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We remark that the Wang et al.'s scheme [IEEE Transanction Parallel Distributed Systems, 24 (6), 1172-1181, 2013] fails because the involved homomorphic encryption system is invalid in the context of the scheme. This is due to that the general arithmetic over the field $\mathbb {R}$<alternatives><inline-graphic xlink:type="simple" xlink:href="liu-ieq1-2531669.gif"/></alternatives>...
We put forward a new attack against DES based on the inner relationship Li+1 = Ri. The attack requires about 216 ciphertexts of the same R16, encrypted by the same key K. This attack has a complexity of 255. But from a practical point of view, the requirement for the new attack is more applicable than Differential cryptanalysis, Linear cryptanalysis or Davies' attack.
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...
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