A NEW METHOD FOR ACCELERATING IMPOSSIBLE DIFFERENTIAL CRYPTANALYSIS AND ITS APPLICATION ON LBLOCK

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KHALESI AKRAM; BAHRAMGIRI HOSSEIN; MANSURI DAVOD

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Journal: THE ISC INTERNATIONAL JOURNAL OF INFORMATION SECURITY Year:2016 | Volume:8 | Issue:1 Page(s): 73-84

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Title

A NEW METHOD FOR ACCELERATING IMPOSSIBLE DIFFERENTIAL CRYPTANALYSIS AND ITS APPLICATION ON LBLOCK

Author(s)

KHALESI AKRAM | BAHRAMGIRI HOSSEIN | MANSURI DAVOD | Issue Writer Certificate

Keywords

DIFFERENTIAL CRYPTANALYSISQ2

IMPOSSIBLE DIFFERENTIAL CRYPTANALYSISQ2

LBLOCKQ2

Abstract

Impossible DIFFERENTIAL CRYPTANALYSIS, the extension of DIFFERENTIAL CRYPTANALYSIS, is one of the most efficient attacks against block ciphers. This cryptanalysis method has been applied to most of the block ciphers and has shown significant results. Using structures, key schedule considerations, early abort, and pre-computation are some common methods to reduce complexities of this attack. In this paper, we present a new method for decreasing the time complexity of impossible DIFFERENTIAL CRYPTANALYSIS through breaking down the target key space into subspaces, and extending the results on subspaces to the main target key space. The main advantage of this method is that there is no need to consider the effects of changes in the values of independent key bits on each other. Using the 14-round impossible differential characteristic observed by Boura et al. at ASIACRYPT 2014, we implement this method on 23-round LBLOCK and demonstrate that it can reduce the time complexity of the previous attacks to 271.8 23-round encryptions using 259 chosen plaintexts and 273 blocks of memory.

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APA: Copy

KHALESI, AKRAM, BAHRAMGIRI, HOSSEIN, & MANSURI, DAVOD. (2016). A NEW METHOD FOR ACCELERATING IMPOSSIBLE DIFFERENTIAL CRYPTANALYSIS AND ITS APPLICATION ON LBLOCK. THE ISC INTERNATIONAL JOURNAL OF INFORMATION SECURITY, 8(1 ), 73-84. SID. https://sid.ir/paper/241794/en

Vancouver: Copy

KHALESI AKRAM, BAHRAMGIRI HOSSEIN, MANSURI DAVOD. A NEW METHOD FOR ACCELERATING IMPOSSIBLE DIFFERENTIAL CRYPTANALYSIS AND ITS APPLICATION ON LBLOCK. THE ISC INTERNATIONAL JOURNAL OF INFORMATION SECURITY[Internet]. 2016;8(1 ):73-84. Available from: https://sid.ir/paper/241794/en

IEEE: Copy

AKRAM KHALESI, HOSSEIN BAHRAMGIRI, and DAVOD MANSURI, “A NEW METHOD FOR ACCELERATING IMPOSSIBLE DIFFERENTIAL CRYPTANALYSIS AND ITS APPLICATION ON LBLOCK,” THE ISC INTERNATIONAL JOURNAL OF INFORMATION SECURITY, vol. 8, no. 1 , pp. 73–84, 2016, [Online]. Available: https://sid.ir/paper/241794/en

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