This is speculation, but based on Google’s reference to the “risk analysis engine” they use (http://googleonlinesecurity.blogspot.com/2014/12/are-you-robot-introducing-no-captcha.html) I would assume it looks at how you behaved prior to clicking, how your cursor moved on its way to the check (organic path/acceleration), which part of the checkbox was clicked (random places, or dead on center every time), … Read more
When you visit a site which is protected by cloudflare, it would contain a security check which you cannot bypass and on failing eventually your access is denied and you are redirected to the captcha challenge page due to the requests from low reputation IP addresses. IP Reputation is calculated based on Project Honeypot, external … Read more
This is a reCAPTCHA (version 2, check out demos here), which is shown to you as the owner of the page does not want you to automatically crawl the page. Your options are the following: Option 1: Stop crawling or try to use an official API As the owner of the page does not want … Read more
Overview: Sorry to be the answerer of bad news, but after research and debugging, it’s pretty clear that there is no way to customize the styling of the new reCAPTCHA controls. The controls are wrapped in an iframe, which prevents the use of CSS to style them, and Same-Origin Policy prevents JavaScript from accessing the … Read more
I notice that almost all the answers here relate to the ineffectiveness of the concept of CAPTCHA, in principle – and while I very much agree with them, in fact gave a talk at OWASP a few months ago explaining just that – the question is very specific, so I will provide for a demonstration. … Read more
With the current version of Recaptcha (reCAPTCHA API version 2.0), you can have multiple recaptchas on one page. There is no need to clone the recaptcha nor try to workaround the problem. You just have to put multiple div elements for the recaptchas and render the recaptchas inside them explicitly. This is easy with the … Read more
In my experience the currently most effective methods are honeypot input fields that are made invisible to users via CSS (best use several different methods, such as visibility:hidden, setting a size of 0 pixels, and absolute positioning far outside the browser window); if they’re filled anyway you can assume it’s a spambot. This blog describes … Read more
To start with using Selenium’s Python clients, you should avoid solving/bypass Google CAPTCHA. Selenium Selenium automates browsers. Now, what you want to achieve with that power is entirely up to individuals, but primarily it is for automating web applications through browser clients for testing purposes and of coarse it is certainly not limited to that. … Read more
My favourite CAPTCHA ever: