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It is a challenging task to construct a signature that it can be tightly reduced to a weak security assumption in the standard model. In this paper, we introduce a simple chameleon-hash-based transformation and show that it can tighten a security reduction of a signature scheme that suffers from a loose security reduction. Taking the Waters’ signature from Eurocrypt 2005 as an example, we demonstrate...
Efficient authentication is one of important security requirements in mobile ad hoc network (MANET) routing systems. However, the digital signature enabled approach is too costly for MANET due to the computation overheads. In addition, due to the diversity of different routing protocols, a universal scheme that suits all MANET routing systems does not exist in the literature. Specifically, an authentication...
In this paper we revisit the security models of certificateless signatures and propose two new constructions which are provably secure in the random oracle model. We divide the potential adversaries according to their attack power, and for the first time, three new kinds of adversaries are introduced into certificateless signatures. They are Normal Adversary, Strong Adversary and Super Adversary (ordered...
Proxy signature is a cryptographic primitive used for delegating the signing rights. The security of most existing proxy signature schemes is based on the complexity assumptions of discrete logarithms and the intractable problems of elliptic curves. While several proxy signature schemes from integer factorization were proposed, unfortunately they cannot resist against the attacks lunched by a malicious...
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