Remarks on Zhang et al.'s Analysis on a Short Signature Scheme and Their Improvement

We first give an analysis on Zhang et al.’s attack on a short signature scheme so called ZCSM scheme and point out their forgery attack is not correct one. Furthermore, we present a forgery attack under the chosen message and public key attacks on ZCSM scheme, in the sense of Zhang et al.’s attack. We also analyze Zhang et al.’s improved signature scheme suggested to resist their attacks and point out the proposed scheme, in fact, does not work properly.