Analyzing the security of the first proposed dynamitic multilevel key management scheme proposed by Lin in 1997 and showing its fatal that is this can resist backward attack, that is to say, the private key lost will make the new key insecure.

• 对Lin在1997年提出的动态多级密钥管理方案进行了安全性分析,指出了它的一个致命的缺陷:不能抵抗后向攻击,即原来泄漏的密钥将使以后的密钥不再安全。