作者
Jian Weng, Robert H Deng, Xuhua Ding, Cheng-Kang Chu, Junzuo Lai
发表日期
2009/3/10
图书
Proceedings of the 4th international symposium on information, computer, and communications security
页码范围
322-332
简介
In a proxy re-encryption (PRE) system [4], a proxy, authorized by Alice, can convert a ciphertext for Alice into a ciphertext for Bob without seeing the underlying plaintext. PRE has found many practical applications requiring delegation. However, it is inadequate to handle scenarios where a fine-grained delegation is demanded. To overcome the limitation of existing PRE systems, we introduce the notion of conditional proxy re-encryption (C-PRE), whereby only ci-phertext satisfying a specific condition set by Alice can be transformed by the proxy and then decrypted by Bob. We formalize its security model and propose an efficient C-PRE scheme, whose chosen-ciphertext security is proven under the 3-quotient bilinear Diffie-Hellman assumption. We further extend the construction to allow multiple conditions with a slightly higher overhead.
引用总数
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学术搜索中的文章
J Weng, RH Deng, X Ding, CK Chu, J Lai - Proceedings of the 4th international symposium on …, 2009