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UpdatedPROPOSED STANDARDIETF stream

RFC 4253: The Secure Shell (SSH) Transport Layer Protocol

Still current, but amended. Parts of this document are changed or extended by RFC 6668, RFC 8268, RFC 8308, RFC 8332, RFC 8709, RFC 8758, RFC 9142. Read both.

In plain English — editorial summary, not part of the RFC

The Secure Shell (SSH) is a protocol for secure remote login and other secure network services over an insecure network. This document describes the SSH transport layer protocol, which typically runs on top of TCP/IP. The protocol can be used as a basis for a number of secure network services. It provides strong encryption, server authentication, and integrity protection. It may also provide compression. Key exchange method, public key algorithm, symmetric encryption algorithm, message authentication algorithm, and hash algorithm are all negotiated. This document also describes the Diffie-Hellman key exchange method and the minimal set of algorithms that are needed to implement the SSH transport layer protocol. [STANDARDS-TRACK]

Document record

Document ID
RFC4253
Published
January 2006
Authors
T. Ylonen; C. Lonvick
Status
PROPOSED STANDARD
Stream
IETF
Area
sec
Pages
32
Also known as
—
Updated by:
RFC 6668, RFC 8268, RFC 8308, RFC 8332, RFC 8709, RFC 8758, RFC 9142

Topics

Referenced by

7 later RFCs formally update or obsolete part of this document.

Related documents

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About this page

The document record above — title, authors, date, status, stream, area, relationships, DOI and errata — is imported verbatim from the public RFC Editor index. The “in plain English” section is editorial: written by The metasystema editorial team, not part of the RFC. Where the two differ, the RFC text governs.

Last checked against the RFC Editor index on . RFCs are never revised after publication; changes are issued as new documents.

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canonical URL: /rfc/4253-the-secure-shell-ssh-transport-layer-protocol