关键词: 无线传感器网络, 广播认证, 哈希链, 哈希树, 数字签名, 一次性签名

Abstract: With the summary about ideal properties of broadcast authentication protocols， the performance of proposed broadcast authentication protocols based on digital signature and symmetric cryptography is analyzed. It highlights some mechanisms in these protocols when designing broadcast authentication protocols in wireless sensor networks. The notion of integrality problems of broadcast authentication protocols， meaning relative key management problems of these protocols such as distribution of bootstrap parameters and update of keys， is presented. Furthermore， it also concludes the limitation of existing methods. It’s considered valuable to support multiple security levels for broadcast authentication protocols in wireless sensor networks. A design of such protocols is also proposed.

Key words: wireless sensor networks, broadcast authentication, hash chain, hash tree, digital signature, one time signature