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Recently, Tsai et al. have proposed a multi-server authentication protocol. They claimed their protocol is secure and can withstand various attacks. But we found some security loopholes in the protocol. Accordingly, the current paper demonstrates that Tsaipsilas protocol does not provide perfect forward secrecy and is susceptible to a Denning-Sacco attack and server spoofing. We then present an enhanced...
With the development of application of the peer-to-peer networks, the problem of the privacy preservation has aroused extensive concern. Though many previous researches have focused on the realization of the anonymous communications, these anonymous technologies usually need complex structures which increase the cost of maintenance and the difficulty of management, and prolong the transmission delay...
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