Half adder is a combinational circuit that performs simple addition of two binary numbers. The input variables designate the augend and addend bits; the output variables produce the sum and carry. It ...

Figure -01 HALF ADDER. Half Subtractor. The half-subtractor is a combinational circuit which is used to perform subtraction of two bits. It has two inputs, X (minuend) and Y (subtrahend) and two ...

Logic encryption for combinational circuits are proposed in this paper. Logic encryption is achieved by using key gate transistors in the circuit schematic of subtractors and adders. In this work, two ...