RFC 2040 · INFORMATIONAL · 1996
WED · 29 JUL 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.
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