In the most of the existing threshold scheme, a group member can't accomplish signature independently. To this limitation, we propose a new type threshold signature scheme based on Strong-RSA assumption. The prominent trait is that it realizes signing independently and forward security at the same time. The analysis indicated that the scheme has auditability; security problems such as external attack, conspiracy attack also can be solved. Compared with the existing threshold scheme, our scheme is convenient in key distribution, dynamical in adding and deleting group members.
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