CRYPTOGRAPHIC DEVICE FOR IMPLEMENTING S-BOX

PURPOSE: A cryptographic device for implementing an s-box is provided to prevent the exposure of internal data by consuming the same level of current when performing an S-box operation. CONSTITUTION: First logic gate arrays(211-213) comprises first logic gates which receives 2-bit signal among each the N-bit signal. A second logic gate array(220) receives J-bit signal coping with I-bit signal outputted from the respective first logic gate arrays. A third logic gate array(230) receives K-bit signal among the respective 2 bit signal outputted from second logic gate. Signals outputted from the first to the third logic gate array has one active bit.