%0 Journal Article
%T Two Remarks on a Forword-Secure E-cash System<br>关于一个前向安全电子货币系统的两点注记
%A CAO Zheng-Jun
%A <br>曹正军
%J 中国科学院研究生院学报
%D 2006
%I 
%X The paper shows that there are two errors in the E-cash system in Ref.(1]).(1)In the setup phase,the factors p_1,p_2 of modulus n are not published.This makes the user and the bank unable to make valid signatures in the withdrawal phase.(2)The shop M must directly obtain those data(h,h_1,h_2,h_3) used in payment phase in a secure way,instead of receiving them from a signature offered by a user U.Otherwise,the adversary can forge signatures in the payment phase.Therefore,there are four redundant data among the signature(z,a,b,r,j,h,h_1,h_2,h_3) offered by a user.
%K forward-secure
%K electronic cash
%K discrete logarithm problem
%K blind signature
%K redundant data<br>前向安全
%K 电子现金
%K 离散对数问题
%K 盲签名
%K 冗余数据
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=B5EDD921F3D863E289B22F36E70174A7007B5F5E43D63598017D41BB67247657&cid=B47B31F6349F979B&jid=67CDFDECD959936E166E0F72DE972847&aid=2CF6FB12A0E79D99&yid=37904DC365DD7266&vid=EA389574707BDED3&iid=38B194292C032A66&sid=1E9426A299DC9FFD&eid=DA74B62FE4348759&journal_id=1002-1175&journal_name=中国科学院研究生院学报&referenced_num=0&reference_num=7