Abstract: Partially blind signature is an important cryptographic primitive in privacy oriented e-commerce applications. In INDOCRYPT 2003, Zhang et al. proposed a new partially blind signature scheme more efficient than previous schemes. It was later showed linkable by Chow et al. and then respectively improved by both Chow et al. and Zhang et al. at the cost of poorer efficiency. However, in this short study we show that the cryptanalysis of Chow et al. is wrong. So the original partially blind signature scheme remains secure and the corresponding improvements are needless.
Wei Gao , Xueli Wang and Dongqing Xie , 2006. Zhang et al.`s Partially Blind Signature Revisited. Asian Journal of Information Technology, 5: 310-311.