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With the popularity of Internet technology, remote user authentication is receiving more and more attention than before. Recently, Awasthi et al. analysed weakness of the timestamp-based authentication scheme proposed by Shen et al. and proposed an improved scheme to prevent its forgery attacks. They claimed that their scheme is secure against forged login attack, provides forward secrecy, and has...
Recently, Khan et al. showed that Wang et al.'s dynamic ID-based remote user authentication scheme is not feasible for real-life implementations such as without preserving anonymity of a user during authentication, user cannot choose the password he/she wants, no provision for revocation of lost or stolen smart card, and can not provide session key agreement. Consequently, an improved version of dynamic...
The conventional user authentication scheme is designed for a single-sever environment. In the case of multiple servers, a user must register with each server individually, and memorize different pairs of identities and passwords to login to each one. This approach is inconvenient and impractical for a multi-server environment. Therefore, various user authentication schemes for multi-server environments...
Recently, Wang et al. proposed a dynamic ID-based remote user authentication scheme using smart cards. They claimed that their scheme preserves anonymity of a user, has the features of strong password chosen by the server, and protected from several attacks. However, in this paper, we point out that Wang et al.'s scheme has practical pitfalls and is not feasible for real-life implementation. We identify...
Remote user authentication scheme is a mechanism which allows a server to authenticate a remote user over insecure channel. Recently, Goriparthi et al. made an enhancement based on Das et al.'s remote user authentication scheme using bilinear pairings. The scheme has the merits of no verification table, freely changing password and preventing the forgery attack and the replay attack. This paper, however,...
An electronic voting system makes it possible for the voters to cast their ballots over the computer network. Hence, voters can participate in elections without having to go to the polling places, which is more convenient and efficient. To design a practical voting scheme, Mu and Varadharajan proposed an anonymous secure electronic voting scheme to be applied over the network in 1998. However, Linet...
In 2007, Shim pointed out that AuthA protocol which is in the process of being standardized by IEEE are vulnerable to chosen protocol attacks and then suggested some coun- termeasures against the attacks. In this paper, we demonstrate another vulnerability of Shim's improved AuthA protocol and then present an improvement to repair the security flaws of the protocol.
Recently, Yang et al. proposed an improvement of two password authentication schemes based on timestamp and nonce. They claimed that their schemes are secure against different kind of attacks. However, we point out that their schemes are vulnerable and can easily be cryptanalyzed. We demonstrate that their schemes perform unilateral authentication (only client authentication) and there is no mutual...
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