Two Kinds of ELGamal Type Digital Multisignature Schemes and Analysis of Their Security

This paper analyzes the ElGamal type digital multisignature schemes put forward by Jianzhu Lu et al.in literatures,points out some errors in the paper and revises them.At the same time,according to their schemes,the paper designs two kinds of ElGamal type Digital Multisignature Schemes.The new scheme is good in security and the practical value is high.