Difference between revisions 477965577 and 477966478 on enwiki

{{Orphan|date=August 2011}}

'''NuCaptcha''' is a [[Canada|Canadian]]-based [[CAPTCHA]] service utilizing animated video CAPTCHAs.<ref name="reg">{{cite web|url=http://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 name="theh">{{cite web|url=http://www.h-online.com/security/news/item/NuCaptcha-Flash-CAPTCHAs-to-combat-spambots-1032147.html|title=NuCaptcha Flash CAPTCHAs to combat spambots|accessdate=14 July 2010}}</ref><ref name="eweek">{{cite web|url=http://www.eweek.com/c/a/Security/Company-Looks-to-Slow-Spammers-With-Video-CAPTCHA-Technology-127193/|title=Spammers to Face Video CAPTCHA Technology - Security from eWeek|work=[[eWeek]]|accessdate=14 July 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>{{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>.⏎

== References ==
{{reflist}}

== External links ==
* [http://www.nucaptcha.com/ NuCAPTCHA homepage]



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[[Category:Internet companies of Canada]]