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http://dx.doi.org/10.13089/JKIISC.2007.17.1.121

Provable Security for New Block Cipher Structures against Differential Cryptanalysis and Linear Cryptanalysis  

Kim, Jong-Sung (Center for Information Security Technologies, Korea University)
Jeong, Ki-Tae (Center for Information Security Technologies, Korea University)
Lee, Sang-Jin (Center for Information Security Technologies, Korea University)
Hong, Seok-Hie (Center for Information Security Technologies, Korea University)
Abstract
Differential cryptanalysis and linear cryptanalysis are the most powerful approaches known for attacking many block ciphers and used to evaluating the security of many block ciphers. So designers have designed secure block ciphers against these cryptanalyses. In this paper, we present new three block cipher structures. And for given r, we prove that differential(linear) probabilities for r-round blockcipher structures are upper bounded by $p^2(q^2),\;2p^2(2q^2)$ if the maximum differential(linear) probability is p(q) and the round function is a bijective function.
Keywords
Block cipher; Differential Cryptanalysis; Linear Cryptanalysis; Feistel structure;
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