Abstract
In a distributed system, there are numerous service provider. The user must be authenticated to entran ce the services provided by the service provider. It is challenging to recall all secret words for users. So to clarify this problem s ingle sign on is used which is an authentication contrivance in that permit a single license to be validated by multiple service provid er. The Wang, Yu, and Qi Xie find that Chang ‐ Lee Scheme undergoes from two attacks one of which is that the aggressor is outside servi ce provider converses with the authenticated user twice and get the license necess ary to right to use data in distributed systems. Th e second attack is the outsider easily receiving right to use to, use services with out any license by mimicking authenticate user. Th is violence also associated with Hsu and Chang Scheme. To sidestep these attacks Wan g, Yu, and Qi Xie employed RSA-VES. For enhancement and soundness of authentication, this paper services One Time Passwo rd to Wang, Yu, and Qi Xie Method. Now a days OTP pimportant role in an authentication, so that using OTP for secure single sign on its easy to provide soundness for authenti cation.
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