This paper presents a description and performance evaluation of a new bit-level, lossless, adaptive, and asymmetric data compression scheme that is based on the adaptive character wordlength (ACW(n)) algorithm. Th...This paper presents a description and performance evaluation of a new bit-level, lossless, adaptive, and asymmetric data compression scheme that is based on the adaptive character wordlength (ACW(n)) algorithm. The proposed scheme enhances the compression ratio of the ACW(n) algorithm by dividing the binary sequence into a number of subsequences (s), each of them satisfying the condition that the number of decimal values (d) of the n-bit length characters is equal to or less than 256. Therefore, the new scheme is referred to as ACW(n, s), where n is the adaptive character wordlength and s is the number of subsequences. The new scheme was used to compress a number of text files from standard corpora. The obtained results demonstrate that the ACW(n, s) scheme achieves higher compression ratio than many widely used compression algorithms and it achieves a competitive performance compared to state-of-the-art compression tools.展开更多
In this paper,a novel bit-level image encryption method based on dynamic grouping is proposed.In the proposed method,the plain-image is divided into several groups randomly,then permutation-diffusion process on bit le...In this paper,a novel bit-level image encryption method based on dynamic grouping is proposed.In the proposed method,the plain-image is divided into several groups randomly,then permutation-diffusion process on bit level is carried out.The keystream generated by logistic map is related to the plain-image,which confuses the relationship between the plain-image and the cipher-image.The computer simulation results of statistical analysis,information entropy analysis and sensitivity analysis show that the proposed encryption method is secure and reliable enough to be used for communication application.展开更多
Military image encryption plays a vital role in ensuring the secure transmission of sensitive visual information from unauthorized access.This paper proposes a new Tri-independent keying method for encrypting military...Military image encryption plays a vital role in ensuring the secure transmission of sensitive visual information from unauthorized access.This paper proposes a new Tri-independent keying method for encrypting military images.The proposed encryption method is based on multilevel security stages of pixel-level scrambling,bitlevel manipulation,and block-level shuffling operations.For having a vast key space,the input password is hashed by the Secure Hash Algorithm 256-bit(SHA-256)for generating independently deterministic keys used in the multilevel stages.A piecewise pixel-level scrambling function is introduced to perform a dual flipping process controlled with an adaptive key for obscuring the spatial relationships between the adjacent pixels.Adynamicmasking scheme is presented for conducting a bit-level manipulation based on distinct keys that change over image regions,providing completely different encryption results on identical regions.To handle the global correlation between large-scale patterns,a chaotic index-map system is employed for shuffling image regions randomly across the image domain based on a logistic map seeded with a private key.Experimental results on a dataset of military images show the effectiveness of the proposed encryption method in producing excellent quantitative and qualitative results.The proposed method obtains uniform histogram distributions,high entropy values around the ideal(≈8 bits),Number of Pixel Change Rate(NPCR)values above 99.5%,and low Peak Signal-to-Noise Ratio(PSNR)over all encrypted images.This validates the robustness of the proposed method against cryptanalytic attacks,verifying its ability to serve as a practical basis for secure image transmission in defense systems.展开更多
针对传统检测方法在复杂干扰条件下鲁棒性不足的问题,提出一种基于混合专家(Mixture-of-Experts,MoE)网络的抗干扰检测方法,用于复杂电磁环境下正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)信号的可靠检测。依托复...针对传统检测方法在复杂干扰条件下鲁棒性不足的问题,提出一种基于混合专家(Mixture-of-Experts,MoE)网络的抗干扰检测方法,用于复杂电磁环境下正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)信号的可靠检测。依托复杂干扰条件下的OFDM信号模型,采用融合导频信息的多通道接收特征作为模型输入;设计干扰识别驱动的级联接收结构,通过干扰识别网络判别干扰类型,并根据识别结果自适应选择MoE网络中的对应专家模型,实现针对性干扰抑制;结合DeepRx检测网络实现比特级检测。仿真结果表明,在多类典型干扰场景下,所提方法相比直接检测、混合干扰训练模型以及线性最小均方误差(Linear Minimum Mean Square Error,LMMSE)检测器,能够获得更低的误码率(Bit Error Rate,BER),并表现出更稳定的检测性能,从而有效提升复杂电磁环境下OFDM系统的抗干扰检测能力。展开更多
The image's least significant bit(LSB) covers lots of the details that have been commonly used in image encryption analysis. The newly proposed fractal sorting vector(FSV) and FSV-based LSB chaotic permutation(FSV...The image's least significant bit(LSB) covers lots of the details that have been commonly used in image encryption analysis. The newly proposed fractal sorting vector(FSV) and FSV-based LSB chaotic permutation(FSV-LSBCP) is a novel chaotic image encryption cryptosystem introduced in this article. The FSV-LSBCP effectively strengthens the security of the cryptographic scheme concerning the properties of the FSV. Key analysis, statistical analysis, resistance differential attack analysis, and resistance to cropping attacks and noise attacks are the focus of the suggested image encryption cryptosystem. The security experiment shows that the cryptosystem is adequate to achieve the desired degree of security.展开更多
