Completely Automated Public Turing tests to tell Computers and Humans Apart (CAPTCHA) systems, originally presented distorted text that users had to decipher and input correctly, relying on human ...

How do you let people create user accounts or post comments on your Web site without letting spam bots in? Simple — make your users prove they’re human. Many Web sites use CAPTCHA (Completely ...

Over the years, Google has utilised a number of methods to distinguish between human and bots on the web. Its take on the CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans ...

ReCAPTCHA is a free offering from Google to protect webmasters against robots and bots designed to propagate spam and abuse online services. Based on the Turing Test, reCAPTCHA uses puzzles or logic ...

Google has killed the CAPTCHA by recapturing the simplicity of asking you to tick a check box, but if Google’s API isn’t sure, a reCAPTCHA arises from the dead to mess with your eyes and head in its ...