可證安全的緊致無證書聚合簽密方案
doi: 10.11999/JEIT150407 cstr: 32379.14.JEIT150407
基金項(xiàng)目:
國(guó)家自然科學(xué)基金(61163038, 61262056, 61262057),甘肅省高等學(xué)??蒲许?xiàng)目(2013A-014)和西北師范大學(xué)青年教師科研能力提升計(jì)劃項(xiàng)目(NWNU-LKQN-12-32)
Provable Secure and Compact Certificateless Aggregate Signcryption Scheme
Funds:
The National Natural Science Foundation of China (61163038, 61262056, 61262057)
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摘要: 無證書聚合簽密不僅可以保證信息傳輸?shù)臋C(jī)密性和認(rèn)證性,還可以降低密文的驗(yàn)證和通信開銷。分析現(xiàn)有無證書聚合簽密方案,發(fā)現(xiàn)它們的計(jì)算效率普遍較低。該文提出一個(gè)緊致的無證書聚合簽密方案,方案聚合驗(yàn)證密文信息需要的雙線性對(duì)個(gè)數(shù)固定,并且與簽密用戶個(gè)數(shù)無關(guān)。與已有無證書聚合簽密方案相比,新方案減少了雙線性對(duì)運(yùn)算個(gè)數(shù),提高了聚合驗(yàn)證效率。同時(shí),在隨機(jī)預(yù)言模型下,基于雙線性Diffie-Hellman困難問題和計(jì)算Diffie-Hellman困難問題,證明方案滿足機(jī)密性和不可偽造性。
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關(guān)鍵詞:
- 無證書簽密 /
- 聚合簽密 /
- 雙線性Diffie-Hellman困難問題 /
- 計(jì)算Diffie-Hellman困難問題 /
- 公開驗(yàn)證
Abstract: Certificateless aggregate signcryption not only can ensure the confidentiality and authentication of information transmission, but also can reduce the cost of data communication and the verification of ciphertexts. Through analyzing some existing certificateless aggregate signcryption schemes, it is found that their efficiencies are much lower. A provable secure certificateless compact aggregate signcryption scheme is proposed in this paper. In the new scheme, the pairing numbers, not depending on the number of signcryption users, are constant when aggregate ciphertexts are verified. Compared with the existing certificateless aggregate signcryption schemes, the new scheme decreases pairing numbers and raise the efficiency of verification. Moreover, based on the assumption of bilinear Diffie-Hellman and computational Diffie-Hellman, in the random oracle model, it is proved that the new scheme satisfies the properties of confidentiality and unforgeability. -
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