Cobra ciphers

In cryptography, Cobra is the general name of a family of data-dependent permutation based block ciphers: Cobra-S128, Cobra-F64a, Cobra-F64b, Cobra-H64, and Cobra-H128. In each of these names, the number indicates the cipher's block size, and the capital letter indicates whether it is optimized for implementation in software, firmware, or hardware.

References

Nikolay A. Moldovyan, Peter A. Moldovyanu, Douglas H. Summerville (January 2007). "On Software Implementation of Fast DDP-based Ciphers" (PDF). International Journal of Network Security 4 (1): 81–89. Retrieved 2007-01-12.
C. Lee, J. Kim, S. Hong, J. Sung, and S. Lee (2005). "Related-key differential attacks on Cobra-S128, Cobra-F64a and Cobra-F64b" (PDF). Proceedings of Mycrypt '05, LNCS 3715. Retrieved 2007-01-12.
C. Lee, J. Kim, J. Sung, S. Hong, S. Lee, and D. Moon (2005). "Related-key differential attacks on Cobra-H64 and Cobra-H128" (PostScript). Proceedings of IMA Cryptography and Coding '05, LNCS 3796. Retrieved 2007-01-12.
Jiqiang Lu, Changhoon Lee and Jongsung Kim (2006). "Related-Key Attacks on the Full-Round Cobra-F64a and Cobra-F64b" (PDF). Proceedings of SCN '06 (The Fifth International Conference on Security and Cryptography for Networks), LNCS 4116. Retrieved 2007-01-12.

Block ciphers (security summary)

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

Less common algorithms	Camellia CAST-128 IDEA RC2 RC5 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 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 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

Portal

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Cobra ciphers

See also

References