本文对蓝牙技术的安全结构作了描述，详细介绍了蓝牙链路层和应用层的安全机制。

This paper presents the bluetooth security architecture, expounding the security system of the link layer and application layer.

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保密以太网卡是将数据加密技术集成到网卡上，对链路层数据提供加密和认证服务的安全设备。

The Secure Ether Network Card, which is a sort of safety, integrates the data encryption technology into the network card and provides the encryption and the authentication services to the link layer.

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本文基于数据链路层地址解析协议ARP的内部工作原理，研究了图书馆网络的安全防范问题。

This paper, by analyzing internal work principle of ARP protocol, researches on security of library network.

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