Abstract
The KASUMI block cipher imparts confidentiality and integrity to the 3G mobile communication systems. In this paper, we present power analysis attack on KASUMI as a two-pronged attack: first, the FL function is targeted, and subsequently the recovered output of FL function is used to mount attack on 7 × 7 and 9 × 9 S-boxes embedded in the FO function of the cipher. Our attack recovers all 128 bits of the secret key of KASUMI. Furthermore, we present a countermeasure for this attack which requires lesser resource footprint as compared with existing countermeasures, rendering such implementations practically feasible for resource-constrained applications, such as IoT and RFID devices. In addition, we propose linear equivalent mappings and Permutation-XOR equivalent mappings of 7 × 7 S-boxes which have stronger resilience against power analysis attacks with respect to the improved transparency order and confusion coefficient parameters while restoring the classical cryptographic properties. We point out some properties of linear equivalence (LE) classes of these S-boxes with respect to these metrics as well.
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