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Quantum Neural Network based Distinguisher for Differential Cryptanalysis on Simplified Block Ciphers
Authors: Hyunji Kim, Kyungbae Jang, Sejin Lim, Yeajun Kang, Wonwoong Kim, Hwajeong SeoAbstract:
Differential cryptanalysis is a block cipher analysis technology that infers a key by using the difference characteristics. Input differences can be distinguished using a good difference characteristic, and this distinguishing task can lead to key recovery. Artificial neural networks are a good solution for distinguishing tasks. For this reason, recently, neural distinguishers have been actively studied. We propose a distinguisher based on a quantum-classical hybrid neural network by utilizing the
recently developed quantum neural network. To our knowledge, we are the
first attempt to apply quantum neural networks for neural distinguisher. The target ciphers are simplified ciphers (S-DES, S-AES, S-PRESENT-), and a quantum neural distinguisher that classifies the input difference from random data was constructed using the Pennylane library. Finally, we obtained quantum advantages in this work: improved accuracy and reduced number of parameters. Therefore, our work can be used as a quantum neural distinguisher with high reliability for simplified ciphers.
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