A Novel Approach to Algebraic and Fast Correlation Attacks for Cryptanalysis of Certain Keystream Generators

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概要

• 論文の詳細を見る

• This paper proposes a novel approach for cryptanalysis of keystream generators based on the composition of a linear finite state machine (LFSM) and nonlinear mapping. The proposed approach includes a dedicated decimation of the sample for cryptanalysis. Oppositely to the previously reported methods, the proposed one also identifies and uses certain characteristics of the LFSM state-transition matrix in order to reduce the nonlinearity of the system of overdefined equations employed in an algebraic attack scenario or to reduce the noise introduced due to the linearization of the nonlinear function which corrupts the linear equations employed in a correlation attack scenario. The developed method is employed for efficient cryptanalysis of the nonlinear combination keystream generator recently reported at INDOCRYPT 2004.

• 社団法人電子情報通信学会の論文
• 2005-05-20

著者

• IMAI Hideki

  Chuo University

• Imai Hideki

  Faculty Of Science And Engineering Chuo University:research Center For Information Security (rcis) N

• Fossorier Marc

  Department Of Electrical Engineering University Of Hawaii

• IMAI Hideki

  Institute of Industrial Science, The University of Tokyo

• Mihaljevic Miodrag

  Mathematical Institute, Serbian Academy of Science and Arts

• Imai Hideki

  Institute Of Industrial Science The University Of Tokyo

• Mihaljevic Miodrag

  Mathematical Institute Of Serbian Academy Of Sciences And Arts:research Center For Information Secur

• Imai Hideki

  Institute Of Industrial Science Interfaculty Initiative For Information Studies University Of Tokyo

• Fossorier Marc

  Department of Electrical Engineering, University of Hawaii

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