Secure Shell

Secure Shell, commonly known as SSH or ssh, is a program and protocol that allows a machine to login and execute commands on a remote machine securely. Communication is encrypted, allowing the machines to communicate over insecure networks. The most common implementation is OpenSSH, which is available on many operating systems such as Windows, MacOS, Linux, and BSD.

Many public servers are accessible via SSH, as it is more secure and usually better-supported than the older, unencrypted telnet.

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