A Fair Off-Line Electronic Cash Scheme Based on Restrictive Partially Blind Signature  

作　　者：王常吉 吴建平 段海新 

机构地区：[1]Network Research Center,Tsinghua University,Beijing 100084,China

出　　处：《Tsinghua Science and Technology》2004年第4期441-443,481,共4页清华大学学报（自然科学版（英文版）

基　　金：the Post-Doctor Foundation of China (No. 2003033155) and the National Natural Science Founda-tion of China (No. 60203004)

摘　　要：A fair off-line electronic cash scheme was presented based on a provable secure restrictive par-tially blind signature. The scheme is more efficient than those of previous works as the expiry date and de-nomination information are embedded in the electronic cash, which alleviates the storage pressure for the bank to check double spending, and the bank need not use different public keys for different coin values, shops and users need not carry a list of bank抯 public keys to verify in their electronic wallet. The modular exponentiations are reduced for both the user and the bank by letting the trustee publish the public values with different structure as those of previous electronic cash schemes. The scheme security is based on the random oracle model and the decision Diffie-Hellman assumption. The scheme can be easily extended to multi-trustees and multi-banks using threshold cryptography.A fair off-line electronic cash scheme was presented based on a provable secure restrictive par-tially blind signature. The scheme is more efficient than those of previous works as the expiry date and de-nomination information are embedded in the electronic cash, which alleviates the storage pressure for the bank to check double spending, and the bank need not use different public keys for different coin values, shops and users need not carry a list of bank抯 public keys to verify in their electronic wallet. The modular exponentiations are reduced for both the user and the bank by letting the trustee publish the public values with different structure as those of previous electronic cash schemes. The scheme security is based on the random oracle model and the decision Diffie-Hellman assumption. The scheme can be easily extended to multi-trustees and multi-banks using threshold cryptography.

关 键 词：partially blind signature restrictive blind signature fair electronic cash scheme 

分 类 号：TP399[自动化与计算机技术—计算机应用技术]