Design and Implementation of Character CAPTCHA Based on Contraction Mapping

Abstract:

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APTCHA is an important means to improve network security and prevent hackers. Since only a simple transfigure processing and the same style. CAPTCHA are lack of security and have a high rate to be cracked. Hence it is important for network security to design a new method of transfigure having random and complex feature. The paper creates an algorithm using contraction mapping principle and fixed point, with a way of circumvolution and translation. The algorithm randomly select a fixed point in the character picture and make a transfigure using fixed point principle. The experimental results show that the CAPTCHA based on contraction mapping has a strong randomness and difficult to be recognized by computer programs, which can provide a strong security for Web applications.

Info:

Periodical:

Advanced Materials Research (Volumes 341-342)

Edited by:

Liu Guiping

Pages:

731-736

DOI:

10.4028/www.scientific.net/AMR.341-342.731

Citation:

N. Wang "Design and Implementation of Character CAPTCHA Based on Contraction Mapping", Advanced Materials Research, Vols. 341-342, pp. 731-736, 2012

Online since:

September 2011

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Price:

$35.00

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