ENCRYPTION DEVICE USING KASUMI ENCRYPTION ALGORITHM

摘要

PURPOSE: An encryption device using a Kasumi encryption algorithm is provided to reduce the power consumption by forming around circuit with an FO block and an F1 block. CONSTITUTION: A register portion(100) stores selectively one of plaintext data and input data. A secret key scheduler(150) generates a secret key to encrypt the plaintext data. An FL block(160) is used for calculating output data of the register portion and the secret key by using an FL function of a Kasumi encryption algorithm. An FO block(170) the output data of the register portion and the secret key by using an F1 function of the Kasumi encryption algorithm. An adder portion(180A) performs an exclusive logical OR operation for each output data of the FO block and the F1 block and the output data of the register portion. An input/output control portion(200A) selects the input data of the FO block and the F1 block and a path of the output data.