTCHA support to Stack Overflow. This is necessary to prevent bots, spammers, and other malicious scripted activity. We only want human beings to post or edit things here! We'll be using a JavaScript (jQuery) CAPTCHA as a first line of defense: http://docs.jquery.com/Tutorials:Safer_Contact_Forms_Without...
What mechanisms do you know that prevent your site from being abused by anonymous spammers. For example, let's say that I have a site where people can vote something. But I don't want someone to spam something all the way to the top. So I found (a) creating an account and only allowed to vote once and (b) CAPTCHA to decrease spam. What ...
Just something simple like showing an image and asking the user to type in the number on the image. ...
Of all the forms of CAPTCHA available, which one is the "least crackable" while remaining fairly human readable? ...
With text-recognition improving and CAPTCHA-breakers using Mechanical Turks to break otherwise unbreakable keys, what's the next technology to keep scripts from spam-botting a site that relies on user input? ...
What is the current state of the art in rails for preventing spam accounts? Captcha? Any good plugins, tutorials or suggestions? ...
What are some popular spam prevention methods besides CAPTCHA? ...
There are lots of non-image-based CAPTCHA ideas floating around. But what about the old-fashioned way? What are the elements of a good image CAPTCHA? What visual elements are hard for computers, but easier for humans? What about mistakes, elements that are easier for computers than they are for humans? What are good techniques for i...
How can I combine the followings to fight spam and at the same time minimize annoyance imposed to the user? In registration page, sending an email to verify the email address In registration page, use CAPTCHA In every post page, use CAPTCHA Feel free to add new items to the list, and please tell your suggested scheme in boolean expre...
What is appropriate way to integrate SpringSecurity with Capcha ? I have following use case : When user will tries to login, if we he failed to login N times, captcha will be displayed, so authentication will be using three parameters : username, password, captcha. But Spring Security doesn't support built in Captcha handling. I just...
I am using the ASP.Net plugin and control provided by reCAPTCHA. I can successfully get the control to work if the submit button on the web form is not in a validationgroup. There is no validationgroup attribute for the reCAPTCHA control. Has anybody had any success with this or any solutions to get the reCAPTCHA control to work when t...
We need to integrate a good CAPTCHA into our CA Siteminder implementation. What is the best CAPTCHA for use with Struts? We've been looking at reCAPTCHA. ...
I'm in the process of adding CAPTCHA validation to one of my websites and need to know what open source solutions exist. Please note strengths and weaknesses and what platform they work with. I'm primarily interested in ASP.NET solutions but feel free to include PHP, Java, etc. ...
What is a CAPTCHA system that is compatible with ASP.NET MVC ? Are there any good examples out there? Thanks. ...
Hello, I'm using reCaptcha in my asp.net 2.0 web application. I'm using onClientClick="return validateForm()" on my submit button. validateForm does basic checking and stops the form from getting to the server if not needed... For some reason, once the user passes the client side validation he always gets Page.IsValid="false"... If ...
I have a problem with the form I'm using in my webpage. It allows the recaptcha but It also sends the email without validating the fields in the recaptcha box. This form is using Ajax and PHP. I've pasted the code next: <br> <br> <div id="fields"> <form action="javascript:alert('success!');"> <label>Nombre</label><INPUT class="textb...
I am writing a website in my spare time for an educational facility and from what I've read on the statistics of this place they seem to have many disabled students studying there. Simply put, I'm setting up an account system where students can log in and receive basic information about their courses, allowing them to comment on their co...
Have any programming methods have been used to defeat reCAPTCHA? I'm interested in seeing evidence and potentially demonstrations that reCAPTCHA in particular has been made obsolete by completely automated, humanless methods. To clarify, not looking for reCAPTCHA-cheating solutions that involve humans in any way, whether teams in India...
[update] I've accepted an answer, as lc deserves the bounty due to the well thought-out answer, but sadly, I believe we're stuck with our original worst case scenario: CAPTCHA everyone on purchase attempts of the crap. Short explanation: caching / web farms make it impossible for us to actually track hits, and any workaround (sending ...