Idea NXT

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IDEA NXT (FOX)
General
Round function of
Designers	Pascal Junod, Serge Vaudenay
First published	2003
Derived from	IDEA
Cipher detail
Key sizes	0-256 bits
Block sizes	64 or 128 bits
Structure	Lai-Massey scheme
Rounds	16
Best public cryptanalysis
Integral attack on 7 round NXT-64 with time complexity of 2^237.4 and on 5 round NXT-128 with time complexity of 2^205.6 by Wu Wenling, Zhang Wentao, and Feng Dengguo.

In cryptography, the IDEA NXT algorithm (previously known as FOX) is a block cipher designed by Pascal Junod and Serge Vaudenay of EPFL (Lausanne, Switzerland). It was conceived between 2001 and 2003, the project was originally named FOX and was published in 2003. In May 2005 it was announced by MediaCrypt under the name IDEA NXT. IDEA NXT is the successor of the International Data Encryption Algorithm (IDEA) and it uses an extended Lai-Massey scheme known for its robustness to cryptanalysis. It was mandated by MediaCrypt, a Swiss company owner of the distribution rights on IDEA and the patents of IDEA NXT. The IDEA NXT cipher is a family of different sub-ciphers with various blocks and keys size : Standard NXT64 (block of 64 bits, key of 128 bits, 16 rounds) and Standard NXT128 (block of 128 bits, key of 256 bits, 16 rounds). Variations of the Standard versions can be built (key of 0-256 bits, round numbers from 2-255). Also individual tables (sbox, permutation matrix) can be loaded, replacing the Standard table.

Mediacrypt states that IDEA NXT has two U.S. patent applications pending. (See links below.). The applications appear directed to key generation for the cipher.

The fact that IDEA NXT is patented and requires a license may influence the extent of its adoption, particularly given that there are viable public domain alternatives, e.g., AES, Serpent and the Twofish algorithm, and have no restrictions on them whatsoever.

External links

v t e Block ciphers (security summary)

Common algorithms	AES Blowfish DES Triple DES Serpent Twofish

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

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Design	Feistel network Key schedule Lai-Massey scheme Product cipher S-box P-box SPN Avalanche effect Block size Key size Key whitening No weak keys

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Standardization	AES process CRYPTREC NESSIE

Utilization	Initialization vector Mode of operation Padding

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