Cryptanalysis of the Cryptosystems Based on the Generalized Hidden Discrete Logarithm Problem

In this paper, we will show the hidden discrete logarithm problem(HDLP) and the generalized form of HDLP(GHDLP) over non-commutative associative algebras (FNAAs) can be reduced to discrete logarithm problem(DLP) in a finite field through analyzing the eigenvalues of the representation matrix. Through the analysis of computational complexity, we will show that HDLP and GHDLP is not are not good improvements of DLP.With all the instruments in hand, we will show how some schemes based on GHDLP can be broken. Thus we can conclude that, all ideas of constructing cryptographic schemes based on the two problem are of no practical significance

Research on the interpretation method of channel waves for various abnormal bodies in geologically transparent working faces

The transparency of mine geology is a new requirement for safe and efficient mining of coal mines. For working faces with complex geological conditions, channel wave detection technology is one of the commonly used geophysical prospecting methods. If there are multiple geological anomalies on the working face, its attributes cannot be accurately determined. Distinguish and explain. Taking a working face in Yangquan, Shanxi as an example, a three-dimensional wave field simulation was carried out on a working face including faults, collapsed columns, thin coal belts, and deflection. Analysis of dispersion characteristics; combined with the numerical model of the longitudinal wave amplitude and velocity, shear wave amplitude and velocity, high-frequency groove wave amplitude and velocity, and low-frequency groove wave amplitude and velocity 8 types of CT inversion imaging, the fault, collapse column, thin different response characteristics of four geological anomalies, coal belt and flexure, on channel wave attributes. The results show that: ①The main frequency and velocity of the channe wave anomaly caused by the fault is basically the same as that of the coal seam without geological anomaly. The amplitude of shear wave, high frequency and low frequency channe wave can significantly identify the fault, and the speed of shear wave, high frequency channe wave and low frequency channe wave can be compared. Significantly identify faults, the longitudinal wave amplitude and longitudinal wave velocity cannot effectively identify the fault; ②The single shot characteristics of the collapsed column are characterized by low-order weakening and high-order enhancement. The amplitude of shear wave, high frequency, and low frequency channe wave can significantly identify the collapsed column, shear wave, and high frequency. The frequency slot wave velocity can identify the collapse column more significantly, while the longitudinal wave amplitude, longitudinal wave velocity and low frequency slot wave velocity cannot effectively identify the collapse column; ③The main frequency of the thin coal belt is basically unchanged, the speed is reduced, the high frequency slot wave amplitude and velocity, low frequency The amplitude and velocity of the channe wave can distinguish thin coal belts, the amplitude of longitudinal wave and transverse wave can distinguish thin coal belts significantly, and the amplitude of longitudinal wave and transverse wave cannot effectively identify thin coal belts; ④The amplitude of the deflection spectrum is enhanced, and the high frequency channe The wave amplitude and the low-frequency groove wave amplitude can distinguish the deflection more significantly, and the other properties of the groove wave are not obvious in the recognition of the deflection. According to the response characteristics of different geological anomalies on single shot, frequency dispersion, frequency spectrum and wavefield CT imaging, the geological recognition of channe wave anomalies is realized, and the shape, location and size of various geological anomalies are accurately explained, which is geologically transparent. The establishment of the chemical working face laid the “material” foundation

Effect of microstructure on corrosion resistance and anodising behaviour of AA 2099-T8 aluminium alloy

The effect of microstructure on corrosion resistance and anodising behaviour of a 3rd generation lithium-containing aluminium alloy, AA 2099-T8, has been studied. Microstructural characterisation of the alloy has shown elongated grains with high angle grain boundaries and approximately equiaxed subgrains with low angle grain boundaries. Two types of constituent particles of high and reduced contents of copper were found, which are present individually or in the form of multiphase particles. The alloy also contains rod-like Al-Cu-Mn-Li and spherical (Al3Zr) dispersoids, and fine age hardening precipitates of T1 (Al2CuLi), (Al3Li) and (Al2Cu).Immersion testing in a chloride-containing solution revealed two types of localised corrosion sites: one was initiated from intermetallics and quickly became passivated; the other lasted for the course of testing, with extensive boundary attack. The latter has been correlated to grains and subgrains with relatively high stored energy.Alkaline etching removed intermetallics from alloy surface; generated a copper-enriched layer in the alloy matrix immediately beneath the residual alumina film; and gradually developed a surface nanotexture. The surface nanotexture has been correlated to the formation of copper-rich nanoparticles within the copper-enriched layer.Anodising the alloy in tartaric-sulphuric acid disclosed that copper in the alloy matrix could be occluded in the anodic film material as copper-rich nanoparticles or be oxidized and incorporated into the film material as copper ions, depending on the anodising voltage. In the latter case, the process was accompanied by oxygen gas generation within the film material, forming anodic films with lateral porosity. Intermetallics of different compositions behaved differently during anodising, leading to modification of the morphology and composition of anodic films. Concerning the effect of alkaline etching on anodising behaviour of the alloy, the removal of intermetallics increased anodising efficiency; the pre-developed copper-enriched layer advanced the establishment of the steady-state film/alloy interface. Variation of copper-enriched layer structure is revealed by the detection of copper-rich nanoparticles in the copper-enriched layer. The copper-rich nanoparticles have structures consistent with either θ", θ' or θ phases. Machining damage can be detected not only by chromic acid anodising (CAA) but also by tartaric-sulphuric acid anodising (TSAA). Neither CAA nor TSAA can be used for detecting shallow corrosion pits.EThOS - Electronic Theses Online ServiceEPSRC LATEST Portfolio PartnershipAirbus Operations LimitedGBUnited Kingdo