In this article,we exploit the idea of network-coded cooperative protocol in aeronautical communications which combines different source nodes'information at the relay and joint decoding at the destination.Recentl...In this article,we exploit the idea of network-coded cooperative protocol in aeronautical communications which combines different source nodes'information at the relay and joint decoding at the destination.Recently,the network coding in cooperative communications has been categorized into two mainstreams,bit-level and signal-level combinations,which are both discussed in the article.And to be exclusively,multiple access relay channel(MARC)is adopted.The mutual information expressions of both above-cited network-coded protocols are deduced,which prove that without proper selected relays to perform network coding,the spatial diversity of the proposed protocol cannot be obtained.This then leads to search for the selection and grouping algorithms.An adjacency matrix is defined to describe the connectivity of the nodes in one radio contact disk,so that,the selection and grouping of algorithm is equivalent to constructing this adjacency matrix to minimize the system outage probability evaluated in term of the mutual information.Besides,a network-coded cooperative protocol requires the acyclic network,of which the construction is to avoid loop-4 in the matrix.The article ends with simulations to demonstrate the viability of the proposed algorithms.展开更多
The computationally efficient iterative receiver is investigated for Turbo-BLAST (Bell Labs layered space time) system over frequency selective fading channels. Compared with the conventional receiver based on soft ...The computationally efficient iterative receiver is investigated for Turbo-BLAST (Bell Labs layered space time) system over frequency selective fading channels. Compared with the conventional receiver based on soft interference cancellation(SIC), an iterative detection scheme based on bit-level cancellation is presented to reduce the complexity of the receiver by decomposing of an M-QAM constellation into a linear Combination of binary constellations. Simulation results demonstrate that compared with the conventional SIC scheme, the proposed scheme based on bit-level cancellation performs almost as well as the SIC scheme after several iterations while proving a lot of saving in computational complexity.展开更多
To ensure the safe transmission of image information in communication, and improve the security performance of image encryption algorithm, we proposed a color image encryption algorithm with higher security based on c...To ensure the safe transmission of image information in communication, and improve the security performance of image encryption algorithm, we proposed a color image encryption algorithm with higher security based on chaotic system. Firstly, the 2-dimensional Cubic ICMIC modulation map(2D-CIMM) is designed, which has simple form, easy to construct, and high Spectral Entropy(SE) complexity. Secondly, the hash values of the original image are used to update the initial values of the 2D-CIMM map in real time, which increases the sensitivity of the image encryption algorithm to the plaintext and improves the finite precision effect. Finally, the permutation and diffusion processes of the encryption algorithm based on bit-level are performed. In addition, simulation and performance analysis show that the proposed algorithm has higher security.展开更多
摘要This paper presents a description and performance evaluation of a new bit-level, lossless, adaptive, and asymmetric data compression scheme that is based on the adaptive character wordlength (ACW(n)) algorithm. The proposed scheme enhances the compression ratio of the ACW(n) algorithm by dividing the binary sequence into a number of subsequences (s), each of them satisfying the condition that the number of decimal values (d) of the n-bit length characters is equal to or less than 256. Therefore, the new scheme is referred to as ACW(n, s), where n is the adaptive character wordlength and s is the number of subsequences. The new scheme was used to compress a number of text files from standard corpora. The obtained results demonstrate that the ACW(n, s) scheme achieves higher compression ratio than many widely used compression algorithms and it achieves a competitive performance compared to state-of-the-art compression tools.
摘要In this paper,a novel bit-level image encryption method based on dynamic grouping is proposed.In the proposed method,the plain-image is divided into several groups randomly,then permutation-diffusion process on bit level is carried out.The keystream generated by logistic map is related to the plain-image,which confuses the relationship between the plain-image and the cipher-image.The computer simulation results of statistical analysis,information entropy analysis and sensitivity analysis show that the proposed encryption method is secure and reliable enough to be used for communication application.
摘要Military image encryption plays a vital role in ensuring the secure transmission of sensitive visual information from unauthorized access.This paper proposes a new Tri-independent keying method for encrypting military images.The proposed encryption method is based on multilevel security stages of pixel-level scrambling,bitlevel manipulation,and block-level shuffling operations.For having a vast key space,the input password is hashed by the Secure Hash Algorithm 256-bit(SHA-256)for generating independently deterministic keys used in the multilevel stages.A piecewise pixel-level scrambling function is introduced to perform a dual flipping process controlled with an adaptive key for obscuring the spatial relationships between the adjacent pixels.Adynamicmasking scheme is presented for conducting a bit-level manipulation based on distinct keys that change over image regions,providing completely different encryption results on identical regions.To handle the global correlation between large-scale patterns,a chaotic index-map system is employed for shuffling image regions randomly across the image domain based on a logistic map seeded with a private key.Experimental results on a dataset of military images show the effectiveness of the proposed encryption method in producing excellent quantitative and qualitative results.The proposed method obtains uniform histogram distributions,high entropy values around the ideal(≈8 bits),Number of Pixel Change Rate(NPCR)values above 99.5%,and low Peak Signal-to-Noise Ratio(PSNR)over all encrypted images.This validates the robustness of the proposed method against cryptanalytic attacks,verifying its ability to serve as a practical basis for secure image transmission in defense systems.
