ID-based Threshold Blind Signature scheme from Bilinear Pairing

Abstract. Threshold and Blindness are two important properties in cryptography system. They can provide security and privacy. In this paper, We present an efficient construction from Bilin-ear pairing in an ID-based cryptography system. In an ID-based (k, n) threshold blind signature scheme, Private Key Generation Center(PKGC) distributes the secret key to n group members. The user only communicates with the dealer who has collected no less than k valid sub-signatures and computes the group signature. During this process, the signer and the dealer have no infor-mation about the message(blindness). We analyze and prove the security of our scheme. To the best of the author’s knowledge, this is the first ID-based threshold blind signature scheme