前向安全的密文策略基于属性加密方案

doi:10.3969/j.issn.1000-436x.2014.07.005

Abstract

Abstract:

To mitigate the damage of key exposure in the context of ciphertext-policy attribute-based encryption (CP-ABE). The syntax and security model of forward-secure CP-ABE was presented. Then, a concreted forward-secure CP-ABE scheme was constructed. Under the l-BDHE assumption, the proposed scheme was proved secure in the stan-dard model. Furthermore, the performance of the proposed scheme was discussed in terms of security and efficiency. The results demonstrate that the proposed scheme strengthens the security of CP-ABE, without getting overmuch cost of computation and storage, and thus is more feasible for practical applications.

Key words: forward-secure, key exposure, attribute-based encryption, provable security

EIJiang-hong W,IUWen-fen L,UXue-xian H. Forward-secure ciphertext-policy attribute-based encryption scheme[J]. Journal on Communications, 2014, 35(7): 38-45.

Figures/Tables 1

方案		计算效率			存储/通信效率		前向安全性
方案	加密	解密	私钥更新	系统参数	用户私钥	密文	前向安全性
Waters方案	$(2 l + 2) e$	$(2 l + 1) p + l e$	0	(U+2)G₁+G₂	(\|S\|+2)G₁	$(l + 1) G_{1} + G_{2}$	×
本文方案	$(2 l + 3) e$	$(2 l + 2) p + l e$	O((logT)²) e	(U+l+3)G₁+G₂	(\|S\|+O((logT)²))G₁	$(l + 2) G_{1} + G_{2}$	√

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