In 1999, Ham proposed a multisignature scheme with distinguished signing authorities. In Ham's scheme, a malice member easily confuses the signing authorities since individual signatures and multisignatures both generated on the whole document cannot be used as evidence to distinguish the signing authorities. Moreover, Ham' scheme is also not secure against Li et al.'s attack . To provide evidence and remove Li et al.'s attack, a new multisignature scheme with distinguished signing authorities is proposed in this article.
Journal of information science and engineering 19(5), pp.881-887