期刊名称：International Journal of Advanced Research In Computer Science and Software Engineering
印刷版ISSN：2277-6451
电子版ISSN：2277-128X
出版年度：2013
卷号：3
期号：10
出版社：S.S. Mishra
摘要：At present day, most peo ple use internet sites to get any type of information and resources and approximately all internet users have login accounts for internet sites to use their resources. For login accounts user must be registered on internet sites and these internet sites requires only registration by human users but unfortunately some automated computer programs enter these sites and use their resources through false registration. This paper introduces RANDOM CAPTCHA. The proposed RANDOM CAPTCHA scheme increases the strength of CAPTCHA and provides strong security to websites from automated computer programs. In this paper we target to change the place randomly of displaying CAPTCHA and CAPTCHA automatically after a predefined fixed time (few seconds) again and again without refreshing whole webpage. CAPTCHA refreshes cod e and changes place randomly itself until the final CAPTCHA is filled by user. Now, automated computer program s have more difficulties to break the CAPTCHA. The proposed RANDOM CAPTCHA scheme restricts automated computer programs to illegal access to any resource.
关键词：CAPTCHA; Time-Variant CAPTCHA; Random Number Generator; System Clock; ASP.NET
