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Is YouTube the Next Great Authentication Mechanism

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Is YouTube the Next Great Authentication Mechanism

Par Security Bloggers Network
Le [2009-07-14] à 16:16:43



Présentation : Could YouTube provide the next generation of Web security and authentication mechanisms According to a new paper presented at the Symposium of Usable Privacy and Security this week, the millions of homespun videos on the popular social network could provide the foundation for users differentiating themselves from bots and spammers. Many Web sites and blogs require users to authenticate themselves as humans through a mechanism known as CAPTCHA - or Completely Automated Public Turing test to tell Computers and Humans Apart. This is also known as the Human Interactive Proof test. Whatever you call it, CAPTCHA is that last step you re required to complete usually deciphering a string of distorted characters against a noisy background before having a comment posted on blogs or gaining access to online apps. The problem with CAPTCHA is that they re annoying and, oftentimes, not user-friendly. In trying to prevent bots and automated apps from guessing the string of characters, CAPTCHA systems often present users with difficult to read or incomplete strings of words and characters. This leads to errors in the user in authenticating himself as human or a reasonable facsimile of a human . Google s Kurt Alfred Kluever and Rochester Institute of Technology s Richard Zanibbi believe using video CAPTCHA could provide a more secure and easier to use CAPTCHA system that the current text-based methods. The pair conducted tests of video CAPTCHA, in which they pulled ordinary public videos posted by users on YouTube and required users to provide three words that best describe the video. The three words are matched against the tags listed by the video creator. In their paper, Balancing Usability and Security in a Video CAPTCHA, Kluever and Zanibbi claim to have improved the success of human proof from 70 percent for text-based systems to 90 percent with the video system. Likewise, users expressed a higher level of satisfaction and willingness to use the video-based system, even though it took a few seconds longer than the text-based system. A video CAPTCHA is a logical system that is similar to video, icon and picture-based password systems fielded earlier this decade. Those systems replaced conventional text-based client and network password authentication with images that users had to place in the correct order or correctly identify. The idea was that humans can recognize minute differences in facial expressions and characteristics that computers cannot mimic. The systems proved interesting, if not curious, but failed to gain any traction among enterprise users. Kluever and Zanibbi are not suggesting that enterprises rip out their username password network authentication schemas or replace their tokens and certificates with video CAPTCHA. If anything, they re suggesting this type of CAPTCHA could prove a more effective resource and more attack resistant than the current systems that are increasingly vulnerable to brute-force attacks. This is not a foolproof system. Video CAPTCHA - especially those based on YouTube public videos - come with a string of complications. In their tests, Kluever and Zanibbi filtered videos that bordered on obscene or adult content and videos that were too simplistic for use as a CAPTCHA. The video challenges were all conducted in English, which isn t always the best mechanism for the greater multilingual world. And some users complained that while deciphering the video, spelling the correct descriptions wasn t always simple as one of the test participants stated, You overestimate the public s ability to spell. Of course, Kluever and Zanibbi did conduct a series of attacks against their video CAPTCHA, and achieved a 2 percent success rate. The researchers say it is possible to defeat the video CAPTCHA through brute-force attacks against common keywords used by YouTube users. While the initial tests show promise, Kluever and Zanibbi say more testing is required. Before you know it, such systems could become commonplace on Web sites, leveraging the nearly inexhaustible library of user-generated video as an authentication system. Next time you re trying to post a common on a blog, you may be presented with an America s Funniest Home Video of a father being hit in the groin with a Whiffle ball as a challenge to your humanity.

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