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Two-step transmission with artificial noise for secure wireless SIMO communications

Science China(information Sciences) 2015年第4期58卷 115-127页

作者： WANG Bo MU PengCheng YANG PeiZhi YIN QinYe Ministry of Education Key Lab for Intelligent Networks and Network Security School of Electronic and Information Engineering Xi’an Jiaotong University

The issue of physical layer security of the wireless single-input multiple-output(SIMO) system is addressed in this paper. We propose a two-step transmission scheme with artificial noise to improve the security and the scheme does not require the channel state information of the eavesdropper. In the first step, the destination which has multiple antennas generates a random reference symbol and artificial noise and transmits them in the direction of the source and its orthogonal space, respectively. The reference symbol is received by the source without being polluted by the artificial noise, while it is jammed by the artificial noise for the eavesdropper. In the second step, the symbol of the source is multiplied by the received reference symbol and then transmitted. Finally, the destination can directly estimate the symbol of the source using the reference symbol. However, the eavesdropper needs to additionally estimate the reference symbol for demodulating the symbol of the source, which usually obtains an inaccurate result due to the artificial noise. The informationtheoretic security of our scheme is analyzed and a lower bound of the achievable secrecy rate is derived. The performance of the new scheme is compared with that of the traditional approach under different input signals through numerical simulations. The results show that the proposed scheme outperforms the traditional SIMO approach especially in the high SNR region.

关键词： wireless communication physical layer security multi-antenna SIMO artificial noise

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A 3D Memristive Cubic Map with Dual Discrete Memristors: Design, Implementation, and Application in Image Encryption

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IEEE Transactions on Circuits and Systems for Video Technology 2025年

作者： Gao, Suo Iu, Herbert Ho-Ching Erkan, Ugur Simsek, Cemaleddin Toktas, Abdurrahim Cao, Yinghong Wu, Rui Mou, Jun Li, Qi Wang, Chunpeng Dalian Polytechnic University School of Information Science and Engineering Dalian116034 China The University of Western Australia School of Electrical Electronic and Computer Engineering Perth6009 Australia Faculty of Engineering Electrical and Electronics Engineering Respectively Karamanoglu Mehmetbey University Karaman70200 Turkey Ankara University Engineering Faculty Department of Artificial Intelligence and Data Engineering Ankara06830 Turkey Harbin Institute of Technology School of Computer Science and Technology Harbin150001 China Key Laboratory of Computing Power Network and Information Security Ministry of Education Shandong Computer Science Center National Supercomputer Center in Jinan Shandong Provincial Key Laboratory of Computer Networks Shandong Fundamental Research Center for Computer Science Jinan250000 China

Discrete chaotic systems based on memristors exhibit excellent dynamical properties and are more straightforward to implement in hardware, making them highly suitable for generating cryptographic keystreams. However, most existing memristor-based chaotic systems rely on a single memristor. This paper introduces a novel discrete chaotic system employing dual memristors, named the 3D memristive cubic map with dual discrete memristors (3D-MCM). The 3D-MCM system demonstrates richer and more intricate dynamical behaviors compared to its single-memristor counterparts, as verified through bifurcation diagrams, Lyapunov exponent spectra, and complexity analyses. Notably, the system exhibits coexisting attractors, substantially enhancing its dynamical complexity. Hardware implementation of the 3D-MCM attractors confirms its feasibility for industrial applications. To illustrate the system's potential in encryption tasks, this study integrates the quaternary-based permutation and dynamic emanating diffusion (QPDED-IE) scheme for image encryption with the *** results demonstrate that the QPDED-IE scheme based on the 3D-MCM exhibits strong diffusion and confusion properties, effectively resisting cryptanalytic attacks. © 1991-2012 IEEE.

