Akelarre (cipher)

Akelarre (cipher)

Infobox block cipher
name = Akelarre
designers = G. Álvarez, D. de la Guía, F. Montoya, A. Peinado
publish date = 1996
derived from = IDEA, RC5
derived to =
related to =
key size = 128 bits
block size = 128 bits
structure = Substitution-permutation network
rounds = 4
cryptanalysis = Susceptible to ciphertext-only attack

Akelarre is a block cipher proposed in 1996, combining the basic design of IDEA with ideas from RC5. It was shown to be susceptible to a ciphertext-only attack in 1997.

Akelarre is a 128-bit block cipher with a variable key-length which must be some multiple of 64 bits. The number of rounds is variable, but four are suggested. The round function of Akelarre is similar to IDEA in structure.

After the successful cryptanalysis of Akelarre, its designers responded with an updated variant called Ake98. This cipher differs from the original Akelarre in the new "AR-box" (Addition-Rotation box), the swapping of words at the end of a round, and the addition of subkeys at the beginning of each round. In 2004, Jorge Nakahara, Jr. and Daniel Santana de Freitas found large classes of weak keys for Ake98. These weak keys allow a cryptanalysis faster than exhaustive search using only 71 known plaintexts, for up to 11.5 rounds of Ake98.

References

* cite conference
author = G. Álvarez Marañón, A. Fúster Sabater, D. Guía Martínez, F. Montoya Vitini, A. Peinado Domínguez
title = Akelarre: a New Block Cipher Algorithm
booktitle = Proceedings of SAC'96, Third Annual Workshop on Selected Areas in Cryptography
pages = pp.1–14
year = 1996
location = Queen's University, Kingston, Ontario
url = http://citeseer.ist.psu.edu/283649.html
format = PDF/PostScript
* cite conference
author = Niels Ferguson and Bruce Schneier
title = Cryptanalysis of Akelarre
booktitle = Proceedings of SAC'97, Fourth Annual Workshop on Selected Areas in Cryptography
pages = pp.201–212
month = August | year = 1997
location = Carleton University
url = http://www.schneier.com/paper-akelarre.pdf
format = PDF
* cite conference
author = Lars Knudsen and Vincent Rijmen
title = Two Rights Sometimes Make a Wrong
booktitle = Proceedings of SAC'97, Fourth Annual Workshop on Selected Areas in Cryptography
pages = pp.213–223
month = August | year = 1997
location = Carleton University
url = http://citeseer.ist.psu.edu/knudsen97two.html
format = PDF/PostScript
* cite journal
author = Lars Knudsen and Vincent Rijmen
title = Ciphertext-only Attack on Akelarre
journal = Cryptologia
volume = 24
issue = 2
pages = pp.135–147
month = April | year = 2000
doi = 10.1080/01611190008984238
* cite conference
author = J. Nakahara Jr., and D.S. de Freitas
title = Cryptanalysis of Ake98
booktitle = INDOCRYPT 2004, 5th International Conference on Cryptology in India
pages = pp.162–174
publisher = Springer-Verlag
year = 2004
location = Chennai
url = http://www.unisantos.br/mestrado/informatica/jorge/File/ake98.pdf.gz
format = gzipped PDF
accessdate = 2007-02-05


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