Research on the Validity Duration ofOff-Line E-cash  

作　　者：PENGBing YANGZong-kai WUShi-zhong 

机构地区：[1]DepartmentofElectronicsandInformationEngineering,HuazhongUniversityofScienceandTechnology,Wuhan430074,Hubei,China [2]ChinaNationalInformationSecurityTestingevaluationandCertificationCenter,Beijing100091,China

出　　处：《Wuhan University Journal of Natural Sciences》2004年第6期913-917,共5页武汉大学学报（自然科学英文版）

基　　金：~~

摘　　要：To solve the drawback of the present electionic cash (E-cash) schemes that the size of bank's transcripts database expands without bound, the concept of validity duration of E-cash is introduced in this paper. Through improving the users' blind transforms of Brands' scheme, we design an efficient off-line E-cash system based on the restrictive blind signature and representation problem. The security analysis shows that the users can not forge a valid electronic coin or double spend it, in addition, the bank can not trace an honest users' payment behaviours. In compare with Brand's scheme, our scheme reduces storage costs and computation overhead of the users and the banks. Most of all, the electronic cashes will be authorized within a limit period only, the size of bank's transcripts database becomes controllable. Key words E-cash - restrictive blind signature - validity duration - non-trivial representation - double spending CLC number TP 309.2 Foundation item: Supported by the National Natural Science Foundation of China (90104033)Biography: Peng Bing (1972-), male, Ph. D. candidate, research direction: information security, electronic payment and modern cryptography.To solve the drawback of the present electionic cash (E-cash) schemes that the size of bank's transcripts database expands without bound, the concept of validity duration of E-cash is introduced in this paper. Through improving the users' blind transforms of Brands' scheme, we design an efficient off-line E-cash system based on the restrictive blind signature and representation problem. The security analysis shows that the users can not forge a valid electronic coin or double spend it, in addition, the bank can not trace an honest users' payment behaviours. In compare with Brand's scheme, our scheme reduces storage costs and computation overhead of the users and the banks. Most of all, the electronic cashes will be authorized within a limit period only, the size of bank's transcripts database becomes controllable. Key words E-cash - restrictive blind signature - validity duration - non-trivial representation - double spending CLC number TP 309.2 Foundation item: Supported by the National Natural Science Foundation of China (90104033)Biography: Peng Bing (1972-), male, Ph. D. candidate, research direction: information security, electronic payment and modern cryptography.

关 键 词：E-CASH restrictive blind signature validity duration non-trivial representation double spending 

分 类 号：F830.46[经济管理—金融学]