Abstract: The author presented a threshold signature scheme with tracking identity. In this scheme, there arc a trusted center named as PKU, a secret dealer, a signature combiner and n members(t ones of these members can take part in (t, n) threshold signature). The traceable identities information not only include information of dealer's identity but also do that of some members identities. We noted that these members take part in threshold signature together. I}he dealer can control production of partial signature and easily revoke the power of member's signature. We can verify whether a par- tial signature is made by some member substituting dealer. Moreover, we can also track the identities of those members who participate in threshold signature.

Key words: Threshold signature, Secret sharing, Signature