Low power encryption apparatus and method

The present invention relates to a low power encryption apparatus and method. According to one embodiment of the present invention, the low power encryption apparatus includes a mask value generation part; a mask value applying part generating a first masking round function values; a round key applying part generating a second masking round function values; a mask calculation operating part; a shift calculation operating part; and a shift calculation compensating part. [Reference numerals] (110) Plaintext input part; (120) Mask value generation part; (130) Mask value applying part; (140) Round key applying part; (150) Mask calculation operating part; (160) Shift calculation operating part; (170) Shift calculation compensating part; (180) Plaintext output part