Secondary chaotic encryption optical communication system based on phase transformation

Abstract

The invention discloses a secondary chaotic encryption optical communication system based on phase transformation. The system comprises an optical signal transmitting device, a chaotic combined phase transformation encryption device, a transmission fiber, a chaotic combined phase transformation decryption device and a signal receiving device. The signal encryption part is a chaotic encryption module added with a phase transformation decryption device in a feedback loop, and the signal decryption device is an open-loop chaotic laser receiving module comprising a phase transformation decryption device. The system overcomes the defect that encryption variables of a chaotic encryption system are few; by combining phase transformation decryption with chaotic encryption, an eavesdropper is difficult in analyzing and attacking the energy; high-speed signals can be supported, and 10 Gb / s high-speed signals can be directly encrypted; a light emitting source of an existing WDM (Wavelength Division Multiplexing) system can be directly used for encrypting, and a special ultra-short pulse light source is not needed; and decryption can be implemented by using the same phase transformation modules at the receiving end as at the transmitting end, so that the adjusting difficulty is reduced without changing the confidentiality.

Description

technical field [0001] The invention relates to the field of secure optical communication, in particular to a secondary encryption chaotic secure optical communication system based on phase transformation. Background technique [0002] In an era of ever-increasing communication data, people have increasingly high requirements for the confidentiality of communication content. In order to ensure that users can safely transmit confidential information on a reliable open channel without being obtained by illegal users, the signal must be encrypted. The corresponding secure communication technology research is constantly deepening, and the current signal encryption methods can be divided into software encryption and physical layer encryption. [0003] Software encryption: The security of software encryption is based on computational complexity, that is, eavesdroppers need to calculate within a limited time to crack the entire cryptographic system. However, with the rapid develop...

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Problems solved by technology

However, the quantum encryption method also has many shortcomings: First, the current quantum encryption technology is still in the research stage, and the effective distance of its quantum key distribution on the optical fiber is not up to the requirements of long-distance optical fiber communication.

However, the security of chaotic secure communication relies on the fact that an eavesdropper cannot obtain the hardware device, and its user-adjustable parameters are relatively small, which causes a disadvantage of chaotic communication: the security of communication is basically determined by the optical hardware manufacturer. control, not by the user

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