Cryptanalysis and improvement of some partially blind signature schemes
Yinchun Yang · Jisuanji gongcheng yu sheji · 2012
Some partially blind signature schemes proposed recently are analyzed,and points out that these schemes are not secure as they claimed,and there exists an attack that a requester can change illegally pre-agree common information,and the reason why these schemes suffer from the attack is analyzed.Then,some improvement is proposed to overcome the security drawback of these schemes respectively,and correctness,security and efficiency of these improved schemes are analyzed.The analysis shows that these improved schemes are secure without decreasing efficiency of original schemes.