Defending websites from malicious intruder bots is not unlike fighting viruses: neutralize them and they reinvent themselves, finding new ways to penetrate. But IT security designers still hold an advantage over some automated ...
Computer Sciences
Apr 6, 2015
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(Phys.org)—Minteye is offering a no-type option to annoying CAPTCHA tests where users' first tries turn into third and fourth tries to get the blurry, blotched letters and digits correct for entry. The company Minteye, ...
If you use the Web, you have probably encountered an annoying invention called a CAPTCHA.
Internet
Jun 15, 2012
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(PhysOrg.com) -- The research team from Stanford University, led by Elie Bursztein, that previously had cracked regular CAPTCHAs and then audio CAPTCHAs, now has also successfully cracked the animated version called NuCaptcha. ...
(PhysOrg.com) -- Stanford researchers say that captcha security codes, asking Internet sign-up users to repeat a string of letters to prove the users are human, can be thwarted, and they have successfully defeated captcha ...
(PhysOrg.com) -- Researchers at the Stanford Security Laboratory create a computer program to defeat audio captchas on website account registration forms, revealing a design flaw that leaves them vulnerable to automated attacks.
Computer Sciences
May 24, 2011
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(PhysOrg.com) -- The combination of simple codes and Captchas, which are even more encrypted using a chaotic process, produces effective password protection.
Computer Sciences
Apr 19, 2011
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Buy something online, enter your credit card number and mailing address. Simple. Then you come to the box with the CAPTCHA, the Completely Automated Public Turing Test to Tell Computers and Humans Apart. Here, the website ...
Computer Sciences
Oct 14, 2010
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We see the popular "captcha" security mechanism often ― wavy letters websites ask us to type into a box. It's used by web pages and newsletter sign-up forms to prevent computer robots from hacking into servers and databases. ...
Computer Sciences
Dec 29, 2009
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While computers can replicate many aspects of human behavior, they do not possess our ability to recognize distorted images, according to a team of Penn State researchers.
Computer Sciences
Sep 9, 2009
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A CAPTCHA ( /ˈkæptʃə/) is a type of challenge-response test used in computing as an attempt to ensure that the response is generated by a person. The process usually involves one computer (a server) asking a user to complete a simple test which the computer is able to generate and grade. Because other computers are assumed to be unable to solve the CAPTCHA, any user entering a correct solution is presumed to be human. Thus, it is sometimes described as a reverse Turing test, because it is administered by a machine and targeted at a human, in contrast to the standard Turing test that is typically administered by a human and targeted at a machine. A common type of CAPTCHA requires the user to type letters or digits from a distorted image that appears on the screen.
The term "CAPTCHA" was coined in 2000 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper, and John Langford (all of Carnegie Mellon University). It is an acronym based on the word "capture" and standing for "Completely Automated Public Turing test to tell Computers and Humans Apart". Carnegie Mellon University attempted to trademark the term, but the trademark application was abandoned on 21 April 2008.
Characteristics: A CAPTCHA is a means of automatically generating challenges which intends to:
A check box in a form that reads "check this box please" is the simplest (and perhaps least effective) form of a CAPTCHA. CAPTCHAs do not have to rely on difficult problems in artificial intelligence, although they can.
This text uses material from Wikipedia, licensed under CC BY-SA
