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Comparison of file transfer protocols

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For file sharing software, see Comparison of file-sharing applications. For file synchronization software, see Comparison of file synchronization software.

This article lists communication protocols that are designed for file transfer over a telecommunications network.

Protocols for shared file systems—such as 9P and the Network File System—are beyond the scope of this article, as are file synchronization protocols.

Protocols for packet-switched networks

A packet-switched network transmits data that is divided into units called packets. A packet comprises a header (which describes the packet) and a payload (the data). The Internet is a packet-switched network, and most of the protocols in this list are designed for its protocol stack, the IP protocol suite.

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.

The "Server port" column indicates the port from which the server transmits data. In the case of FTP, this port differs from the listening port. Some protocols—including FTP, FTP Secure, FASP, and Tsunami—listen on a "control port" or "command port", at which they receive commands from the client.

Similarly, the encryption scheme indicated in the "Encryption" column applies to transmitted data only, and not to the authentication system.

Overview

Color key:     International standard     Internet Standard     Proposed Standard     Internet Draft
Protocol Original author First published Protocol suite Standard Refs
Full name Abbreviation
Background Intelligent Transfer Service BITS Microsoft 2001 — No
BitTorrent BT Bram Cohen 2001 — No
CCSDS File Delivery Protocol CFDP 2002 — ISO 17355:2007 (v4)
CCSDS 727.0-B-5
Cross File Transfer CFT — No
Ether File Transfer Protocol EFTP John Shoch 1979 PARC Universal Packet No
Fast and Secure Protocol FASP Ying Xu, Michelle Munson, Serban Simu 2007 — No
File Delivery over Unidirectional Transport FLUTE Internet Society 2004 — RFC 6726
File Service Protocol FSP Wen-King Su 1991 — No
File Transfer Access and Management FTAM ISO 8571-4:1988
File Transfer Protocol FTP Abhay Bhushan 1971 Internet protocol suite RFC 959
FTP Secure FTPS Internet Society 1997 Internet protocol suite RFC 2228, 4217
HTTP Secure HTTPS Taher Elgamal et al. 1995 Internet protocol suite RFC 7230
Host Unix Linkage File Transfer HULFT ? 1993 — No
Hypertext Transfer Protocol HTTP Tim Berners-Lee et al. 1991 Internet protocol suite RFC 7231
Micro Transport Protocol μTP Ludvig Strigeus, Greg Hazel, Stanislav Shalunov, Arvid Norberg, Bram Cohen 2007 — No
Multicast Dissemination Protocol MDP No
Multicast File Transfer Protocol MFTP C. Kenneth Miller et al. 1995 — IETF Draft (1998)
NACK-Oriented Reliable Multicast Transport Protocol NORM RFC 5740
Odette File Transfer Protocol OFTP Organisation for Data Exchange by Tele Transmission in Europe 1986 X.25 RFC 6726
Odette File Transfer Protocol 2 OFTP2 Organisation for Data Exchange by Tele Transmission in Europe 2007 X.25, Internet protocol suite RFC 5024 (V1.3)
Reliable Blast UDP RBUDP Eric He et al. 2002 — No
Remote copy rcp ? 1982 Internet protocol suite No
Secure copy SCP Tatu Ylönen ? Secure Shell No
Secure Hypertext Transfer Protocol S-HTTP IETF Web Transaction Security Working Group 1999 — RFC 2660
Simple Asynchronous File Transfer SAFT Ulli Horlacher 1995 — No
Simple File Transfer Protocol SFTP Mark K. Lottor 1984 — RFC 913
SSH file transfer protocol SFTP Tatu Ylönen c. 1997 Secure Shell IETF Draft (2006)
T.127 T.127 ITU 1995 — ITU T.127
Trivial File Transfer Protocol TFTP Noel Chiappa 1980 Internet protocol suite RFC 1350
Tsunami UDP Protocol Tsunami Mark Meiss et al. 2002 — No
Tus open protocol for resumable file uploads tus Felix Geisendörfer, Marius Kleidl et al. 2014 — No
UDP-based Data Transfer Protocol UDT Yunhong Gu 2004 — No
UDP-based File Transfer Protocol UFTP Dennis Bush 2001 — No
Unix-to-Unix Copy UUCP Mike Lesk 1979 — No
Warp Speed Data Transfer WDT Laurent Demailly et al. 2015 — No

Features

The "Managed" column indicates whether the protocol is designed for managed file transfer (MFT). MFT protocols prioritise secure transmission in industrial applications that require such features as auditable transaction records, monitoring, and end-to-end data security. Such protocols may be preferred for electronic data interchange.

