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This work is supported by the National Natural Science Foundation of China under Grant No. 90304014 and the National Grand Fundamental Research 973 Program of China under Grant No. 2003CB314805.
The concept of multisignature, in which multiple signers can cooperate to sign the same message and any verifier can verify the validity of the multi-signature, was first introduced by Itakura and Nakamura. Several mu...