关键词： Bifurcation (mathematics)

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Secure mediated certificateless signature scheme

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The Journal of China Universities of Posts and Telecommunications 2007年第2期14卷 75-78页

作者： YANG Chen MA Wen-ping WANG Xin-mei Ministry of Education Key Laboratory of Computer Networks and Information Security Xidian University Xi'an 710071 China

Ju et al. proposed a certificateless signature scheme with instantaneous revocation by introducing security mediator （SEM） mechanism. This article presents a detailed cryptoanalysis of this scheme and shows that, in their proposed scheme, once a valid signature has been produced, the signer can recover his private key information and the instantaneous revocation property will be damaged. Furthermore, an improved mediated signature scheme, which can eliminate these disadvantages, is proposed, and security proof of the improved scheme under elliptic curve factorization problem （ECFP） assumption and bilinear computational diffie-hellman problem （BCDH） assumption is also proposed.

关键词： certificateless signature scheme bilinear pairing security mediator

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电子学报(英文版) 2008年第4期17卷 710-714页

作者： CHEN Jie ZHANG Yueyu HU Yupu Key Laboratory of Computer Networks and Information Security Ministry of Education Xidian University Xi＇an 710071 China

This paper presents a method for related-key rectangle attack on 7-round AES-128, Advanced Encryption Standard with a 128-bit secret key, using 256 related keys. This attack on the reduced to 7-round AES-128 requires about 2115 chosen plaintexts, performs 2¹¹⁵ 7-round AES-128 encryptions. Furthermore, the probability is about 0.958 to succeed in recovering the secret key. Finally, we summarize the results of our attack together with previous works.

关键词：加密术块密码密钥攻击编密码标准

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On the Joint Nonlinear Span of Multiple Binary Sequence

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电子学报(英文版) 2007年第2期16卷 321-325页

作者： DONG Lihua HU Yupu The Key Laboratory of Computer Networks and Information Security the Ministry of Education Xidian University Xi＇an 710071 China

Recent developments in stream ciphers show strong interests in word-based (or vectorized) stream ciphers. The theory of such stream ciphers required the study of the complexity of multisequences. In this paper the problem proposed by Rizomiliotis of determining the joint nonlinear span of the prescribed multiple sequences is considered for the first time. An efficient algorithm is proposed, by using the special block structure of the associated system of linear equations. Both the total processing time and the memory requirements are linear in the sequence length.

关键词：非线性区间二进制多序列密码学流密码

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Attribute-based access control mechanism for perceptive layer of the internet of things

International Journal of Digital Content Technology and its ...

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International Journal of Digital Content Technology and its Applications 2011年第10期5卷 396-403页

作者： Fang, Ren Jian-Feng, Ma Ministry of Education Key Laboratory of Computer Networks and Information Security Xidian University Xi'an China

The complex architecture of the internet of things has more requirements for security and the access control of it need flexible fine-grained access and support for anonymous access for users. The internet of things can be logically divided into three layers: perceptive layer, transport layer and process layer. The function of perceptive layer of which the wireless sensor networks are important parts is to perceive the information outside and submit it to transport layer. At present, only coarse-grained access control models such as identity-based and role-based are proposed and they have not meet the security requirements of the internet of things. In this paper, we propose a fine-grained access control model based on user's attributes and realize it by using bilinear map. This scheme effectively realizes the fine-graind access control and the anonymity of users' access in perceptive layer of the internet of things and minimizes the number of information exchange between user and sensor nodes, and the computation of sensor nodes is reduced to one public key operation. Analysis shows that the proposed scheme has several advantages over the current access control methods by better scalab.lity and lower cost in communication and computation.

关键词： Internet of things

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Short-ciphertext and BDH-based CCA2 secure certificateless encryption

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Science China(information Sciences) 2010年第10期53卷 2005-2015页

作者： SUN YinXia & LI Hui 1 key lab.of computer networks and information security, ministry of education, Xidian University, Xi’an 710071, China 1. Key Lab of Computer Networks and Information Security Ministry of Education Xidian University Xi’an 710071 China

Certificateless public key cryptosystem actually belongs to identity based cryptography, with an attractive characteristic that the private key generator does not have access to any user’s full private key. Most of the existing certificateless encryption schemes employ the FO-technique and/or strong assumptions, for example GBDH, Gap-BDH and BDHI, to achieve adaptive chosen ciphertext security (CCA2 security). However, FO-technique introduces redundancy in ciphertext, and strong assumption reduces our confidence in the security of the underlying scheme. In this paper, we present a short-ciphertext CCA2 secure certificateless encryption scheme under the standard BDH assumption. Due to short ciphertext and convincing security, our scheme has practical value.

