Abstract: There is provided an atmospheric pressure air microplasma system designed for random bit generation including a plurality of plasma electrodes, a power supply module supplying a DC voltage for igniting an arc discharge between the plurality of plasma electrodes, wherein the ignited arc discharge results in establishing and sustaining an arc current channel between the plurality of plasma electrodes, a current probe for measuring and collecting electric current time series data from the arc current channel, and a data acquisition board connected to the current probe for saving the collected electric current time series data, wherein binary sequences are generated from the electric current time series data. Further, the generated binary sequences are proven to pass all 15 tests of NIST Statistical Test Suite and thereby prove to qualify as random sequences.

Abstract: There is provided a physical layer security (PLS) system for enhanced cryptographic security and diversity of transmitted data, the system comprising a transmitter for first, converting the data into a plurality of OFDM symbols; second, multiplexing the plurality of OFDM symbols into parallel M OFDM streams; and third, performing spatial interleaving (SI) on the parallel M OFDM streams using a secret key. The system further comprises a receiver for receiving and de-scrambling the transmitted plurality of data samples, wherein software-defined radio (SDR) units are used as the system transmitter and receiver.