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Gong, Long, Hong and Chen defined the security model of certificateless aggregate signature schemes for the first time. However, there are some weaknesses exist in their model. In this paper, we point out some drawbacks of the security model of Gong et al.'s and present a new one. A certificateless aggregate signature scheme that is provably secure in our model is also presented. The security of our...
An efficient multi-signature scheme secure in the random oracle model is proposed, which is the first multi-signature scheme with tight security reduction to the hardness of computational Diffie-Hellman (CDH) problem. The scheme only needs the proof-of-possession (POP) key registration assumption to prevent the notorious rogue key attacks and obtain existentially unforgeable security against the adaptively...
Group signature can provide anonymity for signers, and in CIS'2007, Wang et.al. presented an efficient group signature schemes secure in the standard model by combining the HSDH variant signature scheme of Okamoto scheme and NIZK proof techniques used by Boyen and Waters. In this paper, we point out that the scheme in CIS'07 is not unforgeable because of the wrong construction of the HSDH variant...
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