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Formal Proofs for the Security of Signcryption

机译:签密安全性的正式证明

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Signcryption is an asymmetric cryptographic method that provides simultaneously both message confidentiality and unforgeability at a low computational and communication overhead. In this paper we propose realistic security models for signcryption, which give the attacker power to choose both messages/signcryptexts as well as recipient/sender public keys when accessing the signcryption/unsigncryption oracles of attacked entities. We then show that Zheng's original signcryption scheme is secure in our confidentiality model relative to the Gap Diffie-Hellman problem and is secure in our unforgeability model relative to a Gap version of the discrete logarithm problem. All these results are shown in the random oracle model.
机译:签密是一种不对称的加密方法,它以低的计算和通信开销同时提供消息机密性和不可伪造性。在本文中,我们提出了用于签密的现实安全模型,该模型使攻击者能够在访问被攻击实体的签密/未签密oracle时选择消息/签密扩展以及接收者/发送者公钥。然后,我们证明,相对于Gap Diffie-Hellman问题,Zheng的原始签密方案在我们的机密模型中是安全的,相对于离散对数问题的Gap版本,在我们的不可伪造模型中是安全的。所有这些结果都显示在随机预言模型中。

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