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This paper describes related key attacks on five and six round KASUMI. The five round attack requires the encryption of approximately 219 chosen plaintext pairs X and X* under keys K and K* respectively where K and K* differ in only one bit, and requires a maximum of a little over 233 trials to recover the entire key. The six round attack requires a smaller number of chosen plaintext encryptions than the five round attack, and recovers the entire key in a maximum of 2112 trials.