Instead of replacing the standard Linux authentication process, the approach used here will introduce another layer of verification based on the user name.

本文中使用的方法不会取代标准的Linux验证过程，而是在用户名的基础上引入另一个验证层次。

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It sets up encryption, integrity verification, and (optionally) compression and exposes to the upper layer an API for sending and receiving plain text packets.

它设置加密、完整性验证和(可选)压缩并向上层公开一个用于发送和接收纯文本数据包的API。

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Data layer realizes data index, data operation and data verification.

实现数据检索、数据操作、数据验证。

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Gmail offers a two-step verification to add an extra layer of security.

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