Untraceability analysis of generalized ELGamal type blind signature schemes
Min Yu · Computer Engineering and Applications Journal · 2008
Yao Yi-feng claims that according to his method of affine transform,the strong blind signature scheme is constructed when three blind variables are used,and the weak blind signature scheme is constructed when two blind variables are used.In this paper the authors prove that there is always a set of bind variables that make any two pairs of signed messages related,the blind schemes are always strong no matter two or three blind variables are used.Therefore,Yao Yi-feng's claim is incorrect,and his proof of the untraceability of the blind signature scheme using three blind variables is not very accurate.