I'm fascinated by the CAPTCHA system used on SO... I would like to know more about the "many factors" which make reCAPTCHA work. The developers, understandably given the potential for abuse, keep rather quiet about the exact inner workings of their system... But the behavior is well-documented, and so perhaps my curiosity can still be sa...
What is a good invisible captcha? My site requires JavaScript so anything which requires that is fine. ...
If you've made quick edits to answers recently here on SO, you've probably noticed that the captchas have gotten to the point where even a human needs to hit reload several times to find a readable one. It occurs to me that if this level of smudging is required to get past OCR software today, then the day isn't long off where computers...
I would like to write a python script that would generate a 3d captcha like this one: Can you please tell me which graphics librarys I can use? Thanks! Source: ocr-research.org.ua ...
Do I need to create a database table to implement captcha on a registration form? ...
I have implemented a captcha in my form, but it doesn't seem to be validating. I have included code below to see if there is anything obvious in my layout and how I can go about modifying it. Public and private keys have been deleted for the post. Thanks. <h1>Contact</h1> <form action="index.php" method="post"> <input type="hidden" nam...
So, I've implemented ReCaptcha in my ASP.NET MVC application via these instructions: http://devlicio.us/blogs/derik_whittaker/archive/2008/12/02/using-recaptcha-with-asp-net-mvc.aspx My question is, after I've created my reference to my dll, where should I place the DLL in my solution? Should I just make a references folder or ... ? ...
This is probably a lark, but for the recaptcha control as it sometimes takes a long time to render, is this possible? If it takes more than say 5 seconds to render, I'd like to stop the rendering of the object and display my own captcha. I'd start a timer on page load and if 5 seconds has elapsed, in some event in the recaptcha con...
In the blog comments for SO and other blogs, I've noticed a trend in some users posting what the captcha was that they had to solve to get their post accepted. Are they doing this in order to aid captcha-breaking bots? If so, is there a way to programmatically (server-side) compare the users' input to the captcha to strip it out of t...
I have used CAPTCHA on my various web sites in the standard manner where I generated some obfuscated string of characters (odd pair of words, random number, etc.) in an image for the user to manually reproduce in a text box. I am also aware of recaptcha.net which extends the basic functionality of screening bots from humans and as well ...
I have a user registration form in PHP .I put captcha image check in the page.I used it like this //img id="imgCaptcha" src="create_image.php"// and in my javascript i want to validate this with the same number which is generated in the image (from create_image.php page) . That number was set in a session variable too. but when I get...
Hi, Currently I'm wondering if there is a way to post to a website using captcha for a human-check. The following question is asked, ofcourse this is done with random numbers: Type this number in digits; 'twohundredandfive': [ input ] The form is sent using AJAX. So when reloading the website the number to be typed changes. A way to...
When a user submits a form, i'd like to show/redirect to the captcha page intermittently ( based on some custom rules ) and if validated, then execute/commit the first action Is there a way of doing this using the ActionFilter ? or any other way ? ...
I am trying to use Kcaptcha with codeigniter. I created a function in the controller to output the image but the session var is not being set afterwards: controller: function captcha(){ $this->load->library(array('session', 'kcaptcha/kcaptcha')); $this->session->set_userdata('captcha_keystring', $this->kcaptcha->getKeyString())...
Ever visit a website such as myspace where they leverage CAPTCHA to prevent spam? The typical pattern is to present a challenge to each URL that is opened, yet the challenge doesn't actually belong to the page itself which causes additional bandwidth usage. So, if I open up six pages at the same time and want to present a challenge on e...
Reformatted into a question.... Is drag and drop a good catcha method? I.e. would it be a good way of allowing only humans to submit a form? Original text: You can start voting down but i am a newbie and here is my captcha version! The captcha will be based on drag and drop... a human being could implement drag a...
I'm thinking about writing an automatic spam protection system (maybe I will write a public gem) for rails. My concept is to include a helper method in application_controller f.e.: class ApplicationController < ActionController::Base automatic_captcha_redirect(:min_time => 30.seconds :limit => 50) ... end Then I want to include aut...
Already understanding that AES is the encryption method of choice, should existing code that uses DES be re-written if the likely threat is on the level of script kiddies? (e.g. pkzip passwords can be cracked with free utilities by non-computer professionals, so is DES like that?) A quick google search seems to imply that even deprecate...
I am working on my captcha image script, I know the fonts I use are stored on the server end but I am wondering for a high traffic site, does the font size (like kb and mb not dimensions) does it make a difference on the server? Some font's I was messing with are like 4-5mb and then some are under 1mb, is it better to use the smallest ...
I am working on a new captcha script and it is almost completed except I would like to have a list of words for example lets say I have a list of 300 5 letter words that I would like to use for the captcha image text. What would be the best way for performance on a high traffic site to deal with this list for it? Read the words fro...