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MISTY redirects here. For other meanings, see Misty

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In cryptography, MISTY1 (or MISTY-1) is a block cipher designed in 1995 by Mitsuru Matsui and others for Mitsubishi Electric.[1][2]

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 successor of the MISTY1 cipher which was supposed to be stronger than MISTY1 and has been adopted as the standard encryption algorithm for European mobile phones. In 2005, KASUMI was broken, and in 2010 a new paper was published detailing a practical attack on the cipher; see the article for more details.

"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.[3]

MISTY1 is covered by patents, although the algorithm is freely available for academic (non-profit) use in RFC 2994.


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; the round function itself uses a 3-round Feistel network. MISTY1 claims to be provably secure against linear and differential cryptanalysis.

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.[4]

However, in 2010 Dunkelman, Keller, and Shamir showed that KASUMI not as strong as MISTY1 [5] but interestingly the KASUMI attack will not work against MISTY1.

See also[]


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  • Elad Barkan, Eli Biham and Nathan Keller, Instant Ciphertext-Only Cryptanalysis of GSM Encrypted Communication, CRYPTO 2003, pp. 600–616 (PDF).

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