关键词: SSH, 主机认证, 认证服务器

Abstract:

The secure shell protocol(SSH) is a widely used secure protocol.The paper firstly introduces the architecture of SSH and communication process,and analyzes the standard SSH "Trust-on-First-Use" host authentication mechanism and its defects.The notary server mechanism is adopted for host authentication to improve the safety performance of the protocol.Experiments show that this method is simpler,safer and more effective than the conventional ones.

Key words: SSH;host authentication;notary server