Network Working Group P. Metzger Request for Comments: 2841 Piermont Category: Historic W. Simpson Obsoletes: 1852 DayDreamer November 2000 IP Authentication using Keyed SHA1 with Interleaved Padding (IP-MAC) Status of this Memo This memo defines a Historic Document for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The Internet Society (2000). All Rights Reserved. Abstract This document describes the use of keyed SHA1 with the IP Authentication Header. Table of Contents 1. Introduction ............................................. 2 1.1. Keys ..................................................... 2 1.2. Data Size ................................................ 2 1.3. Performance .............................................. 3 2. Calculation .............................................. 3 A. Changes .................................................. 5 Security Considerations ....................................... 6 Acknowledgements .............................................. 6 References .................................................... 7 Contacts ...................................................... 8 Editor's Note ................................................. 8 Full Copyright Statement ...................................... 9 Metzger & Simpson Historic