M8 (cipher)

M8
General
Designers	Hitachi
First published	1999
Derived from	M6
Cipher detail
Block sizes	64 bits
Structure	Feistel network
Rounds	10

In cryptography, M8 is a block cipher designed by Hitachi in 1999. It is a modification of Hitachi's earlier M6 algorithm, designed for greater security and high performance in both hardware and 32-bit software implementations.

Like M6, M8 is a 10-round Feistel cipher with a block size of 64 bits. The round function can include bit rotations, XORs, and modular addition, but the structure of each round function used is determined by the key. Making these variations key-dependent is intended to make cryptanalysis more difficult (see FROG for a similar design philosophy).

References

"ISO/IEC9979-0020 Register Entry" (PDF). Professor Chris Mitchell, Information Security Group, Royal Holloway, University of London. ISO/IEC 9979 Register of Cryptographic Algorithms.

Hitachi

Divisions and
subsidiaries

Current	Clarion Hitachi Cable Hitachi Cable Manchester Hitachi Canadian Industries Hitachi Capital Hitachi Construction Machinery Hitachi Construction Machinery (Europe) Hitachi Consulting Hitachi Data Systems (BlueArc) Hitachi Electronics Hitachi Maxell Hitachi Medical Systems Hitachi Rail Horizon Nuclear Power JECS

Former	Euclid Trucks¹ Fabrik¹ Hitachi Global Storage Technologies²

Joint ventures and
shareholdings

Products, services
and standards

Current	ALiS D-VHS EMIEW Hitachi Adaptable Modular Storage 2000 Hitachi DX07 Hitachi Starboard Locomotives Hitachi Magic Wand Multiple units Hitachi 917 Hitachi SR8000 Hitachi Travelstar Hitachi TrueCopy LS-R M8 Stacked Volumetric Optical Disk SuperH Universal Storage Platform

Defunct	H8 Family HD64180 HITAC HITAC S-810 Hitachi 6309 Hitachi Deskstar Hitachi Flora Prius Hitachi G1000 Hitachi Hatsukaze Hitachi SR2201 Hitachi T.2 Hitachi TR.1 M6 Microdrive

People

Places

Other

¹Now integrated into other Hitachi divisions or business groupings ²Sold

Category
Commons

Block ciphers (security summary)

Common algorithms	AES Blowfish DES (Internal Mechanics, Triple DES) Serpent Twofish

Less common algorithms	Camellia CAST-128 IDEA RC2 RC5 RC6 SEED ARIA Skipjack TEA XTEA

Other algorithms	3-Way Akelarre Anubis BaseKing BassOmatic BATON BEAR and LION CAST-256 Chiasmus CIKS-1 CIPHERUNICORN-A CIPHERUNICORN-E CLEFIA CMEA Cobra COCONUT98 Crab Cryptomeria/C2 CRYPTON CS-Cipher DEAL DES-X DFC E2 FEAL FEA-M FROG G-DES GOST Grand Cru Hasty Pudding cipher Hierocrypt ICE IDEA NXT Intel Cascade Cipher Iraqi KASUMI KeeLoq KHAZAD Khufu and Khafre KN-Cipher Kuznyechik Ladder-DES Libelle LOKI (97, 89/91) Lucifer M6 M8 MacGuffin Madryga MAGENTA MARS Mercy MESH MISTY1 MMB MULTI2 MultiSwap New Data Seal NewDES Nimbus NOEKEON NUSH PRESENT Prince Q RC6 REDOC Red Pike S-1 SAFER SAVILLE SC2000 SHACAL SHARK Simon SM4 Speck Spectr-H64 Square SXAL/MBAL Threefish Treyfer UES Xenon xmx XXTEA Zodiac

Design	Feistel network Key schedule Lai-Massey scheme Product cipher S-box P-box SPN Avalanche effect Block size Key size Key whitening (Whitening transformation)

Attack (cryptanalysis)	Brute-force (EFF DES cracker) MITM (Biclique attack, 3-subset MITM attack) Linear (Piling-up lemma) Differential (Impossible Truncated Higher-order) Differential-linear Distinguishing (Known-key) Integral/Square Boomerang Mod n Related-key Slide Rotational Timing XSL Interpolation Partitioning Davies' Rebound Weak key Tau Chi-square Time/memory/data tradeoff

Standardization	AES process CRYPTREC NESSIE

Utilization	Initialization vector Mode of operation Padding

Cryptography

History of cryptography Cryptanalysis Outline of cryptography

Symmetric-key algorithm Block cipher Stream cipher Public-key cryptography Cryptographic hash function Message authentication code Random numbers Steganography

Category Portal WikiProject

This article is issued from Wikipedia - version of the 4/22/2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.