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Another security standard has grown in UNIX systems. It’s the SSH family of protocols. Securing remote shell access to UNIX systems is the primary function of SSH. Later, SSH was already extended with file transfer protocol – SCP (in SSH 1) SFTP (in SSH 2). The version 1 of the SSH protocol is already insecure, outdated, and generally not recommended for use. After a while, SCP is not used anymore and SFTP already gained popularity everyday. The abbreviation of “SFTP” is often mistakenly used to relate to a Secure FTP. However, these people often mean “FTPS” – which is the real secured FTP.