System and method for generating analog-digital mixed chaotic signal, encryption communication method thereof

A method for generating an analog-digital mixed chaotic signal, comprising:

• generating a digital chaotic sequence from a digital chaotic system;
• generating continuous chaotic signals from a continuous chaotic system;
• generating a synchronizing impulse signal for controlling the continuous chaotic system according to states of the digital chaotic system and the continuous chaotic system, and outputting the synchronizing impulse signal to the continuous chaotic system;
• and
• disturbing the digital chaotic system according to the state of the continuous chaotic system.

An encryption communication system, comprising a transmitting party, and a receiving party configured to communicate with the transmitting party, wherein a first analog-digital mixed chaotic system included in the transmitting party is configured to encrypt a plaintext to bc transmitted by using a chaotic signal generated by itself, and outputting a resultant cipher text;

• and a second analog-digital mixed chaotic system included in the receiving party is configured to decrypt a received cipher text by using a chaotic signal generated by itself, and outputting a resultant plaintext;
• and
• wherein, initial conditions and system parameters of the digital chaotic systems in the first and the second analog-digital mixed chaotic systems are substantially the same, and
• each of the first and the second analog-digital mixed chaotic systems respectively comprises:
• a digital chaotic system adapted to generate a digital chaotic sequence;
• a continuous chaotic system adapted to generate a continuous chaotic signal;
• a synchronization coupling module adapted to generate a synchronizing impulse signal for controlling the continuous chaotic system according to states of the digital chaotic system and the continuous chaotic system, and output the synchronizing impulse signal to the continuous chaotic system;
• a disturbance coupling module adapted to disturb the digital chaotic system according to the state of the continuous chaotic system;
• and
• a controlling module adapted to control operating states of the digital chaotic system and the continuous chaotic system, and operating states of the synchronization coupling module and the disturbance coupling module.