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中文摘要：
对邓伦治等提出的高效的基于身份的签密方案进行分析,发现其存在选择性明文攻击。在原方案的基础上,提出了改进的基于身份的签密方案。在随机预言机模型和DLP下证明了方案的机密性和不可伪造性。本文方案比原方案少了一个哈希函数,比原方案更为高效。
英文摘要：
Through the cryptanalysis of efficient identity - based signcryption proposed by Deng et al. Found that the scheme could not resist selective plaintext attack. Based on the original scheme, an improved ID- based sign- cryption scheme was proposed and the scheme was proved to be secure in the random oracle model and under DLP and which was confidentiality and could not be forged, the new scheme was more efficient than the original program which had less a hash function than the original scheme.
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