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arXiv 2021年

作者： Wang, Heng Li, Yang Pi, Yaodi Pan, Yan Shao, Yun Ma, Li Yang, Jie Zhang, Yichen Huang, Wei Xu, Bingjie Science and Technology on Communication Security Laboratory Institute of Southwestern Communication Chengdu610041 China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China

Continuous-variable quantum key distribution (CVQKD) has potential advantages of high secret key rate, which is very suitable for high-speed metropolitan network application. However, the reported highest secret key rates of the CVQKD systems up to now are limited in a few Mbps. Here, we address the fundamental experimental problems and demonstrate a single-carrier four-state CVQKD with sub-Gbps key rate within metropolitan area. In the demonstrated four-state CVQKD using local local oscillator, an ultra-low level of excess noise is obtained and a high efficient post-processing setup is designed for practically extracting the final secure keys. Thus, the achieved secure key rates are 190.54 Mbps and 137.76 Mbps and 52.48 Mbps using linear channel assuming security analysis method and 233.87 Mbps, 133.6 Mbps and 21.53 Mbps using semidefinite programming security analysis method over transmission distances of 5 km, 10 km and 25 km, respectively. This record-breaking result increases the previous secret key rate record by an order of magnitude, which is sufficient to achieve the one-time pad cryptographic task. Our work shows the road for future high-rate and large-scale CVQKD deployment in secure broadband metropolitan and access networks. © 2021, CC BY.

关键词： Quantum cryptography

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Sub-Gbps key rate four-state continuous-variable quantum key distribution within metropolitan area

Research Square

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Research Square 2021年

关键词： Quantum theory

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Practical Continuous-variable Quantum Key Distribution with Feasible Optimization Parameters

arXiv

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arXiv 2021年

作者： Ma, Li Yang, Jie Zhang, Tao Shao, Yun Liu, Jinlu Luo, Yujie Wang, Heng Huang, Wei Fan, Fan Zhou, Chuang Zhang, Liangliang Zhang, Shuai Zhang, Yichen Li, Yang Xu, Bingjie Science and Technology on Communication Security Laboratory Institute of Southwestern Communication Chengdu610041 China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China

Continuous-variable quantum key distribution (CV-QKD) offers an approach to achieve a potential high secret key rate (SKR) in metropolitan areas. There are several challenges in developing a practical CV-QKD system from the laboratory to the real world. One of the most significant points is that it is really hard to adapt different practical optical fiber conditions for CV-QKD systems with unified hardware. Thus, how to improve the performance of practical CV-QKD systems in the field without modification of the hardware is very important. Here, a systematic optimization method, combining the modulation variance and error correction matrix optimization, is proposed to improve the performance of a practical CV-QKD system with a restricted capacity of postprocessing. The effect of restricted postprocessing capacity on the SKR is modeled as a nonlinear programming problem with modulation variance as an optimization parameter, and the selection of an optimal error correction matrix is studied under the same scheme. The results show that the SKR of a CV-QKD system can be improved by 24% and 200% compared with previous frequently used optimization methods theoretically with a transmission distance of 50 km. Furthermore, the experimental results verify the feasibility and robustness of the proposed method, where the achieved optimal SKR achieved practically deviates Copyright © 2021, The Authors. All rights reserved.

关键词： Quantum cryptography

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An alternative approach for computing discrete logarithms in compressed SIDH

arXiv

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arXiv 2021年

作者： Lin, Kaizhan Wang, Weize Wang, Lin Zhao, Chang-An School of Mathematics Sun Yat-Sen University Guangzhou510275 China Science and Technology on Communication Security Laboratory Sichuan Chengdu610041 China Guangdong Key Laboratory of Information Security Guangzhou510006 China

Currently, public-key compression of supersingular isogeny Diffie-Hellman (SIDH) and its variant, supersingular isogeny key encapsulation (SIKE) involve pairing computation and discrete logarithm computation. In this paper, we propose novel methods to compute only 3 discrete logarithms instead of 4, in exchange for computing a lookup table efficiently. The algorithms also allow us to make a trade-off between memory and efficiency. Our implementation shows that the efficiency of our algorithms is close to that of the previous work, and our algorithms perform better in some special cases. © 2021, CC BY-NC-SA.

