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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.
The functionality of the transport layer alone is comparable to Transport Layer Security (TLS); the user-authentication layer is highly extensible with custom authentication methods; and the connection layer provides the ability to multiplex many secondary sessions into a single SSH connection, a feature comparable to BEEP and not available in TLS.
Transport Layer Security (TLS) is a cryptographic protocol designed to provide communications security over a computer network, such as the Internet.The protocol is widely used in applications such as email, instant messaging, and voice over IP, but its use in securing HTTPS remains the most publicly visible.
This is done by sending the "AUTH TLS" command. The server has the option of allowing or denying connections that do not request TLS. This protocol extension is defined in RFC 4217. Implicit FTPS is an outdated standard for FTP that required the use of a SSL or TLS connection. It was specified to use different ports than plain FTP.
The mechanism for negotiating authentication and security with FTP was added under RFC 2228, which included the new FTP command AUTH. While this RFC does not explicitly define any required security mechanisms, e.g. SSL or TLS, it does require the FTPS client to challenge the FTPS server with a mutually known mechanism.
They use one of two transport layer protocols: the Transmission Control Protocol (TCP) or the User Datagram Protocol (UDP). In the tables below, the "Transport" column indicates which protocol(s) the transfer protocol uses at the transport layer. Some protocols designed to transmit data over UDP also use a TCP port for oversight.
FTPS Protocol (data), FTP over TLS/SSL: 990: Yes: FTPS Protocol (control), FTP over TLS/SSL 991: Yes: Netnews Administration System (NAS) [123] 992: Yes: Telnet protocol over TLS/SSL 993: Yes: Assigned: Internet Message Access Protocol over TLS/SSL (IMAPS) [11] 994: Reserved: Previously assigned to Internet Relay Chat over TLS/SSL (IRCS), but ...
SSH File Transfer Protocol, a network protocol used for secure file transfer over secure shell Secure file transfer program, an SSH File Transfer Protocol client from the OpenSSH project; Simple File Transfer Protocol, an unsecured file transfer protocol from the early days of the Internet; Screened fully shielded twisted pair, a kind of ...