Modifying the structure KASUMI to improve its resistance towards attacks by inserting FSM and S-Box

FPGA implementation of an optimized A5/3 encryption algorithm

“…The future works will mainly focus on the robustness enhancement of the KASUMI encryption algorithm, which is still largely used in countries using UMTS mobile networks. To achieve this objective, we consider this proposed optimized-architecture which can be combined with previous works [6][7][8] to increase data protection against the usual cryptanalysis attacks.…”

“…They where cryptanalyzed a few years later [1][2][3][4] and replaced by the A5/3 algorithm which was also cryptanalyzed [5]. However, considering that the A5/3 algorithm is until widely used in Universal Mobile Telecommunication Systems (UMTS) networks (to perform the f8 confidentiality and f9 integrity functions), investigations are still proposed to improve the security optimization of the KASUMI algorithm [6][7][8]. Therefore, A5/3 optimization is yet very relevant.…”

FPGA implementation of an enhanced chaotic-KASUMI block cipher

“…However, in the last decade KASAUMI security was the object of many cryptanalyzed attacks as mentioned in [3][4][5][6][7][8][9]. But, investigations are still proposed to improve the security and resistance of the KASUMI algorithm [10][11][12]. For this reason, we decided to try proposing a solution aiming to recover this problem.…”

Improved Algoritms in Parallel Evaluation of Large Cryptographic S-Box

“…While these challenges act as practical threats to small S-Boxes, they are not virtually effective against large ones. Therefore, the use of large S-Boxes in block ciphers applied in conventional communication protocols (such as Kasumi in GSM) has recently drew attention of scholars [7]. It has also been shown that the large size of these S-Boxes can improve some of their encryption features, such as increasing their algebraic degree, increasing their resistance to differential and linear attacks [8], improving avalanche and strict avalanche feature [9], and providing bit independence [10].…”