Group signature schemes allow any member of a group to sign message on behalf of the group.In case of dispute

the group manager can reveal the identity of actual signer.Revocation of membership is an important problem in group signature schemes

but among the existing group schemes

there is not any scheme which can safely delete the group member without changing secret keys of the other available group members and the cost of deleting group member is high.A new scheme based on Chinese remainder theorem is proposed in this paper and it has three merits.First

the group manager can safely add or delete members while keeping the secretkeys of the other available members unchanged.Second

only mutiplitation is needed and the length of group center's public keys is unchanged during the revocation.Third

the security of this scheme relies on the factoring of large integers.