A novel modified KASUMI block chiper for global system for mobile communications

KASUMI and SNOW-3G are encryption algorithms that are used to provide security in GSM, 3G mobile networks. Many security attacks like rectangle-attack, sandwich-attack, single-key attack, etc. breach the security of the traditional KASUMI block chiper. In order to enhance the security in the traditional KASUMI block chiper, we have proposed the modifications in traditional KASUMI by introducing Rijndaels’s S-box which is present in the SNOW-3G block chiper. Also, we propose to remove the FI function completely from the traditional KASUMI block chiper and suggest the modification in the FO function. In the proposed KASUMI block cipher, two FO functions are introduced that are FO(a) and FO(b). In FO(a), a 16-bit S-box is added, where in FO(b), cyclic shift operation is added. The simulation results show the performance improvement of the proposed work over conventional work in terms of total encryption time and speed. © 2019 Informa UK Limited, trading as Taylor & Francis Group.