Improvement of Threshold Signature Scheme Using Self-Certified Public Key

Recently, Wu and Hsu proposed a threshold signature scheme using the self-certified public key. In their scheme, the authentication of the self-certified individual/group public keys can be confirmed simultaneously in the procedure of verifying the individual/group signatures and their scheme is more efficient than threshold signature scheme designed based on the certificate-based public key systems. In this paper, we show design defect of threshold signature scheme using self-certified public key proposed by Wu and Hsu. Further, we propose an improved threshold signature scheme using self-certified public key, which overcomes disadvantage of Wu and Hsu´s scheme and retains all merits of the original scheme