J Shanghai Jiaotong Univ Sci

Journal of Shanghai Jiaotong University(Science) >

2014 , Vol. 19 >Issue 4: 398 - 405

DOI: https://doi.org/10.1007/s12204-014-1514-6

Efficient and Provably-Secure Certificateless Proxy Re-encryption Scheme for Secure Cloud Data Sharing

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  • (1. Department of Computer Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. School of Science, Hangzhou Normal University, Hangzhou 310000, China; 3. China Information Technology Security Evaluation Center, Beijing 100085, China)

Online published: 2014-10-13

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Abstract

In current cloud computing system, large amounts of sensitive data are shared to other cloud users. To keep these data confidentiality, data owners should encrypt their data before outsourcing. We choose proxy reencryption (PRE) as the cloud data encryption technique. In a PRE system, a semi-trusted proxy can transform a ciphertext under one public key into a ciphertext of the same message under another public key, but the proxy cannot gain any information about the message. In this paper, we propose a certificateless PRE (CL-PRE) scheme without pairings. The security of the proposed scheme can be proved to be equivalent to the computational Diffie- Hellman (CDH) problem in the random oracle model. Compared with other existing CL-PRE schemes, our scheme requires less computation cost and is significantly more efficient. The new scheme does not need the public key certificates to guarantee validity of public keys and solves the key escrow problem in identity-based public key cryptography.

Key words： cloud computing; secure data sharing; proxy re-encryption (PRE); certificateless encryption; key escrow; computational Diffie-Hellman (CDH) problem; random oracle

Cite this article

WANG Liang-liang1* (王亮亮), CHEN Ke-fei2 (陈克非),MAO Xian-ping1 (毛贤平), WANG Yong-tao3 (王永涛) . Efficient and Provably-Secure Certificateless Proxy Re-encryption Scheme for Secure Cloud Data Sharing[J]. Journal of Shanghai Jiaotong University(Science), 2014 , 19(4) : 398 -405 . DOI: 10.1007/s12204-014-1514-6

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