Efficient Dynamic Threshold Group Signature Scheme Based on Elliptic Curve Cryptosystem

The short secret key characteristic of elliptic curve cryptosystem(ECC) are integrated with the(t,n) threshold method to create a practical threshold group signature scheme characterized by simultaneous signing.The scheme not only meets the requirements of anonymity and traceability of group signature but also can withstand Tseng and Wang’s conspiracy attack.It allows the group manager to add new members and delete old members according to actual application,while the system parameters have a little change.Cryptanalysis result shows that the scheme is efficient and secure.