OpenSSH (Open Source Secure Shell)用于代替rsh实用程序，以便在不安全的通道上提供有安全保障的通信。
OpenSSH (Open Source secure Shell) is intended to replace the RSH utility in order to provide secured communication over insecure channels.
Kerberos协议允许在不安全的计算机网络上通信的计算机节点以一种安全的方式互相验证。
Kerberos protocol allows computer nodes communicating on a non-secure computer network to authenticate each other in a secure manner.
不管连接是安全的还是不安全的，OpenSSL都使用了一个名为BIO的抽象库来处理包括文件和套接字在内的各种类型的通信。
OpenSSL USES an abstraction library called BIO to handle communication of various kinds, including files and sockets, both secure and not.
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