Wireless Channel Distortion for Secure Key Generation

The patent merges multiple peer-to-peer communication operations into a single multi-user channel utilization. Instead of requiring separate key generation and identity verification steps between each user pair, the system combines these functions into one simultaneous communication round where all users transmit on the same channel and the receiver processes all signals together, achieving the same security goals with reduced energy consumption.

The communication channel is made multi-functional by enabling it to simultaneously perform key generation, identity verification, and data transmission. The receiver uses the same received signals for multiple purposes: extracting shared keys through post-processing functions, verifying user identities through authentication protocols, and transmitting data, thereby eliminating the need for separate dedicated channels for each function.

The system maintains continuous useful action by having all n users transmit their signals simultaneously on the same channel rather than taking turns. The receiver continuously processes the combined signal to extract individual data from each user through post-processing functions, ensuring that the communication resource is fully utilized throughout the transmission period without idle time between user turns.

The patent transitions from a time-dimensional approach (sequential user transmissions) to a signal-processing dimension approach. Instead of allocating separate time slots or frequency channels for each user, the system allows all users to occupy the same time-frequency resource and separates their individual data through mathematical post-processing functions that exploit the distinct channel characteristics and signal structures of each user.

The system implements self-service by enabling users to generate their own shared keys locally through post-processing functions applied to the received channel signals, without requiring a trusted third party to facilitate key exchange. Each user independently computes the shared key using their private information and the received signals, making the key generation process autonomous and eliminating the need for external trusted entities.

The patent applies preliminary action by pre-processing the transmitted signals with private information before transmission and performing post-processing operations immediately upon reception. This allows the shared key to be generated in a single communication round rather than requiring multiple iterative rounds of exchange and verification, as the necessary computations are prepared in advance and executed immediately when signals are received.