Protocol Encryption
(data)		 Transfer
resuming		 Multicast
capable		 Managed Refs
BITS Optional TLS / AES-128 Yes No No
BitTorrent None Yes Peer-to-peer No
CCSDS File Delivery Protocol (CFDP) {{{1}}} Yes No No
Cross File Transfer (CFT) TLS / SSL Yes
Ether File Transfer Protocol (EFTP) None ? No No
Fast and Secure Protocol (FASP) AES-256 / AES-192 / AES-128 Yes No
File Delivery over Unidirectional Transport (FLUTE) Optional/Unspecified No Yes
File Service Protocol (FSP) None Yes No No
File Transfer Access and Management (FTAM) ?
File Transfer Protocol (FTP) None Yes No No
FTP Secure (FTPS) TLS / SSL Yes No No
HTTP Secure (HTTPS) TLS / SSL Yes No No
Host Unix Linkage File Transfer (HULFT) AES ? No
Hypertext Transfer Protocol (HTTP) None
(see HTTPS and S-HTTP)		 Yes No No
Micro Transport Protocol (μTP) None Yes Peer-to-peer No
Multicast Dissemination Protocol (MDP) None Yes Yes
Multicast File Transfer Protocol (MFTP) None Yes Yes No
NACK-Oriented Reliable Multicast Transport Protocol (NORM) IPsec Yes Yes
Odette File Transfer Protocol (OFTP) None Yes
Odette File Transfer Protocol 2 (OFTP2) TLS Yes
Reliable Blast UDP (RBUDP) None No No
Remote copy (rcp) None No No No
Secure copy (SCP) Secure Shell No No No
Secure Hypertext Transfer Protocol (S-HTTP) CMS / MOSS / other No No No
Simple Asynchronous File Transfer (SAFT) PGP ? No No
Simple File Transfer Protocol (SFTP) None Yes No No
SSH file transfer protocol (SFTP) Secure Shell Yes No No
T.127 None Yes Yes No
Trivial File Transfer Protocol (TFTP) None No No No
Tsunami UDP Protocol None No No No
Tus open protocol for resumable file uploads (tus) Optional/Unspecified Yes No No
UDP-based Data Transfer Protocol (UDT) Experimental No No No
UDP-based File Transfer Protocol (UFTP) AES-256 / AES-128 / 3DES / DES Yes Yes No
Unix-to-Unix Copy (UUCP) None Some No No
Warp Speed Data Transfer (WDT) AES-128 (OFB / CTR) Yes No No
  1. TLS when BITS is used with HTTPS, AES-128 when used with SMB 3, none with HTTP or SMB version below 3.0
  2. Some implementations can obfuscate traffic using RC4 et al. See BitTorrent protocol encryption.
  3. RFC 6726 suggests IPSec as one option.
  4. One implementation, Fujitsu openFT, applies AES.
  5. RFC 1123 (1989) extends and corrects the provisions for restart/resume that were published in RFC 959 (1985). RFC 3659 (2007) provides for resuming in stream mode.
  6. It's recommended to use HTTPS provided by a webserver, proxy, or SSL terminator.
  7. These are the options in the reference implementation, which uses OpenSSL.
  8. The BNU implementation of UUCP can resume an interrupted file transfer.

Ports

In the table below, the data port is the network port or range of ports through which the protocol transmits file data. The control port is the port used for the dialogue of commands and status updates between client and server.

The column "Assigned by IANA" indicates whether the port is listed in the Service Name and Transport Protocol Port Number Registry, which is curated by the Internet Assigned Numbers Authority (IANA). IANA devotes each port number in the registry to a specific service with a specific transport protocol. The table below lists the transport protocol in the "Transport" column.

