Leveraging ROTI map derived from Indonesian GNSS receiver network for advancing study of Equatorial Plasma Bubble in Southeast/East Asia

This paper highlights the crucial role of Indonesia’s GNSS receiver network in advancing Equatorial Plasma Bubble(EPB)studies in Southeast and East Asia,as ionospheric irregularities within EPB can disrupt GNSS signals and degrade positioning accuracy.Managed by the Indonesian Geospatial Information Agency(BIG),the Indonesia Continuously Operating Reference Station(Ina-CORS)network comprises over 300 GNSS receivers spanning equatorial to southern low-latitude regions.Ina-CORS is uniquely situated to monitor EPB generation,zonal drift,and dissipation across Southeast Asia.We provide a practical tool for EPB research,by sharing two-dimensional rate of Total Electron Content(TEC)change index(ROTI)derived from this network.We generate ROTI maps with a 10-minute resolution,and samples from May 2024 are publicly available for further scientific research.Two preliminary findings from the ROTI maps of Ina-CORS are noteworthy.First,the Ina-CORS ROTI maps reveal that the irregularities within a broader EPB structure persist longer,increasing the potential for these irregularities to migrate farther eastward.Second,we demonstrate that combined ROTI maps from Ina-CORS and GNSS receivers in East Asia and Australia can be used to monitor the development of ionospheric irregularities in Southeast and East Asia.We have demonstrated the combined ROTI maps to capture the development of ionospheric irregularities in the Southeast/East Asian sector during the G5 Geomagnetic Storm on May 11,2024.We observed simultaneous ionospheric irregularities in Japan and Australia,respectively propagating northwestward and southwestward,before midnight,whereas Southeast Asia’s equatorial and low-latitude regions exhibited irregularities post-midnight.By sharing ROTI maps from Indonesia and integrating them with regional GNSS networks,researchers can conduct comprehensive EPB studies,enhancing the understanding of EPB behavior across Southeast and East Asia and contributing significantly to ionospheric research.

改进RSA算法及二维码在农产品追溯系统的应用

随着人们生活水平提升,食品质量安全特别是生鲜水果蔬菜的质量安全受到普遍关注,社会各界都致力于农产品全过程质量安全管控,保障消费者食用安全,农产品追溯技术应运而生。本文运用改进RSA算法,结合二维码技术设计果蔬农产品追溯系统,重点分析了在果蔬农产品供应链流通过程中的重要环节以及重点溯源信息,应用改进RSA算法保障追溯系统核心数据安全,提升了农产品追溯系统的可靠性和易用性。

RSA算法中大素数快速生成和运算方法实现

RSA算法是目前应用最为广泛的公钥密码算法,其安全性是以大质数因子的分解不存在经典的多项式算法为基础,对极大整数进行因数分解的难度决定了RSA算法的可靠性。密钥的生成需要依赖于大素数,而大数的产生由于其复杂性和计算成本较高,成为影响RSA算法效率的重要因素。文章提出并实现了一种快速产生大数的方法,使用随机数生成器生成指定范围内的随机数,并利用素性测试算法对生成的随机数进行素性验证;针对不符合条件的数值进行调整和重新生成,直至得到符合要求的大素数。测试验证结果表明,文章提出的快速生成大数方法能显著提高大素数生成的效率,大幅缩短大素数的生成时间,有效保证生成数的素性和安全性。

基于RSA的矢量地图非对称无损加密算法

目前矢量地图加密算法主要采用对称加密,加密和解密采用相同密钥,导致密钥存在泄露风险;而非对称加密需要对数据进行整数化,会影响数据精度。针对上述问题,该文提出一种基于RSA的矢量地图非对称无损加密算法。首先,对矢量地图坐标值的整数部分进行动态选取,运用RSA算法对选取的数据进行非对称加密;然后,使用SHA-512生成混沌系统的密钥,利用混沌系统对非对称加密后的矢量地图坐标点进行置乱重组,实现一图一密的加密效果。实验结果表明,该算法可以对所有类型的矢量地图进行加密和无损解密,在保证数据完整性和精度的同时,提高了安全性,且该算法也适用于三维点云、倾斜摄影三维模型等地理空间数据类型的加密。

