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Information about Idea Nxt

IDEA NXT (FOX)
Round function of
General
Pascal Junod, Serge Vaudenay
2003
IDEA
Cipher detail
Key size(s):| 0-256 bits
Block size(s):| 64 or 128 bits
Lai-Massey scheme
16
Best public cryptanalysis|-| colspan=2 | Integral attack on 7 round NXT-64 with time complexity of 2237.4 and on 5 round NXT-128 with time complexity of 2205.6 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 IDEA algorithm 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 alternatives (eg AES, Serpent and the Twofish algorithm) in the public domain which have no restrictions on them whatsoever.

External links

Block ciphers
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Standardization: AES process | CRYPTREC | NESSIE Misc: Avalanche effect | Block size | IV | Key size | Modes of operation | Piling-up lemma | Weak key
Cryptography
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History of cryptography | Cryptanalysis | | Topics in cryptography
Symmetric-key algorithm | Block cipher | Stream cipher | Public-key cryptography | Cryptographic hash function | Message authentication code | Random numbers
Serge Vaudenay (5 April 1968-) is a well-known French cryptographer.

Serge Vaudenay entered the École Normale Supérieure in Paris as a normalien student in 1989. In 1992, he passed the agrégation in mathematics.
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20th century - 21st century - 22nd century
1970s  1980s  1990s  - 2000s -  2010s  2020s  2030s
2000 2001 2002 - 2003 - 2004 2005 2006

2003 by topic:
News by month
Jan - Feb - Mar - Apr - May - Jun
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IDEA
An encryption round of IDEA

General
James Massey, Xuejia Lai
1991

PES
MMB, MESH, Akelarre,
IDEA NXT (FOX)

Cipher detail
Key size(s):| 128 bits

Block size(s):| 64 bits
Substitution-permutation network
8.
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In cryptography, the key size (alternatively key length) is the size of the digits used to create an encrypted text; it is therefore also a measure of the number of possible keys which can be used in a cipher, and the number of keys which must be tested to 'break' the
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block size. Both the input (plaintext) and output (ciphertext) are the same length; the output cannot be shorter than the input — this is logically required by the Pigeonhole principle and the fact that the cipher must be invertible — and it is simply undesirable for
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Cryptanalysis (from the Greek kryptós, "hidden", and analıein, "to loosen" or "to untie") is the study of methods for obtaining the meaning of encrypted information, without access to the secret information which is normally required to do so.
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In cryptography, integral cryptanalysis is a cryptanalytic attack that is particularly applicable to block ciphers based on substitution-permutation networks. It was originally designed by Lars Knudsen as a dedicated attack against Square, so is commonly known as the
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Cryptography (or cryptology; derived from Greek κρυπτός kryptós "hidden," and the verb γράφω gráfo "write" or λεγειν legein
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block cipher is a symmetric key cipher which operates on fixed-length groups of bits, termed blocks, with an unvarying transformation. When encrypting, a block cipher might take a (for example) 128-bit block of plaintext as input, and output a corresponding 128-bit block
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Serge Vaudenay (5 April 1968-) is a well-known French cryptographer.

Serge Vaudenay entered the École Normale Supérieure in Paris as a normalien student in 1989. In 1992, he passed the agrégation in mathematics.
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Lausanne (pronounced [loˈzan]) is a city in the French-speaking part of Switzerland, situated on the shores of Lake Geneva (French: Lac Léman
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Motto
Unus pro omnibus, omnes pro uno (Latin) (traditional)[1]
"One for all, all for one"
Anthem
"Swiss Psalm"
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IDEA
An encryption round of IDEA

General
James Massey, Xuejia Lai
1991

PES
MMB, MESH, Akelarre,
IDEA NXT (FOX)

Cipher detail
Key size(s):| 128 bits

Block size(s):| 64 bits
Substitution-permutation network
8.
..... Click the link for more information.
patent is a set of exclusive rights granted by a state to a patentee for a fixed period of time in exchange for a disclosure of an invention.

