Abstract: An ID-based proactive threshold blind signature scheme is presented. The signer does not know the content signed by himself, and the signed message cannot be tracked. In this scheme, the dishonest private key generator cannot impersonate any user at any time. At the same time the scheme has the property of proactive security, that is, the whole lifetime of the signature is divided into several time periods, and the shares of private key need to be renewed in each time period. However, new shares can construct the same private key as old shares. In the end, it is proved that the scheme is correct, non-forgeable and robust.

Key words: blind signature , bilinear paring, proactive security, threshold signature, ID-based signature