Dual-Channel Void Encoding (DCVE) encodes a hidden secondary data stream in the timing gaps between digital signal transitions — without altering voltage levels. A standard receiver sees only the primary signal; a DCVE-aware receiver also extracts the secondary stream from pulse durations. One physical wire carries two independent channels simultaneously. Applications include quantum-resistant key distribution, semiconductor authentication, IoT device identity, and covert secure communications. PDM embodiment delivers 95% throughput gain on a 1 Gbps link.