这些协议都已经经过加密，使用的是操作系统身份验证方法。

Both of these protocols are encrypted and use the operating systems method of authentication.

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前者(rsh)是一种标准的远程Shell系统，它提供了基本的身份验证安全性，但不提供加密功能，而后者(ssh)提供了基本的身份验证和数据加密功能。

The former, RSH, is a standard remote shell system that offers basic authentication security, but no encryption, while the latter, SSH, offers both authentication and encryption of the data.

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本模型不仅适用于实时的、大数据传输的网络系统，而且实现了密钥管理、加密管理、数字签名以及身份认证等功能。

The model not only realizes key management, encrypted communication, digital signature and identity authentication, but also is fit for network system with real time and large data transfer.

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