有限域上RSA-ELGamal加密及数字签名方案

基于增强的RSA和ELGamal加密算法,提出了有限域上多项式的RSA-ELGamal加密方案.新的加密方案基于大整数分解问题(IFP)和难解的离散对数问题(DLP)的结合,使其安全性高于单个使用有限域上多项式形式的RSA加密算法和ELGamal加密体制.新提出的加密方案可对多个明文进行加密,在对明文加密时通过引入RSA的公钥对明文进行隐藏,加密效率高,安全性强.在新加密方案基础上引入单向哈希函数,并提出相应的数字签名方案,签名方案利用多个接收者分别验证和加密消息,进一步增强签名被攻击的概率.加密方案和数字签名的安全性主要基于大整数的分解和离散对数求解的双重困难问题,使得签名具有不可攻击性,提高此类签名方案的安全性.

基于流水线的RSA加密算法硬件实现

针对硬件实现高位RSA加密算法成本比较高的问题,在传统的基4蒙哥马利(Montgomery)算法上进行改进。首先引入CSA加法器快速完成大数的加法计算;然后在后处理上做优化,以减少每次蒙哥马利计算的大数个数;最后在计算RSA加密算法时加入了流水线,在并行执行RSA加密的条件下降低硬件资源的使用。在Xilinx XC7K410T系列的FPGA开发板上的实验结果表明,在保证加密速率的前提下,改进的RSA加密算法结构使用的硬件资源是原来并行结构的1/2,而且可以在更高的频率下工作。

一种基于模板的RSA-CRT模约减攻击方法

目前针对RSA-CRT的建模类攻击研究较少,本文以模约减操作为研究对象,提出了一种针对RSA-CRT实现的模板攻击方法.该方法的核心是解决了如何由模约减后中间值的汉明重量恢复RSA-CRT私钥的难题.该方法的特点是基于模约减后中间值的汉明重量模型建模,通过采集选择密文模约减的能量迹进行模板匹配获取模约减后中间值的汉明重量,由汉明重量变化值恢复中间值,进一步恢复RSA-CRT算法的私钥.另外,该方法的优点在于理想情况下,基于中间值汉明重量模型建立的模板之间可以共用,且对中间值以多少位大小建模没有限制,可以选择字节大小,64位大小,甚至私钥p相同大小,实际环境中可根据泄露信息情况进行选取.最后,本文选择对中间值的最低字节进行建模,验证了该方法的可行性,并给出了防护建议.

基于自注意力机制和RSA加密的图像融合算法

传统的红外和可见光图像融合方法在不同环境中的应用效果表现不稳定。针对此问题,提出了一种基于自注意力机制和RSA(Rivest-Shamir-Adleman)加密的图像融合算法。首先,在图像融合部分提出了一种自适应权重学习模块,该模块可以实现动态权重分配。其次,提出了一种动态密钥管理机制并将其融入RSA加密算法中,将融合后的图像进行加密,提高图片的安全性。实验结果表明,与Densefusion、FusionGAN、IFCNN、TarDAL四种融合方法相比,所提方法的客观评价指标MI、VIF、SSIM、FMIdct、Qabf分别平均提升了16.35%、26.56%、14.58%、18.27%、20.79%。此外,对加密后的图像进行安全性分析,实验表明该算法具有较高的安全性。

RSA算法赋能区块链的素材版权保护系统

传统的版权保护机制由于采用中心化管理模式,存在缺乏有效追溯性、数据隐私保护有限等问题,面对大数据时代的挑战显得力不从心。区块链技术由于其去中心化、不可篡改及可追溯性等特点,为素材版权保护提供了新的可能性。对区块链技术进行研究,结合RSA加密算法与TBFT共识算法,构建了一个素材版权保护系统,并通过仿真实验验证了其有效性。该系统能够有效实现素材的授权管理和版权溯源保护,为素材内容的版权保护提供了一种新的解决方案。

