Multiline Galois Mode (MGM)
draft-smyshlyaev-mgm-02

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Network Working Group                                 S. Smyshlyaev, Ed.
Internet-Draft                                                 CryptoPro
Intended status: Informational                              V. Nozdrunov
Expires: September 5, 2018                                   V. Shishkin
                                                                   TC 26
                                                           March 4, 2018

                      Multiline Galois Mode (MGM)
                        draft-smyshlyaev-mgm-02

Abstract

   Multiline Galois Mode (MGM) is an authenticated encryption with
   associated data block cipher mode based on EtM principle.  MGM is
   defined for use with 64-bit and 128-bit block ciphers.

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   This Internet-Draft will expire on September 5, 2018.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   2
   3.  Basic Terms and Definitions . . . . . . . . . . . . . . . . .   2
   4.  Specification . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  MGM Encryption and Authentication Procedure . . . . . . .   4
     4.2.  MGM Decryption and Authentication Check Procedure . . . .   6
   5.  Rationale . . . . . . . . . . . . . . . . . . . . . . . . . .   7
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .   8
   Appendix A.  Contributors . . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   Multiline Galois Mode (MGM) is an authenticated encryption with
   associated data block cipher mode based on EtM principle.  MGM is
   defined for use with 64-bit and 128-bit block.  The MGM design
   principles can easily be applied to other block sizes.

2.  Conventions Used in This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

3.  Basic Terms and Definitions

   This document uses the following terms and definitions for the sets
   and operations on the elements of these sets:

   V*      the set of all bit strings of a finite length (hereinafter
           referred to as strings), including the empty string;
           substrings and string components are enumerated from right to
           left starting from zero;

   V_s     the set of all bit strings of length s, where s is a non-
           negative integer;

   |X|     the bit length of the bit string X (if X is an empty string,
           then |X| = 0);

   X || Y  concatenation of strings X and Y both belonging to V*, i.e.,
           a string from V_{|X|+|Y|}, where the left substring from
           V_{|X|} is equal to X, and the right substring from V_{|Y|}
           is equal to Y;

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   a^s     the string in V_s that consists of s 'a' bits: a^s = (a, a,
           ... , a), 'a' in V_1;

   (xor)   exclusive-or of the two bit strings of the same length,

   Z_{2^s} ring of residues modulo 2^s;

   MSB_i: V_s -> V_i   the transformation that maps the string X =
           (x_{s-1}, ... , x_0) in V_s into the string MSB_i(X) =
           (x_{s-1}, ... , x_{s-i}) in V_i, i <= s, (most significant
           bits);