Protocol Data port Control port Assigned
by IANA		 Assignee Refs
Server Client Transport Server Client Transport
BITS 80/443 / 137-139 TCP / UDP No —
BitTorrent 6881 6881 TCP 6881 6881 TCP No —
CCSDS File Delivery Protocol (CFDP)
Cross File Transfer (CFT) 1761 TCP / X.25
Ether File Transfer Protocol (EFTP) — — None — — None — —
Fast and Secure Protocol (FASP) ≥33001 UDP 22 TCP No —
File Delivery over Unidirectional Transport (FLUTE) 4001 UDP No —
File Service Protocol (FSP) Chosen by user UDP No —
File Transfer Access and Management (FTAM) 4800 / 102 TCP
File Transfer Protocol (FTP) Active mode 20 20 TCP 21 ≥1024 TCP Yes Jon Postel
Passive mode ≥1024 ≥1024
FTP Secure (FTPS) 989 TCP 990 TCP Yes Christopher Allen
HTTP Secure (HTTPS) 443 TCP TCP Yes IESG
Host Unix Linkage File Transfer (HULFT) 30000 TCP TCP No —
Hypertext Transfer Protocol (HTTP) 80 TCP TCP Yes Tim Berners-Lee
Micro Transport Protocol (μTP) UDP No —
Multicast Dissemination Protocol (MDP) Chosen by user UDP
Multicast File Transfer Protocol (MFTP) 5402 UDP Yes Steve Bannister
NACK-Oriented Reliable Multicast Transport Protocol (NORM) UDP
Odette File Transfer Protocol (OFTP) 3305 TCP / X.25 TCP / X.25
Odette File Transfer Protocol 2 (OFTP2) 6619 TCP / X.25 TCP / X.25
Reliable Blast UDP (RBUDP) Chosen by user UDP No —
Remote copy (rcp) 514 TCP TCP Yes
Secure copy (SCP) 22 TCP TCP Yes
Secure Hypertext Transfer Protocol (S-HTTP) 80 TCP TCP No —
Simple Asynchronous File Transfer (SAFT) 487 TCP Yes Ulli Horlacher
Simple File Transfer Protocol (SFTP) 115 TCP TCP Yes Mark Lottor
SSH file transfer protocol (SFTP) 22 TCP TCP Yes
T.127 1503 TCP TCP Yes Jim Johnston
Trivial File Transfer Protocol (TFTP) 69 UDP Yes David Clark
Tsunami UDP Protocol Chosen by user UDP TCP No —
Tus open protocol for resumable file uploads (tus) 80 TCP TCP No —
UDP-based Data Transfer Protocol (UDT) Chosen by server UDP No —
UDP-based File Transfer Protocol (UFTP) 1044 UDP No —
Unix-to-Unix Copy (UUCP) 540 TCP TCP Yes
Warp Speed Data Transfer (WDT) Chosen by server or by user TCP TCP No —
  1. When used with HTTP/HTTPS, configurable
  2. When used with SMB
  3. Typically, if port 6881 is unavailable as a listening port, the peer incrementally tries 6882–6889. Another port may be specified in software.
  4. 1761 is the default port, but 1761–1768 are allocated by IANA.
  5. UDP port 21 is sometimes chosen for FSP.
  6. FTP was originally designed for NCP, a protocol used on ARPANET before the advent of TCP. The TCP implementation of FTP was standardized in RFC 959.
  7. The server listens on TCP port 21 (the control port), and the client sends commands to this port from a random port above 1023. To transfer data in active mode, the server initiates a connection from port 20 to the client at the randomly selected port number.In passive mode, the client uses a random port above 1023 as a control port, and from this initiates file transfer. The server sends or receives data from a randomly selected port above 1023, and the client sends or receives data from one port number above its own randomly selected control port.
  8. Can be chosen by user, but layers on top of HTTP(S) so often 80/443

Serial protocols

A 9-pin to 25-pin RS-232 adapter cable

The following protocols were designed for serial communication, mostly for the RS-232 standard. They are used for uploading and downloading computer files via modem or serial cable (e.g., by null modem or direct cable connection). UUCP is one protocol that can operate with either RS-232 or the Transmission Control Protocol as its transport. The Kermit protocol can operate over any computer-to-computer transport: direct serial, modem, or network (notably TCP/IP, including on connections secured by SSL, SSH, or Kerberos). OBject EXchange is a protocol for binary object wireless transfer via the Bluetooth standard. Bluetooth was conceived as a wireless replacement for RS-232.

