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DesignersMichael Jacobson Jr., Klaus Huber
First published1998
Cipher detail
Key sizes128, 192 or 256 bits
Block sizes128 bits
StructureFeistel network
Rounds6 or 8

In cryptography, MAGENTA is a 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; cryptographic weaknesses were discovered and it was found to be one of the slower ciphers submitted.[1]

MAGENTA has a block size of 128 bits and key sizes 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.[2] These were written up and presented at the second AES conference (Biham et al., 1999).


  1. ^ "Index of /CryptoToolkit/aes/round1/testvals/". NIST. Archived from the original on 2007-05-17.
  2. ^ Dianelos Georgoudis (1998-08-21). "Live from the First AES Conference". Newsgroupsci.crypt. Usenet: 6rj4sf$f8p$ Retrieved 2016-11-30.

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