Electronic device for encryption and decryption of data blocks of message, has control stage controlling processing stage and calculating message authentication code block wise over encrypted and /or decrypted message

摘要

The device has a data processing channel (CH1) comprising a processing stage i.e. processing unit, for performing encryption and/ or decryption of data blocks. A control stage (FSM) is arranged such that it controls the processing stage so that data encryption and /or decryption are applied to data block in accordance with data encryption standard. The control stage controls another processing stage and calculates a message authentication code block wise over the encrypted and /or decrypted message received from the former processing stage. Independent claims are also included for the following: (1) a method for encryption of a message (2) a method for decryption of message.