captcha

Does a checbox provide an alternative to using captcha on website? I am thinking i i need to use captcha for user signup. Instead if i put a checkbox for the terms like "By clicking here I agree...." can that solve the bots issues or is captcha required in addition to the checkbox? One thing you can do with a checkbox is to make a honeypot . To do so, you would make a checkbox and hide it with CSS (because bots, as a rule, don't care about CSS). If the box is checked, then it's probably a bot. If you are trying to keep bots from signing up, they will be able to check the checkbox pretty easy.

I do the web page for my local library, and I was thinking it might be kind of appealing to have a "custom" captcha based on book covers. So serve up one of several dozen book covers, and have the patron filling out the form type the book title to prove they're human. Assuming I stripped the title/author info from the image and filename, would that be enough? Would the fact that it was a unique system on a fairly small website be enough to make it effective? Just how tricky are the spam bots these days? Would having the image name be the ISBN # be too obvious? Here is a sample cover: (source:

My knowledge of php is not good and I need help. I have this php form but I don't know how to add a CAPTCHA mechanism. How do I achieve this? I really like Securimage is seems to work really well and does not require a third-party external service or javascript (unless you enable the new image feature). Also it can be configured to provide audio captcha for accessibility. Check this detailed guide about captcha implementation in PHP: http://www.the-art-of-web.com/php/captcha/ 来源： https://stackoverflow.com/questions/2179375/how-do-i-add-a-captcha-to-my-php-form

Vkontakte API rejects requests with Captcha. Here is the example what I do. After the third request I get: Captcha error (14) - Captcha needed. According to documentation it's sufficient to add captcha_sid and captcha_key parameters to the original requests and repeat the request. But the response is still Captcha error (14) . Is it possible to work with Captcha and OAuth in Vkontakte API? Captcha error Error code: 14 Error text: Captcha needed and captcha confirmation is required, when: action (e.g. sending a message) is performed too frequently , an API request may return " Captcha needed "

I have built a website and I want to have an e-mail contact form on the web page, so that someone can send me a message. I am using the code from this website: http://www.w3schools.com/php/php_secure_mail.asp I am using the part that says PHP Stopping E-mail Injections Even though my site gets very few hits per day (like less than 10 visitors) I am finding that I am getting 3 or 4 messages every day from "spammers" who just seem to be sending me random messages that are not related to the subject matter of the website. I am fairly new to all this, so I would like to ask the question: Why is my

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 automatical a before_filter in every controller, which checks, if the current request is via post, put or delete-method. If the user's last post-request is smaller than :min_time, then the request should be redirected to an captcha-input-page (the posted user-data

This question may have been asked already - but unfortunately, I could not find any satisfactory answers. I will just ask it for my concrete case and ask the admins not to delete the question for at least a few days so I can try it out... I have a page. It uses a captcha. Like so: <?php session_start(); // the captcha saves the md5 into the session ?> <img src="captcha.php" onclick="this.src = this.src" /> That was my first code. It did not work, because the browser condsidered it useless to reload an image if the source is the same. My current solution is to pass a get parameter: onclick=

Hi we have just noticed a bunch of Nigerian spam accounts in our email system. Now, we do have a reCaptcha in the signup form but apparently they circumvent it, manually or otherwise. It seems like a semi-manual circumvention since the accounts aren't created in bulk but instead as a steady stream with a few minutes in between. Since most of the spam accounts were created by IP addresses from Nigeria, we have just set up some simple IP filters over a couple of pretty broad IP ranges and that seems to be working for now. However we would like to make a more permanent solution to this problem.