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Encyclopedia > MISTY1
MISTY1
Designer(s): Mitsubishi
First published: 1995
Successor(s): MISTY2, KASUMI
Key size(s): 128 bits
Block size(s): 64 bits
Structure: Feistel network
Rounds: n (8 recommended)

In cryptography, MISTY1 (or MISTY-1) is a block cipher designed in 1995 by Mitsuru Matsui and others for Mitsubishi Electric. MISTY1 is one of the selected algorithms in the European NESSIE project, and has been recommended for Japanese government use by the CRYPTREC project. KASUMI is a strengthened version of the MISTY1 cipher and has been adopted as the standard encryption algorithm for European mobile phones. KASUMI is highly vulnerable to a cipher-text only attacks that allow GSM mobile phone conversations to be decrypted either in real-time, or at any later time. Mitsubishi Logo The Mitsubishi Group ), Mitsubishi Group of Companies, or Mitsubishi Companies, all refer to a large grouping of independently operated Japanese companies which share the Mitsubishi brand name. ... In cryptography, KASUMI, also termed A5/3, is a block cipher used in the confidentiality (f8) and integrity algorithms (f9) for 3GPP mobile communications. ... In cryptography, the key size (alternatively key length) is a measure of the number of possible keys which can be used in a cipher. ... In modern cryptography, symmetric key ciphers are generally divided into stream ciphers and block ciphers. ... In cryptography, a Feistel cipher is a block cipher with a particular structure, named after IBM cryptographer Horst Feistel; it is also commonly known as a Feistel network. ... The German Lorenz cipher machine, used in World War II for encryption of very high-level general staff messages Cryptography (or cryptology; derived from Greek κρυπτός kryptós hidden, and γράφειν gráfein to write) is the study of message secrecy. ... Encryption Decryption In cryptography, a block cipher is a symmetric key cipher which operates on fixed-length groups of bits, termed blocks, with an unvarying transformation. ... 1995 (MCMXCV) was a common year starting on Sunday of the Gregorian calendar. ... Mitsuru Matsui is a Japanese cryptographer and senior researcher for Mitsubishi Electric Company. ... Mitsubishi Logo The Mitsubishi Group ), Mitsubishi Group of Companies, or Mitsubishi Companies, all refer to a large grouping of independently operated Japanese companies which share the Mitsubishi brand name. ... This article is about the continent. ... NESSIE (New European Schemes for Signatures, Integrity and Encryption) was a European research project funded from 2000–2003 to identify secure cryptographic primitives. ... CRYPTREC is the Cryptography Research and Evaluation Committee set up by the Japanese Government to evaluate and recommend cryptographic techniques for government and industrial use. ... In cryptography, KASUMI, also termed A5/3, is a block cipher used in the confidentiality (f8) and integrity algorithms (f9) for 3GPP mobile communications. ...


"MISTY" can stand for "Mitsubishi Improved Security Technology", it is also the initials of the researchers involved in its development: Matsui Mitsuru, Ichikawa Tetsuya, Sorimachi Toru, Tokita Toshio, and Yamagishi Atsuhiro [1].


MISTY1 is covered by patents, although the algorithm is freely available for academic (non-profit) use. RFC2994.

Contents

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Security

MISTY1 is a Feistel network with a variable number of rounds (any multiple of 4), though 8 are recommended. The cipher operates on 64-bit blocks and has a key size of 128 bits. MISTY1 has an innovative recursive structure. MISTY1 claims to be provably secure against linear and differential cryptanalysis. In cryptography, a Feistel cipher is a block cipher with a particular structure, named after IBM cryptographer Horst Feistel; it is also commonly known as a Feistel network. ... In cryptography, the key size (alternatively key length) is a measure of the number of possible keys which can be used in a cipher. ... In cryptography, linear cryptanalysis is a general form of cryptanalysis based on finding affine approximations to the action of a cipher. ... Differential cryptanalysis is a general form of cryptanalysis applicable primarily to block ciphers, but also to stream ciphers and cryptographic hash functions. ...


In the paper, "Block Ciphers and Stream Ciphers" by Alex Biryukov, it is noted that KASUMI, also termed A5/3, is a strengthened version of block cipher MISTY1 running in a Counter mode. In cryptography, KASUMI, also termed A5/3, is a block cipher used in the confidentiality (f8) and integrity algorithms (f9) for 3GPP mobile communications. ... In cryptography, KASUMI, also termed A5/3, is a block cipher used in the confidentiality (f8) and integrity algorithms (f9) for 3GPP mobile communications. ...

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See also

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In cryptography, KASUMI, also termed A5/3, is a block cipher used in the confidentiality (f8) and integrity algorithms (f9) for 3GPP mobile communications. ...

References

  • M. Matsui. Block encryption algorithm MISTY. In Fast Software Encryption, 4th International Workshop, FSE '97, LNCS 1267, pages 64–74. Springer, 1997.
  • Mitsuru Matsui. "Block encryption algorithm MISTY." Technical report of IEICE ISEC96-11 (1996-07). (In Japanese).
  • Alex Biryukov. "Block Ciphers and Stream Ciphers: The State of the Art", 2004, (PDF)
  • Elad Barkan, Eli Biham and Nathan Keller, Instant Ciphertext-Only Cryptanalysis of GSM Encrypted Communication, CRYPTO 2003, pp600–616 (PDF).
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External links

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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
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  Results from FactBites:
 
NationMaster - Encyclopedia: MISTY1 (3175 words)
MISTY1 is one of the selected algorithms in the European NESSIE project, and has been recommended for Japanese government use by the CRYPTREC project.
MISTY1 is a Feistel network with a variable number of rounds (any multiple of 4), though 8 are recommended.
Misty1 is a 64-bit symmetric block cipher with a 128-bit key.
News Releases - MITSUBISHI ELECTRIC (512 words)
As a result of these technical evaluations, the NESSIE board reached the conclusion that both the MISTY1 and Camellia are excellent ciphers in terms of security and practicality.
MISTY1 was the only primitive selected in the 64-bit block cipher category and Camellia was selected in the 128-bit block cipher category as well as AES, which is a current U.S. governmental standard.
MISTY1 and MISTY2 are both a 64-bit block cipher with a 128-bit key, which can be used for data communication and electronic commerce in open networks.
  More results at FactBites »

 
 

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