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'''NuCaptcha''' is an early fraud detection service which utilises behavior analytics to provision threat appropriate, animated video [[CAPTCHA]]s. NuCaptcha is developed and operated by [[Canada]]-based firm NuData Security.<ref name="reg">{{cite web|url=https://www.theregister.co.uk/2010/07/01/animated_captcha/|title=Animated CAPTCHA tech aims to fox spambots|work=[[The Register]]|accessdate=14 July 2010}}</ref><ref (contracted; show full)
[[File:NuCaptcha logo.png|right|frameless|alt=|167x167px|AjayPawar]]

== Technology ==
NuCaptcha attempts to solve usability of static image-based CAPTCHA
Ss using two main technologies: 1) video animation to display CAPTCHA puzzles, and 2) a behaviour analysis system to monitor interactions with the platform.
# Video animation. CAPTCHASs are displayed as a video, and rendered in the web browser.  A variety of technologies can be used to display the animated CAPTCHA, such as Flash video, HTML5, or GIF.  Standard CAPTCHA techniques such as character crowding, once animated, are easier for humans to detect because of an innate motion-detecting ability.
# Behavior Analysis. Using machine-learning algorithms, NuCaptcha monitors platform interactions to tune the security of each CAPTCHA delivered to the user. Suspected attackers are given progressively more secure CAPTCHASs.<ref>{{cite web|url=http://www.readwriteweb.com/archives/nucatpcha_introduces_video_CAPTCHAS_better_securit.php|title=Video CAPTCHAs Promise Better Security, Less Frustration|work=Read, Write, Web|accessdate=30 June 2010}}</ref>

== Security ==
Security researcher [[Elie Bursztein]] demonstrated a practical attack against NuCaptcha's video CAPTCHA scheme by employing [[optical flow]] techniques to isolate individual CAPTCHA characters. The proposed attack is able to break the video CAPTCHAs in more than 90% of cases.<ref name="elinucaptcha">{{cite web|last=Bursztein|first=Elie|title=How we broke the NuCaptcha video scheme and what we propose to fix it|url=http://elie.im/blog/security/how-we-broke-the-nucaptcha-video-scheme-and-what-we-propose-to-fix-it/|accessdate=20 February 2012}}</ref>

In response, NuCaptcha noted that Bursztein’s findings underscore the need for CAPTCHA puzzles to be part of a larger security construct, such as behavior monitoring to assess the risk of individual users. NuCaptcha also pointed out that the CAPTCHASs analyzed in Bursztein's blog post were middle-security puzzles focused on usability, and not the stronger puzzles presented to high-risk users.  In addition to this, NuCaptcha noted that the optical flow technique relies on static non-animated features of the puzzle.  Changes were made to NuCaptcha puzzles to remove the static non-animated features.<ref>{{cite web|url=https://docs.google.com/file/d/0B9OASUKWKndeMmZlZDYzNDEtZjBhOS00N2NhLTgwNGYtMWYyYmJlYzRhNjQ2/edit|title= NuCaptcha’s Thoughts on (contracted; show full)[[Category:Online companies of Canada]]
[[Category:Anti-spam]]
[[Category:Human-based computation]]
[[Category:Turing tests]]
[[Category:Access control software]]
[[Category:Computer security companies]]

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