关键词: 移动自组网络 组密钥更新 秘密共享 门限秘密共享

Abstract:

The threshold secret sharing technology is more adaptable to mobile ad hoc networks（MANET） than the centralized group key management protocol and al gorithms in traditional wired networks. It provides efficient and reliable security guarantees for MANET. A secure and efficient group rekeying algorith rn is very important to prevent the members who have left the group from colluding to reconstruct the group key,which is a threat to the security of group communications. In this paper, a rekeying algorithm named NW＇VGRA is proposed which is based on a deep analysis of member collusion behaviors. The a algorithm renews proactively the key share of members while maintaining an unchanged group key, defeats mem- ber collusion attacks,reduces the rekeying 
traffic,and restricts malicious members involved in rekeying.

Key words: mobile ad hoc network;group rekeying;secret sharing, threshold secret sharing