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. Thr...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.展开更多
文摘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.
