双向匿名的基于属性的密钥隔离签密

doi:10.3969/j.issn.1000-436x.2013.11.006

Abstract

Abstract:

To solve exposure of secret key in attribute-based signcryption with anonymity for both sender and receiver, key-insulation mechanism to attribute-based signcryption was untroduced.Given the formal definition and security no-tions,the scheme of attribute-based key-insulated signcryption was proposed,which is provably secure under the random oracle model.The improved scheme not only satisfies the requirement of bidirectional anonymity,but also achieves for-ward security and afterward security,consequently reduced the hazard of key exposure.Finally, confidentiality, authenti-cation and anonymity in attribute-based key-insulated signcryption scheme were proved based on given security notions.

Key words: attribute-based signcryption, attribute based, key insulated, key exposure, bidirectional anonymity

Xing-lan ZHANG,Zhen ZHANG. Attribute-based key-insulated signcryption with bidirectional anonymity[J]. Journal on Communications, 2013, 34(11): 42-50.

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References 23

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方案	密文长度	签密运算	解密运算
WEI方案一^[13]	(4d+2)\|G\|+\|m\|+2d\|p\|	(6d+2)Exp+(2d+2)Hash+1Enc	5d Pairing+(d+2)Hash+2Exp+1Dec
本文方案	(4d+4)\|G\|+\|m\|+2d\|p\|	(6d+4)Exp+(2d+2)Hash+1Enc+2H_?	(5d+2)Pairing+(d+2)Hash+2Exp+1Dec

Attribute-based key-insulated signcryption with bidirectional anonymity

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