A captcha (/ˈkæp.tʃə/ KAP-chə, originally the acronym CAPTCHA) is a type of challenge–response test used in computing to determine whether the user is...

reCAPTCHA Inc. is a CAPTCHA system owned by Google. It enables web hosts to distinguish between human and automated access to websites. The original version...

one of the pioneers of crowdsourcing. He is the founder of the company reCAPTCHA, which was sold to Google in 2009, and the co-founder and CEO of Duolingo...

of malicious internet bots, AltaVista implemented the first practical CAPTCHA schemes to protect against fraudulent account registrations. They implemented...

security authentication. These include software technologies such CAPTCHA and reCAPTCHA, as well as hardware technologies such as: Radar technology Image...

as keystroke replays and a captcha anticheat that requires users who achieve over 100 wpm in a race to complete a CAPTCHA. When completed successfully...

technique is the use of CAPTCHA. Examples of providers include Recaptcha, Minteye, Solve Media and NuCaptcha. However, captchas are not foolproof in preventing...

reverse CAPTCHA with some accuracy by analysing patterns in the generating engine started being developed soon after the creation of CAPTCHA. In 2013...

OR-Tools PageSpeed Plugin for Eclipse Programmable Search Engine Public DNS reCAPTCHA Schema.org Search Console Sitemaps Swiffy Tesseract (software) Trendalyzer...

impossible) for an attacker to forge the CAPTCHA. This variant of the iTAN is method used by some German banks adds a CAPTCHA to reduce the risk of man-in-the-middle...