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Stanford Research Team Study on Video-Based Captcha Further Supports the Need for Intelligent, Adaptive Captcha Systems
Feb 21, 2012 (06:02 PM EST)

Study Highlights Vulnerabilities and Fixes for Standalone Video-Based Captchas; Reinforces the Strengths of the NuCaptcha Platform and Behavior Analysis System

VANCOUVER, British Columbia, Feb. 21, 2012 /PRNewswire/ -- A Stanford Research Team led by Dr. Elie Bursztein just published new research that shows an algorithm for analyzing motion in a video-based Captcha. This research highlights the importance of NuCaptcha's cloud-based behavior analysis systems and multi-tiered security systems that adjust the security response in real-time. It is important to note: This study relied on specific static features in the implementation of the Captcha, which were previously updated as part of the dynamic NuCaptcha platform. 


"We welcome this type of research which helps to increase the security capabilities of puzzle technology, and is further evidence that Captcha puzzles cannot survive as a security feature in isolation; they need to be part of a larger security construct," stated Christopher Bailey, CTO for NuCaptcha.

Stanford's research can be found here:

How the NuCaptcha Platform Combats Attacks:

NuCaptcha's cloud-based platform measures millions of unique user interactions every day. Each interaction provides information to help better differentiate legitimate users and attackers. As the platform grows, access to behavior information grows, and as a result, so does the intelligence of the platform. In this way, legitimate users are shown easier to solve Captcha puzzles, and higher-risk users are shown puzzles more resistant to OCR style attack.

The NuCaptcha platform deploys a multilayered strategy to defend a website from attack. Three key and patented systems that are involved in this strategy are the Behavior Analysis System (BAS), the Security Measures System (SMS), and the Captcha Puzzle.  The Captcha puzzle is the visible line of defense. It contains various security settings that are adjusted to maximize defense against an attack. Captcha attacks are sophisticated and specific. An attack that works well against one Captcha style is seldom effective against another. By having many security settings available to the Captcha puzzle, the system can deploy an effective Captcha to the user based on the risk or attack seen.

Christopher Bailey further commented, "the combination of animated puzzles and our adaptive Captcha technology allows NuCaptcha to maximize usability for legitimate users while still defending against attackers.  Image based technologies from leading providers such as Google reCaptcha, Yahoo, and Microsoft have been broken time and again, which has resulted in ever harder to solve Captchas for humans.  Animation and adaptive Captchas are two key aspects of preserving both usability and security." Mr Bailey added that "NuCaptcha operates using best practices in the online security space and analyzes each claim of vulnerability which is how we continue to be the most user friendly and secure human authentication platform on the market today."

NuCaptcha works closely with leaders in the field, including Dr. Greg Mori, Associate Professor at Simon Fraser University who has been conducting research in this field for over a decade.

"NuCaptcha represents a new generation of Captcha solutions with an infrastructure designed to adapt to security risks in part by displaying different puzzles when under attack," stated Dr. Mori.

About NuCaptcha

NuCaptcha's mission is to make Captcha a better experience for everyone on the Internet, by replacing highly distorted text "puzzles."  Offering a Captcha solution that is fully customizable, NuCaptcha enables companies to choose how users experience Web security on their sites. The NuCaptcha service currently deploys millions of Captchas a month for a range of enterprise customers.  

Built on The NuCaptcha Security Platform™, the service provides a unique combination of video and intelligent, adaptive security technology that safeguards websites for humans while keeping machines away. NuCaptcha Inc. was founded in 2008 and is based in Vancouver, BC; one of North America's top technology centers. Visit us at


SOURCE NuCaptcha