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Chameleon Hashes Without key exposure Based on Factoring

Journal of Computer Science & Technology 2007年第1期22卷 109-113页

作者：高伟王学理谢冬青 School of Mathematics and Econometrics Hunan University Changsha 410082 China School of Mathematics Science South China Normal University Guangzhou 510631 China School of Computer and Communication Hunan University Changsha 410082 China

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

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Parallel key-insulated Signature: Framework and Construction

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Journal of Shanghai Jiaotong university(Science) 2008年第1期13卷 6-11页

作者：翁健陈克非李祥学刘胜利邱卫东 Department of Computer Science and Engineering Shanghai Jiaotong University School of Information Security Engineering Shanghai Jiaotong University

To deal with the key-exposure problem in signature systems, a new framework named parallel key-insulated signature (PKIS) was introduced, and a concrete PKIS scheme was proposed. Compared with traditional key-insulated signature (KIS) schemes, the proposed PKIS scheme allows a frequent updating for temporary secret keys without increasing the risk of helper key-exposure. Moreover, the proposed PKIS scheme does not collapse even if some (not all) of the helper keys and some of the temporary secret keys are simultaneously exposed. As a result, the security of the PKIS scheme is greatly enhanced, and the damage caused by key-exposure is successfully minimized.

关键词： key-exposure parallel key-insulation signature bilinear pairings random oracle

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IDENTITY-BASED key-INSULATED PROXY SIGNATURE

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Journal of Electronics(China) 2009年第6期26卷 853-858页

作者： Wan Zhongmei Lai Xuejia Weng Jian Liu Shengli Hong Xuan Department of Computer Science and Engineering Shanghai Jiaotong University Shanghai 200240 China Department of Mathematics College of Science Hohai University Nanjing 210098 China Department of Computer Science Jinan University Guangzhou 510632 China

In proxy signature schemes,the proxy signer B is permitted to produce a signature on behalf of the original signer A. However,exposure of proxy signing keys can be the most devastating attack on a proxy signature scheme since any adversary can sign messages on behalf of the proxy signer. In this paper,we applied Dodis,et al.’s key-insulation mechanism and proposed an Identity-Based (ID-based) key-Insulated Proxy Signature (IBKIPS) scheme with secure key-updates. The proposed scheme is strong key-insulated and perfectly key-insulated. Our scheme also supports unbounded period numbers and random-access key-updates.

关键词： key-insulated Proxy signature Identity-based signature key-exposure Bilinear pairings

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