Digital Multi-signature Scheme Based on Schnorr Signature

Two digital multi - signature schemes based on Schnorr signature are proposed, one of which is a sequential digital multi - signature while another one is a broadcasting digital multi -signature. These two schemes have advantages such as the higher security, less computation load and rapid realization. Hence, they may satisfy the requirement of electronic files which should be signed by more than one person, and is especially useful while the smart card is restricted.