View source for MAGENTA

{{Short description|Block cipher}}
{{about|the block cipher||Magenta (disambiguation)}}
{{Infobox block cipher
| name          = MAGENTA
| designers     = Michael Jacobson Jr., Klaus Huber
| publish date  = 1998
| key size      = 128, 192 or 256 bits
| block size    = 128 bits
| structure     = [[Feistel network]]
| rounds        = 6 or 8
| cryptanalysis =
}}

In [[cryptography]], '''MAGENTA''' is a [[symmetric key algorithm|symmetric key]] [[block cipher]] developed by Michael Jacobson Jr. and Klaus Huber for [[Deutsche Telekom]]. The name MAGENTA is an [[acronym]] for '''Multifunctional Algorithm for General-purpose Encryption and Network Telecommunication Applications'''. (The color [[magenta]] is also part of the [[corporate identity]] of Deutsche Telekom.) The cipher was submitted to the [[Advanced Encryption Standard process]], but did not advance beyond the first round; [[cryptanalysis|cryptographic weaknesses]] were discovered and it was found to be one of the slower ciphers submitted.<ref>{{cite web
 |url=http://csrc.nist.gov/CryptoToolkit/aes/round1/testvals/
 |title=Index of /CryptoToolkit/aes/round1/testvals/
 |archive-url=https://web.archive.org/web/20070517135121/http://csrc.nist.gov/CryptoToolkit/aes/round1/testvals/
 |archive-date=2007-05-17
 |publisher=[[NIST]]
 |url-status=dead
}}</ref>

MAGENTA has a [[block size (cryptography)|block size]] of 128 [[bit]]s and [[key size]]s of 128, 192 and 256 bits. It is a [[Feistel cipher]] with six or eight rounds.

After the presentation of the cipher at the first AES conference, several cryptographers immediately found vulnerabilities.<ref>{{cite newsgroup
| title = Live from the First AES Conference
| author = Dianelos Georgoudis
| date = 1998-08-21
| newsgroup = sci.crypt
| message-id = 6rj4sf$f8p$1@nnrp1.dejanews.com
| url = https://groups.google.com/forum/#!msg/sci.crypt/yLh8TmH-4Bc/5VGTa1HK76QJ
| access-date = 2016-11-30}}</ref> These were written up and presented at the second AES conference (Biham et al., 1999).

==References==
{{Reflist}}
* {{Cite conference
| author1=Eli Biham
| author-link=Eli Biham
| author2=Alex Biryukov
| author2-link=Alex Biryukov
| author3=Niels Ferguson
| author3-link=Niels Ferguson
| author4=Lars Knudsen
| author4-link=Lars Knudsen
| author5=Bruce Schneier
| author5-link=Bruce Schneier
| author6=Adi Shamir
| author6-link=Adi Shamir
| title=Cryptanalysis of Magenta
| conference=Second AES candidate conference
| date=April 1999
| url=https://www.schneier.com/academic/paperfiles/paper-magenta.pdf
| publication-date=1998-08-20}}

== External links ==
* [http://www.quadibloc.com/crypto/co040411.htm John Savard's description of Magenta]
* [http://www.users.zetnet.co.uk/hopwood/crypto/scan/cs.html#MAGENTA SCAN's entry for the cipher]

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[[Category:Deutsche Telekom]]
[[Category:Feistel ciphers]]
[[Category:Broken block ciphers]]