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Identity-based crypto system has many advantages over PKI-based cryptosystem in key distribution, but key escrow is always an inherent drawback. In order to solve the problem, certificateless public key cryptography was introduced by Al-Riyami and Paterson in [8]. In this paper, we first introduce a certificateless signature scheme secure against both malicious PKG attack and DOD attack without random...
Wireless communications offer organizations and users many benefits such as portability and flexibility, but the messages transfer is limited by the power and the bandwidth. So the compactness of messages is necessary. One of the compactness is aggregate signatures, which is a single short string that convinces any verifier that for all 1 les i les n, signer Si signs message Mi, where the n signers...
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