基于RSA算法的无线通信网络数据加密传输方法

常规的无线通信网络数据加密传输方法以密钥对进行加密和解密,经常出现数据传输失效、数据被篡改等问题,影响网络数据的安全。因此,设计了基于RSA算法的无线通信网络数据加密传输方法。生成通信网络数据传输RSA公钥密码,在通信网络数据传输双方生成公钥数字签名,公开加密数据,并验证数字签名的来源,确保数据加密传输的安全性。基于RSA建立无线通信网络数据加密传输认证机制,在加密传输双方信赖的安全通道中进行身份认证,互相交换密文信息与数字签名,从而避免数据被窃听、篡改的问题。采用对比实验,验证了该方法的加密传输安全性更高,能够应用于实际生活中。

基于改进RSA算法的物联网身份认证优化方法

针对由于噪声影响,导致物联网身份认证准确率和效率较低的问题,提出了一种新的基于改进RSA(Rivest-Shamir-Adleman)算法的物联网身份认证优化方法。该方法通过构建传输信道模型获取用户身份信息,并且构建降噪模型降噪预处理用户身份信息数据;针对处理后的数据,提取用户身份特征信息,以此构建物联网身份认证算法;在此基础上,引入RSA算法,加密处理用户身份信息数据,实现物联网身份认证优化。实验结果表明,该方法身份认证准确率达到97.0%以上,认证效率较高,并且该方法不易受噪声环境的影响,在含噪声的条件下,其认证率与理想认证率的最高误差仅为3.7%,具备了可行性和有效性。

基于RSA算法和Chen超混沌系统的数字图像加密研究

将Chen超混沌系统与RSA加密体制相结合,提出了新的非对称图像加密方案.利用非对称加密体制RSA算法生成Chen超混沌系统的初始值参数,并迭代生成密钥流,实现图像信息的3次隐藏得到密文图像.为了实现明文像素点的信息扩散到整个密文图像中,加取模扩散算法循环2次.结果表明,RSA算法和Chen超混沌系统的图像加密方案是有效的,而且具有较强的抗攻击性以及密钥敏感性.另外,该加密方案的安全性依赖于RSA算法,从而具有较高安全性.

Beidou receiver based on anti-jamming antenna arrays with self-calibration for precise relative positioning

Unmanned aerial vehicles(UAVs)may be subjected to unintentional radio frequency interference(RFI)or hostile jamming attack which will lead to fail to track global navigation satellite system(GNSS)signals.Therefore,the simultaneous realization of anti-jamming and high-precision carrier phase difference positioning becomes a dilemmatic problem.In this paper,a distortionless phase digital beamforming(DBF)algorithm with self-calibration antenna arrays is proposed,which enables to obtain distortionless carrier phase while suppressing jamming.Additionally,architecture of high precision Beidou receiver based on anti-jamming antenna arrays is proposed.Finally,the performance of the algorithm is evaluated,including antenna calibration accuracy,carrier phase distortionless accuracy,and carrier phase measurement accuracy without jamming.Meanwhile,the maximal jamming to signal ratio(JSR)and real time kinematic(RTK)positioning accuracy under wideband jamming are also investigated.The experimental results based on the real-life Beidou signals show that the proposed method has an excellent performance for precise relative positioning under jamming when compared with other anti-jamming methods.

