SECURE COMMUNICATION SYSTEMS BASED UPON TWO-FOLD MASKING OF DIFFERENT CHAOTIC ATTRACTORS, INCLUDING MODIFIED CHAOTIC ATTRACTORS, USING STATIC-DYNAMIC SECRET KEYS

摘要

A secure communication system includes a transmitter having a first and a second drive system corresponding to a five-term and a Lorenz-like chaotic attractor, respectively. A two- fold masking unit combines a corresponding first and second chaotic masking signal with a message signal, and transmits a two-fold chaotically masked message signal over a public channel. A dynamic secret key based upon the time series of the first chaotic masking signal is transmitted over a secret channel. A receiver includes a first response system and a second response system as synchronizable counterparts to the first and the second drive systems. The receiver is communicatively coupled to the public and secret channels, and generates and subtracts a version of the dynamic secret key from the received two-fold chaotically masked message signal. The receiver further generates a version of the second chaotic masking signal, and performs a subtraction operation to recover a message signal. A set of static secret keys at the transmitter and the receiver include a set of specified parameters and initial conditions of each of the chaotic attractors.