This work is supported by the National Natural Science Foundation of China under Grant Nos.60673077, 60503006, 60773202,and 60633030;the National Natural Science Foundation of China-Korea Science and Engineering Foundation Joint Research Project(Grant No.60611140543);the National Grand Fundamental Research 973 Program of China(Grant No.2006CB303104).
Restrictive partially blind signature (RPBS) plays an important role in designing secure electronic cash system Very recently, Wang, Tang and Li proposed a neW ID-based restrictive partially blind signature (ID-RPB...