Methods for finding differential characteristics of block cipher «Cypress»

Authors

  • M.Yu. Rodinko
  • R.V. Oliynykov

DOI:

https://doi.org/10.30837/rt.2017.4.191.05

Abstract

Three methods for finding differential characteristics of the round function of the block cipher «Cypress» are proposed, namely: a direct search method, a two-way search method, and an optimized method for finding the differential characteristic with high probability. The purpose of all three approaches is to activate the smallest amount of bits at inputs of the modulo addition transformation of the round function, which, in turn, increases the likelihood of the transformation. The optimized method makes it possible to find the differential characteristic on the round function of the block cipher "Cypress" with a probability that equals ¼.

References

Mouha, Nicky. The Design Space of Lightweight Cryptography [Text] / Nicky Mouha // NIST Lightweight Cryptography Workshop 2015. – 2015. – 19 p.

Beaulieu R. et al. The SIMON and SPECK lightweight block ciphers // Design Automation Conference (DAC), 2015 52nd ACM/EDAC/IEEE // IEEE, 2015. – С. 1-6.

Bern-stein D. J. The Salsa20 family of stream ciphers Salsa. – 2007.

Bernstein D. J. ChaCha, a Variant of Salsa // Workshop Record of SASC: The State of the Art of Stream Ciphers.

Родінко М.Ю., Олійников Р.В. Постквантовий малоресурсний симетричний блоковий шифр «Кипарис» // Радіотехніка. – 2017. – Вип. 189. – С. 100-107.

Biham, E. Differential Cryptanalysis of DES-like Cryptosystem / E. Biham, A. Shamir // Journal of Cryptology. – 1991. – Vol. 4. – P. 3-72.

Biryukov A., Velichkov V. Automatic Search for Differential Trails in ARX Ciphers //CT-RSA. – 2014. – Т. 8366. – С. 227-250.

Mouha N. et al. The Differential Analysis of S-Functions // Selected Areas in Cryptography. – 2010. – V. 6544. – P. 36-56.

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Published

2017-12-22

How to Cite

Rodinko, M., & Oliynykov, R. (2017). Methods for finding differential characteristics of block cipher «Cypress». Radiotekhnika, 4(191), 47–51. https://doi.org/10.30837/rt.2017.4.191.05

Issue

No. 191 (2017): Radiotekhnika

Section

Articles

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