Abstract
Applying the quadrature amplitude modulation (QAM) format, quantum-noise randomized cipher (QNRC) systems hide the signal states in quantum phase noise and amplitude noise to prevent eavesdropping. In this paper, based on the traditional wire-tap channel model analysis method, the physical-layer security of QAM-QNRC system is investigated quantitatively under the metric of secrecy rate. The general expressions of secrecy rates of the data and key are derived separately. Furthermore, the maximum reachable secrecy rate of a QAM-QNRC system is put forward, under which the data and key are both safe in the view of mutual information evaluation. Finally, the variation trend of secrecy rate with various system parameters is discussed in detail. The simulation results show that we can obtain a higher secrecy rate by setting reasonable parameters, such as the level of ciphertext, mesoscopic signal power, and inner gain at the transmitter. Meanwhile, the security of the key is the main constraint of the maximum reachable secrecy rate.
Highlights
Applying the quadrature amplitude modulation (QAM) format, quantum-noise randomized cipher (QNRC) systems hide the signal states in quantum phase noise and amplitude noise to prevent eavesdropping
2.1 Encryption Method of QAM-QNRC by Y-00 Protocol Figure 1 is a schematic of a QAM-QNRC system based on the wire-tap channel (WTC) model
When the inner gain is large sufficiently; that is, G0 ≥ 29d B and Rsu0 will stabilize to a value that is related to PS0 and M, and no longer varies with G0 and r
Summary
Network services such as high-definition video, virtual reality, Big Data, and cloud computing have emerged in recent years. With increasingly more confidential information being carried on optical fiber networks, the security of optical fiber communication has become extremely important. Due to enhanced computational ability, especially the proposed quantum computer [1], the traditional anti-interception methods based on computational complexity, such as the Advanced Encryption Standard (AES), have lost their security foundation. Enhancing the security of physical layer in optical communication is becoming increasingly more important [2]. Quantum key distribution (QKD), which generates a secure key stream, together with the “one-time pad” (OTP) cryptosystem [3], has been regarded as an effective method with which to guarantee secure communication theoretically. The limited QKD rate (e.g., 2.38 Mbps) [4] cannot support the high-speed data stream of the OTP. Fiber-optic anti-interception communication must provide ideal security, and a high transmission rate
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