Fast measurement and prediction method for electromagnetic susceptibility of receiver

Aiming at evaluating and predicting rapidly and accurately a high sensitivity receiver’s adaptability in complex electromagnetic environments,a novel testing and prediction method based on dual-channel multi-frequency is proposed to improve the traditional two-tone test.Firstly,two signal generators are used to generate signals at the radio frequency(RF)by frequency scanning,and then a rapid measurement at the intermediate frequency(IF)output port is carried out to obtain a huge amount of sample data for the subsequent analysis.Secondly,the IF output response data are modeled and analyzed to construct the linear and nonlinear response constraint equations in the frequency domain and prediction models in the power domain,which provide the theoretical criteria for interpreting and predicting electromagnetic susceptibility(EMS)of the receiver.An experiment performed on a radar receiver confirms the reliability of the method proposed in this paper.It shows that the interference of each harmonic frequency and each order to the receiver can be identified and predicted with the sensitivity model.Based on this,fast and comprehensive evaluation and prediction of the receiver’s EMS in complex environment can be efficiently realized.

Wideband spectrum sensing using step-sampling based on the multipath nyquist folding receiver

Wideband spectrum sensing with a high-speed analog-digital converter(ADC) presents a challenge for practical systems.The Nyquist folding receiver(NYFR) is a promising scheme for achieving cost-effective real-time spectrum sensing,which is subject to the complexity of processing the modulated outputs.In this case,a multipath NYFR architecture with a step-sampling rate for the different paths is proposed.The different numbers of digital channels for each path are designed based on the Chinese remainder theorem(CRT).Then,the detectable frequency range is divided into multiple frequency grids,and the Nyquist zone(NZ) of the input can be obtained by sensing these grids.Thus,high-precision parameter estimation is performed by utilizing the NYFR characteristics.Compared with the existing methods,the scheme proposed in this paper overcomes the challenge of NZ estimation,information damage,many computations,low accuracy,and high false alarm probability.Comparative simulation experiments verify the effectiveness of the proposed architecture in this paper.

可信执行环境下基于RSA算法的软件侧信道攻击研究

为了提升RSA(公钥加密)算法对于侧信道攻击的抵抗能力,最大程度保障软件信息安全,避免计算机系统瘫痪,研究可信执行环境下基于RSA算法的软件侧信道攻击抵抗。依据侧信道的时间、电磁/功耗分析、能量消耗等多种攻击方式,采用RSA算法通过对计算机的硬盘序列号信息加密,完成软件信息加密,并将蒙哥马利改进左右滑动窗口方式引入RSA算法,加快RSA算法模幂运算的速度,减少运算量,实现侧信道攻击最佳防御,为软件运行提供一个可信执行环境。实验表明:改进后的RSA算法,对于不同比特位计算的能量消耗值相近,可以使攻击者无法通过应用不同比特位计算时消耗的能量分析出密钥;同时,对于多种侧信道攻击方式,该方法能够有效地进行抵抗,使攻击者无法分析出密钥。

Crustal structure in the Anyuan Coal Mine and its adjacent areas of Jiangxi Province by P-wave receiver functions

We collected high-quality teleseismic events recorded by 12 broadband seismographs deployed in the Anyuan Coal Mine and its adjacent areas in Pingxiang City,Jiangxi Province for nearly two years.The H-κ-c stacking method was employed to obtain the crustal thickness and Poisson's ratio distribution,then the characteristics of crustal structure below the stations were obtained by using the time-domain linear inversion method.The crustal thickness in the Anyuan Coal Mine and its adjacent areas ranges from approximately 32~35 km,with an average thickness of 33 km,which is consistent with the crustal thickness results in South China from previous studies using the receiver function method.The average Poisson's ratio of the crustal bulk composition in the study area varies between 0.22 and 0.25,which is lower than the global value with a 0.27 average,indicating a predominantly intermediate-acidic or felsic crustal composition.There is a weak negative correlation between Poisson's ratio and crustal thickness estimates in the Anyuan Coal Mine and its adjacent areas,suggesting that the absence of mafic-ultramafic materials in the lower crust is associated with the process of crustal delamination.The velocity inversion results indicate that the crustal structure including three velocity discontinuity interfaces,with the first at a depth of approximately 1.5 km,the second at about 10~15 km,and the third being the Moho.The study also indicates that the results obtained by the H-κ-c stacking method are significantly better than those obtained by the H-κmethod,effectively reducing the standard deviation and dispersion of crustal thickness and vP/vSratio.