关键词： identity based cryptography certificateless encryption bilinear pairing BDH problem twin BDH problem random oracle

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Density-aware and Depth-aware Visual Representation for Zero-Shot Object Counting

Density-aware and Depth-aware Visual Representation for Zero...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Fang Nan Feng Tian Ni Zhang Nian Liu Haonan Miao Guang Dai Mengmeng Wang Faculty of Electronic and Information Engineering Xi’an Jiaotong University Xi’an China Ministry of Education Key Laboratory of Intelligent Networks and Network Security Xi’an Jiaotong University Xi’an China School of Automation Northwestern Polytechnical University Xi’an China Computer Vision Department Mohamed bin Zayed University of Artificial Intelligence Abu Dhabi UAE SGIT AI Lab State Grid Corporation of China Zhejiang University of Technology Hang Zhou China

ISBN: (数字)9798350368741

ISBN: (纸本)9798350368758

Previous methods often utilize CLIP semantic classifiers with class names for zero-shot object counting. However, they ignore crucial density and depth knowledge for counting tasks. Thus, we propose a density-aware and depth-aware prompt counting model, which captures density information via learning density-aware prompts based on density-aware contrastive loss and incorporates depth guidance with predefined depth-aware prompts. To facilitate the training process, we design two strategies for standard counting loss and the contrastive loss, where the former prioritizes larger and sparser objects initially, gradually focusing on smaller and denser objects, and the latter adopts coarse-to-fine density learning. Besides, we construct a dataset named LVIS-372 with more real-world scenarios and balanced instance distribution compared to existing ones. Finally, the experimental results demonstrate the effectiveness of our proposed method.

关键词： Training Visualization Semantics Focusing Signal processing Acoustics Power capacitors Speech processing Standards

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Impossible differential cryptanalysis of advanced encryption standard

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Science in China(Series F) 2007年第3期50卷 342-350页

作者： CHEN Jie HU YuPu ZHANG YueYu Key Laboratory of Computer Networks & Information Security Ministry of Education Xidian UniversityXi'an 710071 China

Impossible differential cryptanalysis is a method recovering secret key, which gets rid of the keys that satisfy impossible differential relations. This paper concentrates on the impossible differential cryptanalysis of Advanced Encryption Standard （AES） and presents two methods for impossible differential cryptanalysis of 7-round AES-192 and 8-round AES-256 combined with time-memory trade-off by exploiting weaknesses in their key schedule. This attack on the reduced to 7-round AES-192 requires about 294.5 chosen plaintexts, demands 2129 words of memory, and performs 2157 7-round AES-192 encryptions. Furthermore, this attack on the reduced to 8-round AES-256 requires about 2^101 chosen plaintexts, demands 2^201 words of memory, and performs 2^228 8-round AES-256 encryptions.

关键词： block cipher impossible differential cryptanalysis advanced encryption standard cryptanalysis

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引用

Science in China(Series F) 2009年第4期52卷 617-626页

作者： WEI YongZhuang HU YuPu Key Laboratory of Computer Networks & Information Security of Ministry of Education Xidian University Xi'an 710071 China

In this paper, we examine the security of reduced AES-192 and AES-256 against related-key rectangle attacks by exploiting the weakness in the AES key schedule. We find the following two new attacks： 9-round reduced AES-192 with 4 related keys, and 10-round reduced AES-256 with 4 related keys. Our results show that related-key rectangle attack with 4 related keys on 9-round reduced AES-192 requires a data complexity of about 2^101 chosen plaintexts and a time complexity of about 2^174.8 encryptions, and moreover, related-key rectangle attack with 4 related keys on 10-round reduced AES-256 requires a data complexity of about 2^97.5 chosen plaintexts and a time complexity of about 2^254 encryptions. These attacks are the first known attacks on 9-round reduced AES-192 and 10-round reduced AES-256 with only 4 related keys. Furthermore, we give an improvement of the 10-round reduced AES-192 attack presented at FSE2007, which reduces both the data complexity and the time complexity.

关键词： block cipher Advanced Encryption Standard related-key rectangle attack time complexity

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