Overview

Protocol Author First released License Description Refs
BiModem Erik Labs 1989 Bi-directional transfers.
BLAST Communications Research Group 1981 Powerful protocol originating on the Data General Nova minicomputer, and then ported to micros and mainframes.
C-MODEM Lavio Pareschi 1989 Packet lengths from 32 to 4096 bytes, optional (but normally used) streaming mode.
B protocol CompuServe 1981 Offered file transfer as well as a command stream.
JMODEM Richard B. Johnson ? XMODEM derivative with blocks from 512 to 8192 bytes and RLE compression.
HS/Link Samuel H. Smith 1991
Kermit Frank da Cruz et al. 1981 Open Source (BSD) as of 2011 Transport- and platform-independent transfer of text and binary files across full- or half-duplex connections with conversion of text file formats and character sets.
LeechModem Sam Brown ? Variations of X and Y that faked failed downloads in order to avoid BBS download quotas.
Lynx Matthew Thomas 1989 Similar to Kermit: 64-byte packets, 2 to 16 packets per window, CRC-32. Little or no support outside the Lynx program itself.
NMODEM L. B. Neal 1990 Essentially XMODEM-CRC with 2048 byte blocks.
OBEX File Transfer Protocol ? ? A synchronous file transfer protocol in the OBject EXchange (OBEX) Bluetooth profile.
OBEX Push ? ? An asynchronous file transfer protocol in the OBject EXchange (OBEX) Bluetooth profile.
Punter Steve Punter ? Suite of similar-but-different XMODEM-like protocols for various Commodore machines.
SEAlink Thom Henderson 1986 A MODEM7/XMODEM-compatible protocol with sliding window support developed to avoid propagation delays in satellite transmissions and packet networks.
SMODEM Arisoft ?
TMODEM Mike Bryeans ?
UUCP Mike Lesk 1979 Suite of protocols for copying files between Unix machines, used for many purposes including the distribution of email. Also allows commands to be sent, which led to the first internet worms. The file transfer protocol within UUCP is the "g" protocol.
MODEM7 Mark M. Zeigler, James K. Mills 1980 Slight extension of XMODEM to add filename support and batch transfers.
XMODEM Ward Christensen 1977 Public domain Very simple protocol that saw widespread use and provided the pattern for many following protocols.
WXMODEM Peter Boswell 1986 Public domain Version of XMODEM with sliding windows for higher performance.
YMODEM Chuck Forsberg 1985 Public domain Series of optional expansions on XMODEM for higher performance.
ZMax Mike Bryeans c. 1991 Modifications to ZMODEM to allow packets up to 32 kB in length.
ZMODEM Chuck Forsberg 1986 Public domain Streaming protocol that forsakes XMODEM compatibility but offers a wide variety of new features and improved performance. Became almost universal on BBS systems in the early 1990s.

Features

Protocol Data block size
(bytes)		 Data
compression		 Error detection Transfer
resuming		 Bidirectional Sliding window Refs
BiModem Yes
BLAST 84 - 1024+ RLE CRC Yes Yes Yes
C-MODEM 32–4096 CRC Yes
B protocol 128–2048 CRC32 / CRC16 / 8-bit checksum Yes Yes
JMODEM 64–8192 RLE
HS/Link CRC32 Yes Yes
Kermit ≤9024 (negotiated) RLE (run length encoding, negotiated) Checksum or CRC16 (negotiated) Yes (binary files only, negotiated) No Over full-duplex only (negotiated)
LeechModem
Lynx RLE CRC32 Yes
NMODEM 2048
OBject EXchange
Punter
SEAlink Yes Yes
SMODEM Yes
Tmodem No
UUCP "g" ≤4096 No No
MODEM7 128 No Checksum Stop-and-wait ARQ
XMODEM 128 No Checksum Stop-and-wait ARQ
WXMODEM ≤512 Yes
YMODEM 1024 No CRC16
ZMax ≤~32,768 CRC32
ZMODEM 256 / 1024 No CRC32 Yes Yes

See also

Notes

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  5. US patent 20090063698, Ying Xu, Michelle Christine Munson, Serban Simu, "Method and system for aggregate bandwith control ", issued 30 May 2017, assigned to Aspera, Inc. and IBM 
  6. Paila, Toni; Luby, Michael; Lehtonen, Rami; Roca, Vincent; Walsh, Rod (October 2004). FLUTE - File Delivery over Unidirectional Transport. IETF. doi:10.17487/RFC3926. RFC 3926. Retrieved 7 March 2018.
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  9. Bhushan, Abhay (April 1971). A File Transfer Protocol. IETF. doi:10.17487/RFC0114. RFC 114. Retrieved 24 February 2018.
  10. Horowitz, M.; Lunt, S. (October 1997). FTP Security Extensions. IETF. doi:10.17487/RFC2228. RFC 2228. Retrieved 3 March 2018.
  11. Ford-Hutchinson, Paul (October 2005). Securing FTP with TLS. IETF. doi:10.17487/RFC4217. RFC 4217. Retrieved 3 March 2018.
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References

Further reading

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