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In 2005, Yoon et al. proposed a user-friendly remote user authentication scheme using smart cards. The security of their scheme is based on one-way hash function and they claimed that their scheme is secured from attacks and achievable for proving mutual authentication, freely choosing password, no verification tables, and involving very lightweight hashing operations. However, we find that Yoon et...
In 2004, Peyravian et al. presented three simple solutions to X.509 PKI method that these three solutions could save storage, bandwidth and reduce the complexity of the operations. However, we find that Peyravian et al. second scheme suffers from the masquerade attack and this paper will propose a slight improvement to their scheme to resist this weakness.
Grid computing has contributed to advances in computational and communication technologies, which has made economically feasible the conglomeration of multiple clusters of heterogeneous networked resources and services that, in turn, has lead to the development of large-scale distributed systems. However, available resources may be shortage. We propose a secure delivery and billing protocol between...
The electronic election allows voters to vote over the Internet without the geographical restrictions. The mobility, democracy, and privacy are important criteria in evaluating electronic voting schemes. Moreover, researchers have suggested that the supervision of ballot counting is necessary and that electronic voting systems should allow all voters to confirm the result of voting. In the light of...
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