摘要针对传统检测方法在复杂干扰条件下鲁棒性不足的问题,提出一种基于混合专家(Mixture-of-Experts,MoE)网络的抗干扰检测方法,用于复杂电磁环境下正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)信号的可靠检测。依托复杂干扰条件下的OFDM信号模型,采用融合导频信息的多通道接收特征作为模型输入;设计干扰识别驱动的级联接收结构,通过干扰识别网络判别干扰类型,并根据识别结果自适应选择MoE网络中的对应专家模型,实现针对性干扰抑制;结合DeepRx检测网络实现比特级检测。仿真结果表明,在多类典型干扰场景下,所提方法相比直接检测、混合干扰训练模型以及线性最小均方误差(Linear Minimum Mean Square Error,LMMSE)检测器,能够获得更低的误码率(Bit Error Rate,BER),并表现出更稳定的检测性能,从而有效提升复杂电磁环境下OFDM系统的抗干扰检测能力。
基金supported by the National Natural Science Foundation of China (Grant No. 61672124)the Password Theory Project of the 13th Five-Year Plan National Cryptography Development Fund,China (Grant No. MMJJ20170203)+2 种基金the Liaoning Provincial Science and Technology Innovation Leading Talents Program Project,China (Grant No. XLYC1802013)the Key Research and Development Projects of Liaoning Province,China (Grant No. 2019020105-JH2/103)the Jinan City 20-University Funding Projects for Introducing Innovation Team Program,China (Grant No. 2019GXRC031)。
摘要The image's least significant bit(LSB) covers lots of the details that have been commonly used in image encryption analysis. The newly proposed fractal sorting vector(FSV) and FSV-based LSB chaotic permutation(FSV-LSBCP) is a novel chaotic image encryption cryptosystem introduced in this article. The FSV-LSBCP effectively strengthens the security of the cryptographic scheme concerning the properties of the FSV. Key analysis, statistical analysis, resistance differential attack analysis, and resistance to cropping attacks and noise attacks are the focus of the suggested image encryption cryptosystem. The security experiment shows that the cryptosystem is adequate to achieve the desired degree of security.
基金National Natural Science Foundation of China(60532030)National Outstanding Youth Science Fund(60625102)
摘要In this article,we exploit the idea of network-coded cooperative protocol in aeronautical communications which combines different source nodes'information at the relay and joint decoding at the destination.Recently,the network coding in cooperative communications has been categorized into two mainstreams,bit-level and signal-level combinations,which are both discussed in the article.And to be exclusively,multiple access relay channel(MARC)is adopted.The mutual information expressions of both above-cited network-coded protocols are deduced,which prove that without proper selected relays to perform network coding,the spatial diversity of the proposed protocol cannot be obtained.This then leads to search for the selection and grouping algorithms.An adjacency matrix is defined to describe the connectivity of the nodes in one radio contact disk,so that,the selection and grouping of algorithm is equivalent to constructing this adjacency matrix to minimize the system outage probability evaluated in term of the mutual information.Besides,a network-coded cooperative protocol requires the acyclic network,of which the construction is to avoid loop-4 in the matrix.The article ends with simulations to demonstrate the viability of the proposed algorithms.
基金The Natural Science Foundation of Jiangsu Province (BK2007192)
摘要The computationally efficient iterative receiver is investigated for Turbo-BLAST (Bell Labs layered space time) system over frequency selective fading channels. Compared with the conventional receiver based on soft interference cancellation(SIC), an iterative detection scheme based on bit-level cancellation is presented to reduce the complexity of the receiver by decomposing of an M-QAM constellation into a linear Combination of binary constellations. Simulation results demonstrate that compared with the conventional SIC scheme, the proposed scheme based on bit-level cancellation performs almost as well as the SIC scheme after several iterations while proving a lot of saving in computational complexity.
基金the National Natural Science Foundation of China (Grant Nos. 61161006 and 61573383)
摘要To ensure the safe transmission of image information in communication, and improve the security performance of image encryption algorithm, we proposed a color image encryption algorithm with higher security based on chaotic system. Firstly, the 2-dimensional Cubic ICMIC modulation map(2D-CIMM) is designed, which has simple form, easy to construct, and high Spectral Entropy(SE) complexity. Secondly, the hash values of the original image are used to update the initial values of the 2D-CIMM map in real time, which increases the sensitivity of the image encryption algorithm to the plaintext and improves the finite precision effect. Finally, the permutation and diffusion processes of the encryption algorithm based on bit-level are performed. In addition, simulation and performance analysis show that the proposed algorithm has higher security.