Digital logic is the system of binary signals, gates, and operations used to build electronic hardware. It turns inputs into outputs using rules such as AND, OR, NOT, and more complex circuits. In practice, digital logic is the foundation of CPUs, memory, network devices, embedded controllers, and FPGAs.
In cyber security, digital logic matters because it defines what hardware can do and how reliably it does it. Attackers may abuse logic flaws, timing behavior, or unintended states in custom chips and programmable devices. Defenders rely on digital logic when designing secure boot paths, tamper-resistant components, and hardware filters that enforce trust before software runs. On FPGA platforms, logic is described in configuration files, so protecting build artifacts and review processes is as important as securing source code.