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Security evaluation on Simeck against zero-correlation linear cryptanalysis

Security evaluation on Simeck against zero-correlation linear cryptanalysis

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Since proposed by the National Security Agency in June 2013, two lightweight block ciphers-SIMON and SPECK have attracted the attention of cryptographers from all over the world. At CHES 2015, Simeck, a new block cipher inspired from both SIMON and SPECK is proposed, which is more compact and efficient. However, the security evaluation on Simeck against zero-correlation linear cryptanalysis seems missing from the specification. The main focus of this study is to fill this gap and evaluate the security level of Simeck against zero-correlation linear cryptanalysis. According to the authors' study, 11-, 13- and 15-round zero-correlation linear distinguishers on Simeck32/48/64 are proposed, respectively, then zero-correlation linear cryptanalysis on 21-, 24-, 28-round Simeck32/48/64 are first proposed. As far as they know, for Simeck32, their result is the best result up to date.

References

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      • 1. Beaulieu, R., Shors, D., Smith, J., et al: ‘The SIMON and SPECK families of lightweight block ciphers’. Proc. 52nd ACM/EDAC/IEEE Conf. Design Automation Conf. (DAC), San Francisco, CA, USA, July 2015, pp. 16.
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      • 2. Bogdanov, A., Rijmen, V.: ‘Linear hulls with correlation zero and linear cryptanalysis of block ciphers’, Des. Codes Cryptogr., 2014, 70, (3), pp. 369383.
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      • 5. Yang, G., Zhu, B., Suder, V., et al: ‘The Simeck family of lightweight block ciphers’. Proc. CHES, Saint-Malo, France, September 2015, pp. 307329.
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      • 6. Kölbl, S., Roy, A.: ‘A brief comparison of Simon and Simeck’. Proc. Lightweight Cryptography for Security and Privacy, Aksaray, Turkey, September 2016, pp. 6988.
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      • 7. Bagheri, N.: ‘Linear cryptanalysis of reduced-round SIMECK variants’. Proc. INDOCRYPT, Bangalore, India, December 2015, pp. 140152.
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http://iet.metastore.ingenta.com/content/journals/10.1049/iet-ifs.2016.0503
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