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Biclique cryptanalysis is a recent technique developed for key retrieval of block ciphers. In this paper, biclique attack is carried out on full-round, PRESENT-80 block cipher. Here, the biclique is constructed using independent related key differential cryptanalysis. Matching with precomputation is used for the analysis for other rounds. The computational complexity for the successful implementation of the proposed attack is found less than that of attacks published so far. The data complexity and time complexity of the proposed attack are calculated as 2 23 and 2 79.63 , respectively.

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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.

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