RFC4009-The SEED Encryption Algorithm

Network Working Group                                            J. Park
Request for Comments: 4009                                        S. Lee
Category: Informational                                           J. Kim
                                                                  J. Lee
                                                                    KISA
                                                           February 2005


                     The SEED Encryption Algorithm

Status of This Memo

   This memo provides information 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 (2005).

Abstract

   This document describes the SEED encryption algorithm, which has been
   adopted by most of the security systems in the Republic of Korea.
   Included are a description of the cipher and the key scheduling
   algorithm (Section 2), the S-boxes (Appendix A), and a set of test
   vectors (Appendix B).

1.  Introduction

1.1.  SEED Overview

   SEED is a 128-bit symmetric key block cipher that has been developed
   by KISA (Korea Information Security Agency) and a group of experts
   since 1998.  SEED is a national standard encryption algorithm in
   South Korea [TTASSEED] and is designed to use the S-boxes and
   permutations that balance with the current computing technology.  It
   has the Feistel structure with 16-round and is strong against DC
   (Differential Cryptanalysis), LC (Linear Cryptanalysis), and related
   key attacks, balanced with security/efficiency trade-off.

   The features of SEED are outlined as follows:

     -  The Feistel structure with 16-round
     -  128-bit input/output data block size
     -  128-bit key length
     -  A round function strong against known attacks
     -  Two 8x8 S-boxes
     -  Mixed operations of XOR and modular addition

   SEED has been widely used in South Korea for confidential services
   such as electronic commerce; e.g., financial services provided in
   wired and wireless communication.

1.2.  Notation

   The following notation is used in the description of the SEED
   encryption algorithm:

      &             bitwise AND
      ^             bitwise exclusive OR
      +             addition in modular 2**32
      -             subtraction in modular 2**32
                  concatenation


            

              
 
                
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