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In CIS'2006 Li et al proposed a proxy ring signature, which allows proxy signer to sign messages on behalf of the original signer while providing anonymity. At the same conference, Weng et al proposed an ID-based key-insulated signature scheme. In this paper, we point out that the former scheme is not correctly specified. The required hash function H2 should be a map from an elliptic curve to itself...
In 2006, Wu et al proposed a password-based authenticated key exchange protocol. It is considered much more from the practical perspective. There are three hash functions required. In this paper, we revisit and improve it. Our improvement only needs one hash function, without loss of any security. In contrast, the revisited protocol saves about 2/3 memories for the system parameters. The basic idea...
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