FTPS is a name used to encompass a number of ways in which FTP software can perform secure file transfers. Each way involves the use of a SSL/TLS layer below the standard FTP protocol to encrypt the control and/or data channels. It should not be confused with SSH file transfer protocol. FTP may refer to: File Transfer Protocol Foiled Twisted Pair This is a disambiguation page — a list of articles associated with the same title. ... Secure Sockets Layer (SSL) and Transport Layer Security (TLS), its successor, are cryptographic protocols which provide secure communications on the Internet. ... In computing, the SSH File Transfer Protocol or SFTP is a network protocol that provides file transfer and manipulation functionality over any reliable data stream. ...
The two most common uses of FTP and SSL are:
AUTH TLS, or Explicit FTPS, named for the command issued to indicate that TLS security should be used. This is the preferred method according to the RFC defining FTP over TLS. The client connects to the server port 21 and starts an unencrypted FTP session as normal, but requests that TLS security be used and performs the appropriate handshake before sending any sensitive data.
Implicit FTPS is an older style in which the client connects to a different port (usually 990), and an SSL handshake is performed before any FTP commands are sent.
In internetworking and computer network engineering, Request for Comments (RFC) documents are a series of memoranda encompassing new research, innovations, and methodologies applicable to Internet technologies. ... Implicit FTPS is an older style of FTPS in which the client connects to a different port (usually 990), and an SSL handshake is performed before any FTP commands are sent. ...
In computing, the SSH File Transfer Protocol or SFTP is a network protocol that provides file transfer and manipulation functionality over any reliable data stream. ...
Some of the terminology is very specific to the FTP model; some readers may wish to turn to the section on the FTP model while reviewing the terminology.
This current edition of the FTP specification is intended to correct some minor documentation errors, to improve the explanation of some protocol features, and to add some new optional commands.
At the initiation of the user, standard FTP commands are generated by the user-PI and transmitted to the server process via the control connection.
FTP is an 8-bit client-server protocol, capable of handling any type of file without further processing, such as MIME or Uuencode.
However, FTP has extremely high latency; that is, the time between beginning the request and starting to receive the required data can be quite long, and a sometimes-lengthy login procedure is required.
It is hard to filter active mode FTP traffic on the client side by using a firewall, since the client must open a random port in order to make the connection.
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