A novel threshold group signature scheme

Threshold signature,a special kind of digital signature,is in popular use.A t out of n threshold signature scheme is a protocol that only t or more than the threshold number members in the group can generate a valid signature,while fewer than t players cannot create a valid signature in the protocol.A new type threshold group signature scheme with the security of the discrete logarithm is proposed based on the block secret sharing scheme.The scheme has some merits in secrecy,public verifiability and pubic delegation.