The procedure for granting patents, the requirements placed on the patentee and the extent of the exclusive rights vary widely
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AES
The SubBytes step, one of four stages in a round of AES

General
Vincent Rijmen, Joan Daemen
1998

Square
Anubis, Grand Cru

AES winner, CRYPTREC, NESSIE
Cipher detail
Key size(s):| 128, 192 or 256 bits[1]
..... Click the link for more information.
Twofish
The Twofish algorithm

General
Bruce Schneier
1998

Blowfish, SAFER, Square

AES finalist
Cipher detail
Key size(s):| 128, 192 or 256 bits

Block size(s):| 128 bits
Feistel network
16
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block cipher is a symmetric key cipher which operates on fixed-length groups of bits, termed blocks, with an unvarying transformation. When encrypting, a block cipher might take a (for example) 128-bit block of plaintext as input, and output a corresponding 128-bit block
..... Click the link for more information.
3-Way

General
Joan Daemen
1994

NOEKEON
BaseKing

Cipher detail
Key size(s):| 96 bits

Block size(s):| 96 bits
Substitution-permutation network
11
Best public cryptanalysis|-| colspan=2 | related-key attack

In cryptography,
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AES
The SubBytes step, one of four stages in a round of AES

General
Vincent Rijmen, Joan Daemen
1998

Square
Anubis, Grand Cru

AES winner, CRYPTREC, NESSIE
Cipher detail
Key size(s):| 128, 192 or 256 bits[1]
..... Click the link for more information.
Akelarre

General
G. Álvarez, D. de la Guía, F. Montoya, A. Peinado
1996

IDEA, RC5

Cipher detail
Key size(s):| 128 bits

Block size(s):| 128 bits
Substitution-permutation network
4
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Anubis

General
Vincent Rijmen and Paulo S. L. M. Barreto
2000

Rijndael

Cipher detail
Key size(s):| 128 to 320 bits in steps of 32 bits

Block size(s):| 128 bits
substitution-permutation network
..... Click the link for more information.
ARIA

General

2003

AES

South Korean standard
Cipher detail
Key size(s):| 128, 192, or 256 bits

Block size(s):| 128 bits
Substitution-permutation network
12, 14, or 16
..... Click the link for more information.
BaseKing

General
Joan Daemen
1994

NOEKEON
3-Way

Cipher detail
Key size(s):| 192 bits

Block size(s):| 192 bits
Substitution-permutation network
11
Best public cryptanalysis|-| colspan=2 | related-key attack, power analysis
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Blowfish
The round function (Feistel function) of Blowfish

General
Bruce Schneier
1993

Twofish

Cipher detail
Key size(s):| 32-448 bits in steps of 8 bits; default 128 bits

Block size(s):| 64 bits
Feistel network
16
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Cryptomeria cipher
The Feistel function of the Cryptomeria cipher algorithm.

General
4C Entity
2003

DES

CSS

Cipher detail
Key size(s):| 56 bits

Block size(s):| 64 bits
Feistel network
10

The
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Camellia

General
Mitsubishi, NTT
2000

E2, MISTY1

CRYPTREC, NESSIE
Cipher detail
Key size(s):| 128, 192 or 256 bits

Block size(s):| 128 bits
Feistel network
18 or 24

In cryptography, Camellia
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CAST-128
Three rounds of the CAST-128 block cipher

General
Carlisle Adams and Stafford Tavares
1996

CAST-256

Cipher detail
Key size(s):| 40 to 128 bits

Block size(s):| 64 bits
Feistel network
12 or 16
In cryptography,
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CAST-256

General
Carlisle Adams, Stafford Tavares, Howard Heys, Michael Wiener
1998

CAST-128

Cipher detail
Key size(s):| 128, 192 or 256 bits

Block size(s):| 128 bits
generalised Feistel network
48
In cryptography, CAST-256
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CIKS-1

General
A.A. Moldovyan and N.A. Moldovyan
January 2002

Spectr-H64

Cipher detail
Key size(s):| 256 bits

Block size(s):| 64 bits
Feistel-like network
8
Best public cryptanalysis|-| colspan=2 | Differential attack using 2
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CIPHERUNICORN-A

General
NEC
2000

CIPHERUNICORN-E

CRYPTREC
Cipher detail
Key size(s):| 128, 192, or 256 bits

Block size(s):| 128 bits
nested Feistel network
16
In cryptography, CIPHERUNICORN-A
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