关键词： Table lookup

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Quantum proof and high-speed privacy amplification for quantum key distribution

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Physical Review Applied 2025年第5期23卷 054004-054004页

作者： Bing-Qi Yan Jun-Bin Wu Fan Fan Bing-Jie Xu Xiao-Ling Zhang Min Gu Key Laboratory of Atomic and Subatomic Structure and Quantum Control (Ministry of Education) Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter School of Physics South China Normal University Guangzhou 510006 China Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials Guangdong-Hong Kong Joint Laboratory of Quantum Matter South China Normal University Guangzhou 510006 China Quantum Science Center of Guangdong-HongKong-Macao Greater Bay Area (Guangdong) Shenzhen 518000 China School of Information and Communication Engineering University of Electronic Science and Technology of China Chengdu 611731 China National Key Laboratory of Security Communication Institute of Southwestern Communication Chengdu 610041 China

Privacy amplification (PA) is a vital step in the postprocessing stage of quantum key distribution, which can extract a secure key from a source partially leaked to the environment. We propose a PA scheme that uses the square hash (SQH)–modular arithmetic hash (MH) function. In consideration of a potential quantum attacker, we use the trace distance as a metric to measure the closeness between two classical-quantum states. We transform a raw key state to a processed state using this scheme and derive the trace distance between the processed state and the ideal target state. It is proven that the trace distance can be reached as small as desired. Additionally, our approach accelerates the SQH-MH function through the number-theoretic transform, reducing the computational complexity to O(nlog n). On the basis of a CPU, a maximum throughput rate of 1.06 Gbit/s is achieved, and the results show that our algorithm demonstrates good stability of the throughput rate when handling tasks with different compression ratios.

关键词： Number theory

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An Invocation Chain Test and Evaluation Method Based on Knowledge Graph

An Invocation Chain Test and Evaluation Method Based on Know...

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2020 International Conference on Networking and Network Applications, NaNA 2020

作者： Zhao, Yue Yang, Yarang Tian, Bo Zhang, Tianle Science and Technology on Communication Security Laboratory Chengdu610041 China College of Physics and Electrical Engineering Kashi University Kashi844006 China Cyberspace Institute of Advanced Technology Guangzhou University Guangzhou510006 China

ISBN: (纸本)9781728189543

The paper, on basis of the software vulnerability description specification, works out the vulnerability knowledge base for vulnerability combination, completes the specification modeling of target environment information and vulnerability description, proposes the vulnerability instantiation attack mode, obtains the atomic attack set, improves the process of atomic attack node combination, and finally proposes the automatic construction algorithm of invocation chain to get the vulnerability combination information and invocation chain information of the target system. The experimental results show that the invocation chain test and evaluation method based on knowledge graph can evaluate the system risk quantitatively rather than qualitatively by calculating comprehensive probability on all test sequences. © 2020 IEEE.

关键词： Specifications

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The cryptographic properties of the autocorrelation functions for encryption algorithm

The cryptographic properties of the autocorrelation function...

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International Conference on Mechatronics and Intelligent Robotics, ICMIR 2018

作者： Zhou, Yu Zhang, Aili Cao, Yunfei Science and Technology on Communication Security Laboratory Chengdu610041 China Xinxiang453007 China

ISBN: (纸本)9783030002138

The security for this Wireless sensor is important, and it is estimated by encryption algorithm. The basic component (named Boolean function) with encryption algorithm is studied, and we obtain the sum of high-order autocorrelation function of Boolean functions in cryptographic algorithms. The definition of the k-th autocorrelation function is given, we give the connections between the sum of the r-th autocorrelation functions and the sum of the (r − 1)-th autocorrelation functions. We obtain the tightness of the upper or lower bounds on the sum of the r-th autocorrelation function. We give the connection from Walsh transform and the sum of the r-th autocorrelation function. © Springer Nature Switzerland AG 2019.

