Spectr-H64

Spectr-H64
General
Designers	N.D. Goots, A.A. Moldovyan and N.A. Moldovyan
First published	2001
Successors	CIKS-1
Cipher detail
Key sizes	256 bits
Block sizes	64 bits
Structure	Feistel-like network
Rounds	12
Best public cryptanalysis
Slide attack using 2¹⁷ chosen plaintexts

In cryptography, Spectr-H64 is a block cipher designed in 2001 by N. D. Goots, A. A. Moldovyan and N. A. Moldovyan. It relies heavily on the permutation of individual bits, so is much better suited to implementation in hardware than in software.

The algorithm has a block size of 64 bits and key size of 256 bits. It uses a 12 round structure in which half of the block determines the transformation of the other half in each round, similar to a Feistel cipher or RC5. This same basic design was repeated in its successor, CIKS-1.

Cryptanalysis

An analysis of Spectr-H64 was presented in 2002 by Selçuk Kavut and Melek D Yücel of the Middle East Technical University, showing a method of using a differential attack to retrieve half of the key bits when a single round is used. Using this method, they then presented a slide attack that requires 2¹⁷ chosen plaintexts to return all key bits on the full 12 rounds.

References

Selçuk Kavut and Melek D. Yücel (2002). Slide Attack on Spectr-H64 (PDF). 3rd International Conference on Cryptology in India (Indocrypt 2002). Springer. doi:10.1007/3-540-36231-2_4. ISBN 9783540002635.

Youngdai Ko, Deukjo Hong, Seokhie Hong, Sangjin Lee, and Jongin Lim (2003). "Linear Cryptanalysis on SPECTR-H64 with Higher Order Differential Property". Computer Network Security. Springer. pp. 298–307. doi:10.1007/b12005. ISBN 978-3-540-40797-3.
Youngdai Ko, Changhoon Lee, Seokhie Hong, and Sangjin Lee (2004). "Related Key Differential Cryptanalysis of Full-Round SPECTR-H64 and CIKS-1". Information Security and Privacy. Springer. pp. 137–148. doi:10.1007/b98755. ISBN 978-3-540-22379-5.

Block ciphers (security summary)

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

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

Other algorithms	3-Way Akelarre Anubis ARIA 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 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 Q RC6 REDOC Red Pike S-1 SAFER SAVILLE SC2000 SHACAL SHARK Simon SMS4 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 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

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

Spectr-H64

Cryptanalysis

References

Further reading