Secure file transfer protocol
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The term secure file transfer protocol can refer to both following protocols:
- SSH File Transfer Protocol, a file transfer protocol specifically developed by the IETF to run over secure shell (SSH) connections
- Secure FTP, the practice of running a normal FTP protocol session over SSH (FTP over SSH)
The ambiguity comes from the secure file transfer program (sftp) which is an FTP client using an SSH connection (i.e. FTP over SSH). Then FTP over SSH has been also referred as Secure File Transfer Protocol and abbreviated as SFTP. The command line sftp does not use the SSH File Transfer Protocol.
However, other secure FTP clients, as FileZilla, uses the abreviation SFTP to refer to the SSH File Transfer Protocol.