International Journal of Electrical, Electronics and Computer Engineering (IJEECE)
In this paper, the authors consider the design of a keyless digital security system using a hardware programming tool. The system uses a 4 x 4 keypad that allows users to enter four keystrokes as security password. These keystrokes are converted to BCD codes by the keypad encoder. The designed system comprises of two basic components fused together as a block (the memory logic and the security logic). The memory logic is the storage medium for the 4-keystrokes while the security logic compares entry keystrokes to keystrokes that are stored in the memory logic.