RFC 2040 · INFORMATIONAL · 1996
TUE · 15 SEP 2026
The RC5, RC5-CBC, RC5-CBC-Pad, and RC5-CTS Algorithms
Overview
RFC 2040, “The RC5, RC5-CBC, RC5-CBC-Pad, and RC5-CTS Algorithms”, is an Informational document published in October 1996 by R. Baldwin, R. Rivest. The canonical text is published by the RFC Editor.
Abstract
This document defines four ciphers with enough detail to ensure interoperability between different implementations. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.
What “Informational” means
Published for the general information of the community. It does not define an IETF standard and carries no standards-track status.
Read this RFC
The canonical text of RFC 2040 is hosted at rfc-editor.org. Available in TXT,HTML.
Other RFCs from 1996
- RFC 2039 Applicability of Standards Track MIBs to Management of World Wide Web Servers
- RFC 2041 Mobile Network Tracing
- RFC 2038 RTP Payload Format for MPEG1/MPEG2 Video
- RFC 2037 Entity MIB using SMIv2
- RFC 2043 The PPP SNA Control Protocol
- RFC 2036 Observations on the use of Components of the Class A Address Space within the Internet
- RFC 2044 UTF-8, a transformation format of Unicode and ISO 10646
- RFC 2035 RTP Payload Format for JPEG-compressed Video