Yoyo cryptanalysis on Future
by Sandip Kumar Mondal; Mostafizar Rahman; Santanu Sarkar; Avishek Adhikari
International Journal of Applied Cryptography (IJACT), Vol. 4, No. 3/4, 2024

Abstract: In ASIACRYPT 2017, Rønjom et al. reported Yoyo tricks on generic rounds of SPNs. Then they applied it to AES and found the most effective way to distinguish AES in several rounds. In FSE 2018, Saha et al. distinguished AES in a known key setting up to 8 rounds. In AFRICACRYPT 2022, Gupta et al. published a block cipher Future, whose design is like AES with some tweaks. In this paper, we analysed Future by Yoyo trick in both secret key settings and known key settings. We show that in the secret key setting, one can distinguish Future upto five and six rounds with data complexity 2^9.83 and 2^58.83 respectively. We also demonstrate that with known key settings, one can distinguish Future with data complexity 2¹⁵ for both six and eight rounds. Our attack is based on an adaptively chosen plaintext/ciphertext attack.

Online publication date: Fri, 03-May-2024

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