ID-Based Threshold Proxy Signature Scheme Based on Elliptic Curve Cryptosystems

Most of the existing threshold proxy signature schemes were under the certificate-based public key systems. However, in these schemes, some revealed that the receiver cannot find out who signed the proxy signatures. In this paper, based on Schnorr´s signature scheme, integrating the short secret key characteristic of the elliptic curve cryptosystem, we proposed a novel (t, n) threshold proxy signature scheme. Compared with the reported (t, n) threshold proxy signature schemes, our scheme can reduce the amount of computations and communications without a dealer. What´s more, used our scheme, the original signer can know who generated the proxy signature and the receiver can certify the actuality of the group signers.