Aussie-Sino Studies

2017, (1) P97-P104

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A New Chosen Ciphertext Secure Certificateless Threshold Decryption Scheme from Pairing

Zhu Jun

摘要(Abstract):

In distributed systems threshold cryptosystems are important to avoid single point of failure. This paper studies threshold decryption in the context of Certificateless Public Key Cryptography, aiming to avoid costly management of certificate in Public Key Infrastructure and settle the matter of key escrow in Identity-Based Cryptography. Combining Paterson and Al-Riyami’s security model of certificateless encryption schemes with the notion of threshold cryptography, an improved certificateless threshold decryption structure is constructed. Furthermore, we present a new security model concerning certificateless threshold decryption schemes. Compared with previous studies, our study is more generic and effective because of less requirement of broadcast information. The new scheme which consists of ten algorithms can not only remove the problem of the centralization of decryption power by means of distributing the power among several servers, but also be proved secure in the proposed adaptive adversarial model. Security proof can be presented under the condition of hard computation of a problem in relation to Bilinear Diffie-Hellman Problem in the random oracle model.

关键词(KeyWords): threshold decryption, certificateless public key cryptography, adaptive chosen-ciphertext attack, bilinear map

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基金项目(Foundation): Project supported by natural science foundation of the colleges and universities in Jiangsu Province (No. 16KJB520019) and scientific research foundation of Nanjing University of Science and Technology Zijin College.

作者(Author): Zhu Jun

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