SSH is a network protocol for encrypted login between computers. If a user logs in from a local computer to another remote computer using SSH protocol, we can think that this login is safe, and even if it is intercepted in the middle, the password will not be revealed.

At the earliest time, Internet communication was pure text communication. Once intercepted, the content will undoubtedly be exposed. 1995, Finnish scholar Tatuylon designed SSH protocol to encrypt all login information, which became the basic solution of Internet security and quickly became popular all over the world. At present, it has become the standard configuration of Linux system.

SSH is the abbreviation of Secure Shell, which was formulated by IETF's network working group. SSH is a security protocol based on application layer.

SSH is a reliable protocol at present, which provides security for remote login sessions and other network services. Using SSH protocol can effectively prevent information leakage in the process of remote management.

SSH was originally a program on UNIX system, and then it quickly expanded to other operating platforms. SSH, if used properly, can make up for network loopholes. SSH clients are suitable for multiple platforms.

Almost all UNIX platforms-including HP-UX, Linux, AIX, Solaris, DigitalUNIX, Irix and others-can run SSH.