Session 5: Computer security Design and analysis of the key stream generator based on the KASUMI

This paper comprehensively uses the CTR, OFB modes of the KASUMI algorithm, in order to improve the security of the keystream generator as soon as possible. The keystream generator based on the hybrid modes of the KASUMI algorithm is shown in Figure 2, the IV is the initial vector of the 64 bits counter CTR and the 64 bits shift register SREG, and R is a 64 bits random number used for randomization of the CTR number, and K is 128 bits seed key.