在现有的关于两部作品研究的基础上，本文旨在从作品主题和结构两方面，对这两部历险记做进一步的分析，探究儿童主人公在作品中的作用。
On the basis of the former critics' research, this thesis attempts to go one step further to explore the roles of the children protagonists in the themes and structures of the two novels.
分析了现有PKI结构的缺陷，并设计了一个改进的公钥证书系统。
We discuss the security of the PKI and propose an improved public key certificate system.
针对现有安全广播协议密钥分发效率较低的问题，提出了一种通过多接收者公钥加密实现安全广播的方法。
To improve the inefficiency of the existing key distribution protocols in the secure broadcasting, an ideal multi-recipient public key encryption scheme to achieve the secret broadcasting is proposed.
针对现有安全广播协议密钥分发效率较低的问题，提出了一种通过多接收者公钥加密实现安全广播的方法。
To improve the inefficiency of the existing key distribution protocols in the secure broadcasting, an ideal multi-recipient public key encryption scheme to achieve the secret broadcasting is proposed.
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