Cryptology ePrint Archive: Report 2016/628

On the properties of the CTR encryption mode of the Magma and Kuznyechik block ciphers with re-keying method based on CryptoPro Key Meshing

Liliya R. Ahmetzyanova and Evgeny K. Alekseev and Igor B. Oshkin and Stanislav V. Smyshlyaev and Lolita A. Sonina

Abstract: This paper presents a security bound in the standard security model for the Magma cipher CTR encryption mode and the «CryptoPro Key Meshing» (CPKM) re-keying method that was previously used with the GOST 28147-89 cipher. We enumerate the main requirements that should be followed during the development of re-keying methods, then we propose a modified method and justify its advantages over CPKM. We also obtain certain results about the operational features of the Kuznyechik cipher CTR encryption mode with several re-keying methods.

Category / Keywords: secret-key cryptography / key management, block ciphers, counter mode

Date: received 17 Jun 2016, last revised 27 Aug 2016

Contact author: smyshsv at gmail com

Available format(s): PDF | BibTeX Citation

Note: We've added the citation for the important previous work of Abdalla and Bellare, that had been forgotten in the original version of the preprint.

Version: 20160827:192734 (All versions of this report)

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