Weak-Key Classes of 7-Round MISTY 1 and 2 for Related-Key Amplified Boomerang Attacks
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概要
- 論文の詳細を見る
In 1997, M. Matsui proposed secret-key cryptosystems called MISTY 1 and MISTY 2, which are 8- and 12-round block ciphers with a 64-bit block, and a 128-bit key. They are designed based on the principle of provable security against differential and linear cryptanalysis. In this paper we present large collections of weak-key classes encompassing 273 and 270 weak keys for 7-round MISTY 1 and 2 for which they are vulnerable to a related-key amplified boomerang attack. Under our weak-key assumptions, the related-key amplified boomerang attack can be applied to 7-round MISTY 1 and 2 with 254, 256 chosen plaintexts and 255.3 7-round MISTY 1 encryptions, 265 7-round MISTY 2 encryptions, respectively.
- （社）電子情報通信学会の論文
- 2008-02-01
著者
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Lim J
Center For Information Security Technologies (cist) Korea University
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Lim Jongin
Center For Information And Security Technologies (cist) Korea University
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Hong Seokhie
Center For Information Security Technologies (cist) Korea University
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Lee Changhoon
Center For Information Security Technologies (cist) Korea University
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KIM Jongsung
Center for Information Security Technologies (CIST), Korea University
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LEE Eunjin
Center for Information Security Technologies (CIST), Korea University
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HONG Deukjo
Center for Information Security Technologies (CIST), Korea University
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SUNG Jaechul
University of Seoul
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Kim Jongsung
Center For Information Security Technologies (cist) Korea University
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Hong D
Center For Information Security Technologies (cist) Korea University
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Hong Deukjo
Center For Information Security Technologies (cist) Korea University
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Lee Eunjin
Center For Information Security Technologies (cist) Korea University
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