Single‐Cell Transcriptome Atlas and Regulatory Dynamics in Developing Cotton Anthers

Plant anthers are composed of different specialized cell types with distinct roles in plant reproduction. High temperature (HT) stress causes male sterility, resulting in crop yield reduction. However, the spatial expression atlas and regulatory dynamics during anther development and in response to HT remain largely unknown. Here, the first single‐cell transcriptome atlas and chromatin accessibility survey in cotton anther are established, depicting the specific expression and epigenetic landscape of each type of cell in anthers. The reconstruction of meiotic cells, tapetal cells, and middle layer cell developmental trajectories not only identifies novel expressed genes, but also elucidates the precise degradation period of middle layer and reveals a rapid function transition of tapetal cells during the tetrad stage. By applying HT, heterogeneity in HT response is shown among cells of anthers, with tapetal cells responsible for pollen wall synthesis are most sensitive to HT. Specifically, HT shuts down the chromatin accessibility of genes specifically expressed in the tapetal cells responsible for pollen wall synthesis, such as QUARTET 3 (QRT3) and CYTOCHROME P450 703A2 (CYP703A2), resulting in a silent expression of these genes, ultimately leading to abnormal pollen wall and male sterility. Collectively, this study provides substantial information on anthers and provides clues for heat‐tolerant crop creation

Genome-wide association analysis revealed genetic variation and candidate genes associated with the yield traits of upland cotton under drought conditions

Drought is one of the major abiotic stresses seriously affecting cotton yield. At present, the main cotton-producing areas in China are primarily arid and semiarid regions. Therefore, the identification of molecular markers and genes associated with cotton yield traits under drought conditions is of great importance for stabilize cotton yield under such conditions. In this study, resequencing data were used to conduct a genome-wide association study (GWAS) on 8 traits of 150 cotton germplasms. Under drought stress, 18 SNPs were significantly correlated with yield traits (single-boll weight (SBW) and seed (SC)), and 8 SNPs were identified as significantly correlated with effective fruit shoot number (EFBN) traits (a trait that is positively correlated with yield). Finally, a total of 15 candidate genes were screened. The combined results of the GWAS and transcriptome data analysis showed that four genes were highly expressed after drought stress, and these genes had significantly increased expression at 10, 15 and 25 DPA of fiber development. qRT-PCR was performed on two samples with drought tolerance extremes (drought-resistant Xinluzao 45 and drought-sensitive Xinluzao 26), revealing that three of the genes had the same differential expression pattern. This study provides a theoretical basis for the genetic analysis of cotton yield traits under drought stress, and provides gene resources for improved breeding of cotton yield traits under drought stress

Enhanced corrosion protection by Al surface immobilization of in-situ grown layered double hydroxide films co-intercalated with inhibitors and low surface energy species

Abstract(#br)In this work, a novel in-situ grown layered double hydroxide (LDH) film co-intercalated with inhibitors (vanadates) and low surface energy substance (laurates) was immobilized on Al substrates. A long-term monitoring of electrochemical impedance spectra (EIS) of the various samples in 3.5 wt.% NaCl solution demonstrated the synergetic protection of the intercalated two functional species. Meanwhile, the X-ray diffraction (XRD) result of the samples after immersion in NaCl solution for a long time presented the anion-exchange process between vanadates/laurates and chlorides. The synergetic effect of the two species loaded film significantly contributed to the enhanced long-term corrosion protection of aluminum