Crustal and uppermost mantle structure of the northeastern Qinghai-Xizang Plateau from joint inversion of surface wave dispersions and receiver functions with P velocity constraints

Lithospheric structure beneath the northeastern Qinghai-Xizang Plateau is of vital significance for studying the geodynamic processes of crustal thickening and expansion of the Qinghai-Xizang Plateau. We conducted a joint inversion of receiver functions and surface wave dispersions with P-wave velocity constraints using data from the Chin Array Ⅱ temporary stations deployed across the Qinghai-Xizang Plateau. Prior to joint inversion, we applied the H-κ-c method(Li JT et al., 2019) to the receiver function data in order to correct for the back-azimuthal variations in the arrival times of Ps phases and crustal multiples caused by crustal anisotropy and dipping interfaces. High-resolution images of vS, crustal thickness, and vP/vSstructures in the Qinghai-Xizang Plateau were simultaneously derived from the joint inversion. The seismic images reveal that crustal thickness decreases outward from the Qinghai-Xizang Plateau. The stable interiors of the Ordos and Alxa blocks exhibited higher velocities and lower crustal vP/vSratios. While, lower velocities and higher vP/vSratios were observed beneath the Qilian Orogen and Songpan-Ganzi terrane(SPGZ), which are geologically active and mechanically weak, especially in the mid-lower crust.Delamination or thermal erosion of the lithosphere triggered by hot asthenospheric flow contributes to the observed uppermost mantle low-velocity zones(LVZs) in the SPGZ. The crustal thickness, vS, and vP/vSratios suggest that whole lithospheric shortening is a plausible mechanism for crustal thickening in the Qinghai-Xizang Plateau, supporting the idea of coupled lithospheric-scale deformation in this region.

High Sensitivity Digital Instantaneous Frequency Measurement Receiver for Precise Frequency Analysis

There are numerous applications, such as Radar, that leverage wideband technology. However, the presence of noise introduces certain limitations and challenges. It is crucial to harness wideband technology for applications demanding the rapid and precise transmission of diverse information from one point to another within a short timeframe. The ability to report a signal without tuning within the input bandwidth stands out as one of the advantages of employing a digital wideband receiver. As indicated, a digital wideband receiver plays a pivotal role in achieving high precision and accuracy. The primary distinction between Analog and Digital Instantaneous Frequency Measurement lies in the fact that analog Instantaneous Frequency Measurement (IFM) receivers have traditionally covered extensive input bandwidths, reporting one accurate frequency per short pulse. In the contemporary landscape, digital IFM systems utilize high-sampling-rate Analog-to-Digital Converters (ADC) along with Hilbert transforms to generate two output channels featuring a 90-degree phase shift. This paper explores the improvement of sensitivity in current digital IFM receivers. The optimization efforts target the Hilbert transform and autocorrelations architectures, aiming to refine the system’s ability to report fine frequencies within a noisy wide bandwidth environment, thereby elevating its overall sensitivity.

RSA算法在QR码防伪技术中的应用探究

作为近年来快速崛起的二维条码技术,二维码(quick response code,QR)引发了人们生活方式的革命性变化,并在社会生活各领域中获得了广泛应用。QR码防伪技术作为QR码的重要应用之一,其中相关算法的时间效率和安全性能受到了业界的广泛关注。本文主要聚焦于QR码防伪领域中RSA(Rivest-Shamir-Adleman)算法的优化问题,将深入探讨传统RSA算法在大素数分解和解密模幂运算方面的优化策略。基于这些探讨,本文综述现有的QR码防伪溯源系统架构,对比了各种方案的时间性能,旨在为RSA算法在QR码防伪技术中的进一步应用和优化提供新的视角和思考。