Monday, December 15, 2008
About CAPTCHA
CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a popular mechanism used in Web sites to ensure humans only are interacting with the security functions of the Web site. CAPTCHA does this by producing images that include embedded numbers and letters that are not easily interpreted by automation tools.
Many hackers attack Web sites by brute force attempting to try the ID and password via programs or automation software. As a definition found in Wikipedia, CAPTCHA is a type of challenge-response test to ensure the user is human. The term CAPTCHA was coined in 2000 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper (all of Carnegie Mellon University), and John Langford (then of IBM). A common type of CAPTCHA requires that the user type the letters or numbers of a distorted image, sometimes with the addition of an obscured sequence of letters or digits that appears on the screen. This technology can reduce the risk of your authentication scheme or customer registration system from being subjected to an automated denial of service operation (whether a legal or illegal operation).
Many hackers attack Web sites by brute force attempting to try the ID and password via programs or automation software. As a definition found in Wikipedia, CAPTCHA is a type of challenge-response test to ensure the user is human. The term CAPTCHA was coined in 2000 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper (all of Carnegie Mellon University), and John Langford (then of IBM). A common type of CAPTCHA requires that the user type the letters or numbers of a distorted image, sometimes with the addition of an obscured sequence of letters or digits that appears on the screen. This technology can reduce the risk of your authentication scheme or customer registration system from being subjected to an automated denial of service operation (whether a legal or illegal operation).
# posted by CHANDU @ 5:38 AM 
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