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This article is about the block cipher. For other uses, see Nimbus (disambiguation). It has been suggested that this article or section be merged into NESSIE. (Discuss) Nimbus General Designers Alexis Machado First published 2000 Cipher detail Key sizes 128 bits Block sizes 64 bits Rounds 5 Best public cryptanalysis Differential cryptanalysis can break Nimbus with 256 chosen plaintexts. In cryptography, Nimbus is a block cipher invented by Alexis Machado in 2000. It was submitted to the NESSIE project, but was not selected. The algorithm uses a 128-bit key. It operates on blocks of 64 bits and consists of 5 rounds of encryption. The round function is exceedingly simple. In each round the block is XORed with a subkey, the order of its bits is reversed, and then it is multiplied mod 264 by another subkey, which is forced to be odd. Nimbus was broken by Vladimir Furman; he found a differential attack using only 256 chosen plaintexts. References Security evaluation of NESSIE first phase (PDF) Eli Biham, Vladimir Furman (November 29, 2000) (PDF/PostScript). Differential Cryptanalysis of Nimbus. http://citeseer.ist.psu.edu/biham00differential.html. Retrieved February 8, 2007.  This cryptography-related article is a stub. You can help Wikipedia by expanding it. v • d • e v • d • e   Block ciphers (security summary) Common algorithms AES · Blowfish · DES · Triple DES · Serpent · Twofish Less common algorithms CAST-128 · IDEA · RC2 · RC5 · SEED · Skipjack · TEA · XTEA Other algorithms 3-Way · ABC · Akelarre · Anubis · ARIA · BaseKing · BassOmatic · BATON · BEAR and LION · Camellia · CAST-256 · 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 · LOKI97 · LOKI89/91 · Lucifer · M6 · M8 · MacGuffin · Madryga · MAGENTA · MARS · Mercy · MESH · MISTY1 · MMB · MULTI2 · MultiSwap · New Data Seal · NewDES · Nimbus · NOEKEON · NUSH · Q · RC6 · REDOC · Red Pike · S-1 · SAFER · SAVILLE · SC2000 · SHACAL · SHARK · SMS4 · Spectr-H64 · Square · SXAL/MBAL · Threefish · Treyfer · UES · Xenon · xmx · XXTEA · Zodiac Design Feistel network · Key schedule · Product cipher · S-box · P-box · SPN Attack (Cryptanalysis) Brute force · Linear · Differential (Impossible · Truncated) · Integral · Boomerang · Mod n · Related-key · Slide · Rotational · Timing · XSL Standardization AES process · CRYPTREC · NESSIE Misc Avalanche effect · Block size · Initialization vector · Key size · Modes of operation · Piling-up lemma · Weak key · EFF DES cracker · Key whitening v • d • e   Cryptography History of cryptography · Cryptanalysis · Cryptography portal · Outline of cryptography Symmetric-key algorithm · Block cipher · Stream cipher · Public-key cryptography · Cryptographic hash function · Message authentication code · Random numbers · Steganography