Some progresses of chaotic cipher and its applications in multimedia secure communications

This paper reviews the past situation and existing problems in chaotic cipher theories and applications, and reports the recent progress of some issues on theoretical design and hardware implementation of ciphers based on high-dimensional chaos system, including basic theory, design methods, typical applications, and ideas coping with the problems. In the aspect of design of chaotic cipher and its security evaluation, the following progress is summarized: counteracting dynamics degradation of digital chaotic systems with anti-control methods; designing no-degeneration chaotic systems in digital domain; proposing a multi-round chaotic stream cipher with the high-dimensional digital chaotic systems and feedback mechanism of self-loop; evaluating security level of the proposed chaotic ciphers with various methods. In the aspect of application and hardware implementation of multimedia secure communication, the following developments are reported: optimizing a cross platform conducting real-time remote chaotic secure communication, targeting different application businesses of hand-held devices, such as smartphone, computer, ARM, FPGA; and establishing a demonstration platform on chaotic secure communications to verify the effectiveness.