A system for establishing a secure communication or authentication in real-time, the system consists of a first computing device and a second computing device, each with a content encoding and decoding module. Each content encoding and decoding module includes a content selection module that allows a user to choose content and send it to a pulse injector, which embeds pulse codes using contextual, user-specific from devices or a cloud/external database. The pulse oracle authenticates and adjusts pulse codes continuously for security. The pulse reader receives content, and sends decoded pulse information to second computing device, establishing secure communication in real time over network.