关键词： Autocorrelation

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Sending-or-not-sending twin-field quantum key distribution with multiphoton states

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Physical Review A 2021年第6期104卷 062441-062441页

作者： Jun Teng Zhen-Qiang Yin Guan-Jie Fan-Yuan Feng-Yu Lu Rong Wang Shuang Wang Wei Chen Wei Huang Bing-Jie Xu Guang-Can Guo Zheng-Fu Han CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei 230026 People's Republic of China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui 230026 People's Republic of China Science and Technology on Communication Security Laboratory Institute of Southwestern Communication Chengdu Sichuan 610041 China State Key Laboratory of Cryptography P.O. Box 5159 Beijing 100878 People's Republic of China

The twin-field quantum key distribution (TF-QKD) protocol has led to extensive investigation for its capacity of overcoming the rate-distance limit. One variant for TF-QKD named sending-or-not-sending (SNS) TF-QKD has also been proposed. The SNS-TF-QKD encodes the classical keys 0 and 1 in sending or not sending the phase-randomized coherent states, which helps it to tolerate large misalignment errors due to optical phase fluctuations. Nevertheless, the original SNS-TF-QKD scheme utilizes only single-photon interference in generating secret keys, which seems quite different from other TF-QKD protocols. In this paper, we prove that multiphoton interference in the SNS TF-QKD protocol can also contribute to key generation. Accordingly, an improved SNS-TF-QKD scheme with higher key rate is proposed, where events of not only single-photon but also two-photon emissions are considered as effective events.

关键词： Quantum cryptography

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Practical security analysis of a continuous-variable quantum random-number generator with a noisy local oscillator

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Physical Review A 2020年第1期102卷 012422-012422页

作者： Weinan Huang Yichen Zhang Ziyong Zheng Yang Li Bingjie Xu Song Yu State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing 100876 China Science and Technology on Security Communication Laboratory Institute of Southwestern Communication Chengdu 610041 China

A quantum random-number generator (QRNG) can theoretically generate unpredictable random numbers with perfect devices and is an ideal and secure source of random numbers for cryptography. However, the practical implementations always contain imperfections, which will greatly influence the randomness of the final output and even open loopholes to eavesdroppers. Recently, Thewes et al. experimentally demonstrated a continuous-variable eavesdropping attack, based on heterodyne detection, on a trusted continuous-variable QRNG in Phys. Rev. A 100, 052318 (2019), yet like in many other practical continuous-variable QRNG studies, they always supposed the local oscillator was stable and ignored its fluctuation, which might lead to security threats such as wavelength attack. In this work, based on the theory of the conditional min-entropy, imperfections of the practical security of continuous-variable QRNGs are systematically analyzed, especially the local oscillator fluctuation under imbalanced homodyne detection. Experiments of a practical QRNG based on vacuum fluctuation are demonstrated to show the influence of local oscillator fluctuation on the total measurement noise variances and the practical conditional min-entropy with beam splitters of different transmittances. Moreover, a local oscillator monitoring method is proposed for the practical continuous-variable QRNG, which can be used to calibrate the practical conditional min-entropy.

关键词： Quantum cryptography Quantum information processing Quantum information processing with continuous variables Quantum optics

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Randomness quantification for quantum random number generation based on detection of amplified spontaneous emission noise

arXiv

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arXiv 2020年

作者： Yang, Jie Fan, Fan Liu, Jinlu Su, Qi Li, Yang Huang, Wei Xu, Bingjie Science and Technology on Security Communication Laboratory Institute of Southwestern Communication Chengdu610041 China State Key Laboratory of Cryptology Beijing100878 China

The amplified spontaneous emission (ASE) noise has been extensively studied and employed to build quantum random number generators (QRNGs). While the previous relative works mainly focus on the realization and verification of the QRNG system, the comprehensive physical model and randomness quantification for the general detection of the ASE noise are still incomplete, which is essential for the quantitative security analysis. In this paper, a systematical physical model for the emission, detection and acquisition of the ASE noise with added electronic noise is developed and verified, based on which the numerical simulations are performed under various setups and the simulation results all significantly fit well with the corresponding experimental data. Then, a randomness quantification method and the corresponding experimentally verifiable approach are proposed and validated, which quantifies the randomness purely resulted from the quantum process and improves the security analysis for the QRNG based on the detection of the ASE noise. The physical model and the randomness quantification method proposed in this paper are of significant feasibility and applicable for the QRNG system with randomness originating from the detection of the photon number with arbitrary distributions. Copyright © 2020, The Authors. All rights reserved.

关键词： Random number generation

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