Spatiotemporal chaos-based secure image transmission scheme by using spread-spectrum over the internet

Based on one-way coupled map lattices model (OCML), binary spatiotemporal chaotic sequences are generated and employed in the application of image spread-spectrum communication over the Internet. Since the spatiotemporal chaotic sequences are very sensitive to the coupled coefficient, initial value of driven sequence and as well as control parameters, the difficulties of cracking chaotic spread-spectrum sequences are increased greatly. Furthermore, the system secure keys are encrypted by using RSA algorithm so as to guarantee the consistency of parameters that used by image sender and receiver, as a result the security and reliability of the scheme are enhanced. The results of numerical stimulation indicate the scheme proposed in this paper is feasible, and some cryptography properties of this system are considered in terms of key space and the sensitivity of encrypted image with respect to the key.