CIKS-1

CIKS-1
General
Designers	A.A. Moldovyan and N.A. Moldovyan
First published	January 2002
Derived from	Spectr-H64
Cipher detail
Key sizes	256 bits
Block sizes	64 bits
Structure	Feistel-like network
Rounds	8
Best public cryptanalysis
Differential attack using 2⁵⁶ chosen plaintexts

In cryptography, CIKS-1 is a block cipher designed in 2002 by A.A. Moldovyan and N.A. Moldovyan. Like its predecessor, Spectr-H64, it relies heavily on permutations of bits, so is better suited to implementation in hardware than in software.

The algorithm has a block size of 64 bits. It uses an 8 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. In each round the key also undergoes a transformation dependent on the data. CIKS-1 uses four types of operations: data-dependent permutations, fixed permutations, XORs, and addition mod 4.

The designers of CIKS-1 didn't specify any key schedule for the cipher, but it uses a total key size of 256 bits. Kidney, Heys, and Norvell showed that round keys of low Hamming weight are relatively weak, so keys should be chosen carefully. The same researchers have also proposed a differential cryptanalysis of CIKS-1 which uses 2⁵⁶ chosen plaintexts.

References

B. Kidney, H. Heys, T. Norvell (November 12, 2003). "A Weight Based Attack on the CIKS-1 Block Cipher" (PDF/PostScript). Retrieved January 3, 2007.
B. Kidney; H. Heys; T. Norvell (2004). "A Differential Attack on the CIKS-1 Block Cipher" (PDF/PostScript). Retrieved January 3, 2007.

Changhoon Lee; Deukjo Hong; Sungjae Lee; Sangjin Lee; Hyungjin Yang; Jongin Lim (2002). "A Chosen Plaintext Linear Attack on Block Cipher CIKS-1". In Robert Deng; Sihan Qing; Feng Bao; Jianying Zhou. Information and Communications Security: 4th International Conference, ICICS 2002, Singapore, December 9–12, 2002 : Proceedings. Springer. pp. 456–468. ISBN 9783540001645.

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

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CIKS-1

References

Further reading