M6 block cipher system and method for encoding content and authenticating a device

An M6 block cipher system that performs a plurality of round operations in order to authenticate a device for receiving/transmitting content and encoding content, in which each of the plurality of round operations includes a plurality of sub round operations, the system comprising:

• a rotate constant selector device selecting one or more rotate constants from a plurality of input rotate constants for output based on a selection signal input thereto,
• a rotate constant ordering device ordering, for output, each of the selected rotate constants, a separately received common rotate constant and a separately received non-common rotate constant, in response to the rotate constant selection signal,
• an M6 core device generating one or more of an output signal, a validity signal, a round number and a sub round number based on the ordered rotate constants and a plurality of input signals, and
• a rotate constant scheduler device outputting the ordering signal to the rotate constant ordering device in response to the selection signal, the round number and the sub round number.