Affiliations: [a] Department of Electronics and Communication, College of Engineering, Thalassery, Kerala, India
| [b] Division of Electronics, School of Engineering, Cochin University of Science and Technology, Kerala, India
Correspondence:
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Corresponding author. K.B. Jithendra, Department of Electronics and Communication, College of Engineering, Thalassery, Kerala, India. Tel.: +91 9447847432, E-mail: jithendrakb@gmail.com.
Abstract: Security of a recently proposed bitwise block cipher GIFT is evaluated in this paper. In order to mount full round attacks on the cipher, biclique cryptanalysis method is applied. Both variants of the block cipher are attacked using Independent biclique approach. For recovering the secret keys of GIFT-64, the proposed attack requires 2127.45 full GIFT-64 encryption and 28 chosen plain texts. For recovering the secret keys of GIFT-128, the proposed attack requires 2127.82 full GIFT-128 encryption and 218 chosen plain texts. The attack complexity is compared with that of other attacks proposed previously. The security level of GIFT is also compared with that of the parent block cipher PRESENT, based on the analysis.
