Robust chaos keying secure communication system, communication method, terminal and storage medium

Abstract

The invention belongs to the technical field of chaos security, and discloses a robust chaos keying security communication system, a communication method, a terminal and a storage medium. At the sending end, a double delay feedback chaos keying system is designed, and a fixed delay feedback is used for To ensure the chaotic characteristics of the system, another channel of controllable delay feedback is used to carry 0 and 1 bit information, and the 0 or 1 state is used to control the closure and opening of the delay feedback; when the transmitter is in the open / close state of the delay keying modulation module, The chaotic signal output by the system and its delayed signal are used to train the neural network to establish two relationship models; at the receiving end, the two models are used to verify the mapping relationship between the modulated chaotic signal and the delayed signal segmentally. Decryption is performed under the premise of chaotic carrier at the terminal. The invention can effectively resist the return mapping attack on chaotic keying, and provides the possibility for safe transmission under severe communication conditions.

Description

technical field [0001] The invention belongs to the technical field of chaotic security, and in particular relates to a robust chaotic keying security communication system, a communication method, a terminal and a storage medium. Background technique [0002] Since the optical chaotic secure communication with a communication rate of 1Gb / s was realized in the 120km metropolitan area network of Athens in 2005, the research on optical chaotic secure communication has attracted worldwide attention and has made great progress. Its transmission rate, transmission distance , security have been significantly improved, and gradually become one of the most feasible physical layer encryption methods. A large number of experiments have realized and reported long-distance (greater than 100km) high-speed optical fiber chaotic secure communications. It is worth noting that in some practical communication environments, such as wireless communication, underwater communication, and free-spa...

AI Technical Summary

Problems solved by technology

However, the design of the adaptive controller at the receiving end is complex, and its practicability is limited

(3) Chaos keying has the attribute of spread spectrum, so it has better anti-noise performance, but it is vulnerable to the attack of return mapping analysis

[0005] (1) When the non-coherent chaotic security communication strategy is adopted, the receiver does not need to recover the chaotic carrier generated by the transmitter through high-quality chaotic synchronization, which has high anti-noise performance, but at the same time means that it does not need to consider Chaotic synchronization and parameter sensitivity, so the sensitivity of chaotic systems to initial values ​​and parameters is difficult to be directly and effectively applied to security enhancement

[0006] (2) Chaos concealment is easy to implement, but because the power change of the synthesized signal will lead to weak security, the power of the information signal must be much smaller than the power of the chaotic carrier, which makes it relatively sensitive to channel noise and has a high bit error rate

[0007] (3) When designing a chaotic parameter modulation communication system, it is necessary to design an adaptive controller with a certain mathematical form for a given chaotic system, which weakens its practicability to a certain extent

[0008] (4) Chaos keying essentially has the attribute of spread spectrum, so it naturally has better anti-noise performance, but it is vulnerable to the attack of return mapping analysis

[0009] (5) The basis for the realization of coherent chaotic secure communication decryption is chaotic synchronization. For this reason, both communication parties must use lasers with the same structural parameters to ensure high-quality synchronization, which brings obstacles to the practical application of laser chaotic secure communication.

Images