RFC 2612 · INFORMATIONAL · 1999
SUN · 14 JUN 2026
The CAST-256 Encryption Algorithm
Overview
RFC 2612, “The CAST-256 Encryption Algorithm”, is an Informational document published in June 1999 by C. Adams, J. Gilchrist. The canonical text is published by the RFC Editor.
Abstract
This document describes an existing algorithm that can be used to satisfy this requirement. Included are a description of the cipher and the key scheduling algorithm, the s-boxes, and a set of test vectors (Appendix A). This memo provides information for the Internet community.
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 2612 is hosted at rfc-editor.org. Available in TXT,HTML.
Other RFCs from 1999
- RFC 2611 URN Namespace Definition Mechanisms
- RFC 2613 Remote Network Monitoring MIB Extensions for Switched Networks Version 1.0
- RFC 2610 DHCP Options for Service Location Protocol
- RFC 2614 An API for Service Location
- RFC 2609 Service Templates and Service: Schemes
- RFC 2615 PPP over SONET/SDH
- RFC 2608 Service Location Protocol, Version 2
- RFC 2616 Hypertext Transfer Protocol -- HTTP/1.1