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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 Canadian-based firm, NuData Security.〔(【引用サイトリンク】title=Animated CAPTCHA tech aims to fox spambots )〕〔(【引用サイトリンク】title=NuCaptcha Flash CAPTCHAs to combat spambots )〕〔(【引用サイトリンク】title=Spammers to Face Video CAPTCHA Technology - Security from eWeek )〕〔(【引用サイトリンク】url=http://agendabuilder.gartner.com/SEC19/webpages/VendorDetail.aspx?Vendor=96 )〕 Static image-based CAPTCHAs are routinely used to prevent automated sign-ups to websites by using text or images of words disguised so that optical character recognition (OCR) software has trouble reading them.〔 However, in common CAPTCHA systems, users often fail to correctly solve the CAPTCHA 7% - 25% of the time. NuCaptcha uses animated video technology that it claims make puzzles easier for humans to solve, but harder for bots and hackers to decipher.〔 == Technology == NuCaptcha attempts to solve usability of static image-based CAPTCHAS 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. CAPTCHAS 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 CAPTCHAS.〔(【引用サイトリンク】title=Video CAPTCHAs Promise Better Security, Less Frustration )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「NuCaptcha」の詳細全文を読む スポンサード リンク
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