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Based on quantum computation, Zhou et al proposed a quantum encryption scheme in 2006. Each qubit of the ciphertext is constrained to two pairs of conjugate states. So its implementation is feasible with the existing technology. But it is inefficient since it entails six key bits to encrypt one message bit, and the resulting ciphertext for one message bit consists of three qubits. In addition, its...
Group signatures are broadly used to build E-voting, E-binding and fair E-cash systems. In 2004, Boneh et al proposed a short group signature (BBS04) and a group signature with verifier-local revocation (BS04). Both schemes are based on bilinear maps. In this paper, we revisit and improve them. The security of the revisited BBS04 scheme can be directly derived from the improved BS04. Our analysis...
In the common identity-based cryptosystem, a trusted party called the private key generator (PKG), is responsible for generating the secret key for each user's identity. As the PKG knows the secret key for all users, the PKG must be absolutely trustworthy. In a real world scenario, this is not desirable because a malicious PKG can impersonate any user. This is known as the key escrow problem. In EuroPKI'2009,...
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...
In PKC'2004, a constant-round group key exchange protocol is proposed. It takes advantage of the properties of the ElGamal encryption scheme combined with the standard secret sharing technique. In this paper, we show that the scheme can be greatly simplified because the standard secret sharing technique does not work well. Based on the observation, we present a revisited scheme. It saves about 4/5...
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