Chameleon Hashes Without Key Exposure Based on Factoring  被引量:2

Chameleon Hashes Without Key Exposure Based on Factoring

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作  者:高伟 王学理 谢冬青 

机构地区:[1]School of Mathematics and Econometrics, Hunan University, Changsha 410082, China [2]School of Mathematics Science, South China Normal University, Guangzhou 510631, China [3]School of Computer and Communication, Hunan University, Changsha 410082, China

出  处:《Journal of Computer Science & Technology》2007年第1期109-113,共5页计算机科学技术学报(英文版)

基  金:This work is partially supported by the National Natural Science Foundation of China under Grants No. 10271042 and No. 60373085.

摘  要:Chameleon hash is the main primitive to construct a chameleon signature scheme which provides nonrepudiation and non-transferability simultaneously. However, the initial chameleon hash schemes suffer from the key exposure problem: non-transferability is based on an unsound assumption that the designated receiver is willing to abuse his private key regardless of its exposure. Recently, several key-exposure-free chameleon hashes have been constructed based on RSA assumption and SDH (strong Diffie-Hellman) assumption. In this paper, we propose a factoring-based chameleon hash scheme which is proven to enjoy all advantages of the previous schemes. In order to support it, we propose a variant Rabin signature scheme which is proven secure against a new type of attack in the random oracle model.Chameleon hash is the main primitive to construct a chameleon signature scheme which provides nonrepudiation and non-transferability simultaneously. However, the initial chameleon hash schemes suffer from the key exposure problem: non-transferability is based on an unsound assumption that the designated receiver is willing to abuse his private key regardless of its exposure. Recently, several key-exposure-free chameleon hashes have been constructed based on RSA assumption and SDH (strong Diffie-Hellman) assumption. In this paper, we propose a factoring-based chameleon hash scheme which is proven to enjoy all advantages of the previous schemes. In order to support it, we propose a variant Rabin signature scheme which is proven secure against a new type of attack in the random oracle model.

关 键 词:chameleon signature chameleon hash key-exposure 

分 类 号:TP309[自动化与计算机技术—计算机系统结构]

 

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