SFTP: The SSH File Transfer Protocol also known as secure file transfer protocol or SFTP is a network protocol that provides file access, file transfer and file management over any reliable data stream.
sftp is a secure form of the ftp command. Whenever a user opens up a regular ftp session or most other TCP/IP connections, the entire transmission made between the host and the user is sent in plain text. Anyone who has the ability to snoop on the network packets can read the data, including the password information. If an unauthorized user can login, they have the opportunity to compromise the system.
When using ssh's sftp instead of the ftp, the entire login session, including transmission of password, is encrypted. It is therefore much more difficult for an outsider to observe and collect passwords from a system using ssh/sftp sessions.
SFTP attempts to be more platform- independent than ftp. SFTP is most often used as subsystem of SSH protocol version 2 implementations, having been designed by the same working group. It is possible, however, to run it over SSH-1 (and some implementations support this) or other data streams. Running an SFTP server over SSH-1 is not platform-independent as SSH-1 does not support the concept of subsystems. An SFTP client willing to connect to an SSH-1 server needs to know the path to the SFTP server binary on the server side.
These are the main security features which are used in every organization who works related to cyber security software solutions and enterprise software development services.
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