• KSII Transactions on Internet and Information Systems
    Monthly Online Journal (eISSN: 1976-7277)

Improved Meet-in-the-Middle Attacks on Crypton and mCrypton


Abstract

Crypton is a SP-network block cipher that attracts much attention because of its excellent performance on hardware. Based on Crypton, mCrypton is designed as a lightweight block cipher suitable for Internet of Things (IoT) and Radio Frequency Identification (RFID). The security of Crypton and mCrypton under meet-in-the-middle attack is analyzed in this paper. By analyzing the differential properties of cell permutation, several differential characteristics are introduced to construct generalized δ-sets. With the usage of a generalized δ-set and differential enumeration technique, a 6-round meet-in-the-middle distinguisher is proposed to give the first meet-in-the-middle attack on 9-round Crypton-192 and some improvements on the cryptanalysis of 10-round Crypton-256 are given. Combined with the properties of nibble permutation and substitution, an improved meet-in-the-middle attack on 8-round mCrypton is proposed and the first complete attack on 9-round mCrypton-96 is proposed.


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Cite this article

[IEEE Style]
Jingyi Cui, Jiansheng Guo, Yanyan Huang and Yipeng Liu, "Improved Meet-in-the-Middle Attacks on Crypton and mCrypton," KSII Transactions on Internet and Information Systems, vol. 11, no. 5, pp. 2660-2679, 2017. DOI: 10.3837/tiis.2017.05.020

[ACM Style]
Cui, J., Guo, J., Huang, Y., and Liu, Y. 2017. Improved Meet-in-the-Middle Attacks on Crypton and mCrypton. KSII Transactions on Internet and Information Systems, 11, 5, (2017), 2660-2679. DOI: 10.3837/tiis.2017.05.020