A High-Speed ​​Physical Key Distribution System with Enhanced Security

Abstract

The invention belongs to the technical field of secure communication, and discloses a security-enhanced high-speed physical key distribution system, which includes a driving laser and a third beam splitter; the chaotic laser emitted by the driving laser is divided into two beams, and one beam is sent to the communicating party After passing through the first chirped fiber grating, it is divided into two beams, which are respectively injected into the first semiconductor laser and the second semiconductor laser to output chaotic signals, and the other beam is sent to the other party of communication and then divided into two beams after passing through the second chirped fiber grating. It is two beams, which are respectively injected into the third and fourth semiconductor lasers to make them output chaotic signals; the chaotic lasers emitted by the first, second, third and fourth semiconductor lasers pass through the first, second, third and fourth light beams respectively. After switching, it is detected by the first photodetector and the second photodetector; the first and second optical switches and the third and fourth optical switches are respectively controlled by complementary random numbers output by the first and second random number generators; The invention improves the security and speed of key distribution.

Description

technical field [0001] The invention belongs to the technical field of secure communication, and in particular relates to a high-speed physical key distribution system with enhanced security. Background technique [0002] Information security transmission is the key to network security and an important guarantee for national security and economic security in the information age. my country began to build a 100Gb / s backbone optical fiber communication network in 2014, and began to deploy a gigabit (Gbps) broadband access network in 2019, which urgently needs Gbps high-speed information security transmission. According to Shannon's "one-time-one-key" theory, secure and confidential communication requires both parties to have the same true random number as the key, the rate of which is not lower than the data rate, and cannot be reused. It can be seen that the fundamental of high-speed secure transmission lies in the Gbps key generation and distribution technology. At present...

AI Technical Summary

Problems solved by technology

However, the above scheme needs to exchange modulation parameters on a public channel, which increases the probability of key leakage and reduces the security of key distribution

In addition, due to the limitation of synchronization signal recovery time in the parameter modulation process, the key distribution rate of this scheme is difficult to continue to improve

[0014] In summary, the existing key distribution technology cannot take into account both speed and security. It is necessary to develop a Gbps physical key security distribution scheme to meet the needs of "one-time secret" high-speed secure communication in the era of big data.

Images