A CAPTCHA is a distorted string of numbers or letters that must be read and typed, acting as a security measure on the World Wide Web. You might have solved a CAPTCHA before in order to gain entry into a secure website such as an email provider, ticket seller, social network, or blog. Now, researchers have modified the basic algorithm behind this online security program to help recognize words from faded texts that computerized optical character recognition programs are unable to decipher.

By AAAS , USA.

Technology Policy Resource.