关键词: 门限签名, 门限值, 秘密共享, 动态门限

Abstract: Admission control is the process of mediating every request to admittance and determining whether the request should be granted or denied.This paper presents a dynamic threshold admission control scheme.This scheme changes the threshold （t） by changing the order （t-1） of the secret polynomial f（z） to make the threshold scale with the number of members in the network.In this way，it solves the problem which can’t change the threshold neatly.The scheme not only can audit a new node according to secure requirements and eliminate undesired nodes for P2P networks，but also withstand conspiracy attack that exists in Kim et al’s schemes.

Key words: threshold signature, threshold, secret sharing, dynamic threshold