In
cryptography
Cryptography, or cryptology (from "hidden, secret"; and ''graphein'', "to write", or ''-logy, -logia'', "study", respectively), is the practice and study of techniques for secure communication in the presence of Adversary (cryptography), ...
, the IDEA NXT algorithm (previously known as FOX) is a
block cipher
In cryptography, a block cipher is a deterministic algorithm that operates on fixed-length groups of bits, called ''blocks''. Block ciphers are the elementary building blocks of many cryptographic protocols. They are ubiquitous in the storage a ...
designed by Pascal Junod and
Serge Vaudenay
Serge Vaudenay (born 5 April 1968) is a French cryptographer and professor, director of the Communications Systems Section at the École Polytechnique Fédérale de Lausanne
Serge Vaudenay entered the École Normale Supérieure in Paris as a ''n ...
of
EPFL (
Lausanne
Lausanne ( , ; ; ) is the capital and largest List of towns in Switzerland, city of the Swiss French-speaking Cantons of Switzerland, canton of Vaud, in Switzerland. It is a hilly city situated on the shores of Lake Geneva, about halfway bet ...
,
Switzerland
Switzerland, officially the Swiss Confederation, is a landlocked country located in west-central Europe. It is bordered by Italy to the south, France to the west, Germany to the north, and Austria and Liechtenstein to the east. 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 to the
International Data Encryption Algorithm
In cryptography, the International Data Encryption Algorithm (IDEA), originally called Improved Proposed Encryption Standard (IPES), is a Symmetric-key algorithm, symmetric-key block cipher designed by James Massey of ETH Zurich and Xuejia Lai an ...
(IDEA) and also uses the
Lai–Massey scheme
The Lai–Massey scheme is a cryptographic structure used in the design of block ciphers, an alternative to the Feistel network for converting a non-invertible keyed round function to an invertible keyed cipher. It is used in IDEA and IDEA NXT. ...
.
MediaCrypt AG holds
patents
A patent is a type of intellectual property that gives its owner the legal right to exclude others from making, using, or selling an invention for a limited period of time in exchange for publishing an sufficiency of disclosure, enabling discl ...
on elements of IDEA and IDEA NXT. The cipher is specified in two configurations: NXT64 (with block of 64 bits, key of 128 bits, 16 rounds) and NXT128 (with block of 128 bits, key of 256 bits, 16 rounds).
References
External links
FOX Specifications Version 1.2*
ttp://www.mediacrypt.com/ Mediacrypt homepage— IDEA licensor
FOX: a new family of block ciphersFOX algorithm implementation - a hardware design approachBSD licensed C Software implementation of IDEA NXT* [http://appft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220050053233%22.PGNR.&OS=DN/20050053233&RS=DN/20050053233 U.S. Patent Application Pub. No. 2005/0053233]
Block ciphers
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