Detection of the botnets’ low-rate DDoS attacks based on self-similarity

An article presents the approach for the botnets’ low-rate a DDoS-attacks detection based on the botnet’s behavior in the network. Detection process involves the analysis of the network traffic, generated by the botnets’ low-rate DDoS attack. Proposed technique is the part of botnets detection system – BotGRABBER system. The novelty of the paper is that the low-rate DDoS-attacks detection involves not only the network features, inherent to the botnets, but also network traffic self-similarity analysis, which is defined with the use of Hurst coefficient. Detection process consists of the knowledge formation based on the features that may indicate low-rate DDoS attack performed by a botnet; network monitoring, which analyzes information obtained from the network and making conclusion about possible DDoS attack in the network; and the appliance of the security scenario for the corporate area network’s infrastructure in the situation of low-rate attacks

Coherent topological polariton laser

Funding: The Würzburg group acknowledges support from the DFG through the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter “ct.qmat” (EXC 2147, project‐id 39085490) and the doctoral training program “Elitenetzwerk Bayern". S.H. acknowledges support by the EPSRC ”Hybrid Polaritonics” Grant (EP/M025330/1). M.S., I.V. and I.G.S acknowledge the support by the Institute for Basic Science in Korea (Project No.~IBS-R024-D1). T.H. acknowledges support by the German Academic Scholarship Foundation.Topological concepts have been applied to a wide range of fields in order to successfully describe the emergence of robust edge modes that are unaffected by scattering or disorder. In photonics, indications of lasing from topologically protected modes with improved overall laser characteristics were observed. Here, we study exciton-polariton microcavity traps that are arranged in a one-dimensional Su-Schrieffer-Heeger lattice and form a topological defect mode from which we unequivocally observe highly coherent polariton lasing. Additionally, we confirm the excitonic contribution to the polariton lasing by applying an external magnetic field. These systematic experimental findings of robust lasing and high temporal coherence are meticulously reproduced by a combination of a generalized Gross-Pitaevskii model and a Lindblad master equation model. Thus, by using the comparatively simple SSH geometry, we are able to describe and control the exciton-polariton topological lasing, allowing for a deeper understanding of topological effects on microlasers.PostprintPeer reviewe

EXPERIMENTAL INVESTIGATION OF EXFOLIATION FAILURE OF IONIC CRYSTALS, IRRADIATED BY A HEAVY-CURRENT ELECTRON BEAM

The investigation of physical processes, determining the behaviour of solid bodies at the ultra-short external action - impulse electron irradiation - is the aim of the paper. As a result the behaviour of ionic crystals on the level of dislocations at the first stage of failure at the given method of lagging has been investigted for the first time. The kinetics of the formation of failure structures has been investigated. The type of an admixture, responsible for the detected for the first time process of the dynamic pore formation has been investigated. The results obtained may be used at the forecasting of the behaviour of solid bodies under conditions of the intensive external action by high-power pulses of small durationAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio

Phase fractionation of chemical elements in the mixing zones of acidic volcanic and sea waters: experimental modeling data

Abstract—: Experiments on modeling the phase fractionation of trace elements (Mn, Co, Ni, Cu, Zn, Cd, Pb, Tl, Ga, Y, REE, V, As, Sb, and U) at interaction between acidic volcanic waters with seawater, accompanied by the sequential precipitation of Fe and Al hydroxides, show that the coprecipitation efficiency of various trace elements with Fe and Al hydroxides differs. The most dramatic differences were found for Ga and REE: Ga is predominantly accommodated by Fe hydroxide, whereas REE are bound mostly to Al hydroxide. It was established that, in addition to pH value, the degree of coprecipitation of trace elements also depends on the relative volume fraction of seawater, with its increase likely leading a shift in the adsorption equilibrium and, as a consequence, to a change in the coprecipitation efficiency of trace elements

Sorption–desorption transformation of the runoff of dissolved microelements at river–sea geochemical barrier (based on data of experimental laboratory simulation)

Abstract: A new method was used for experimental simulation of the sorption–desorption transformation of microelement composition of the adsorbed complex of solid substances of river runoff at the interaction with seawater. The experimental results suggest the conclusion that a change of freshwater to marine conditions is accompanied by desorption of some elements and sorption of others. The desorption increases the runoff into the World Ocean of dissolved forms of manganese, cobalt, nickel, cadmium, thallium, and barium by 102, 21.2, 4.0, 16.2, 4.8, and 21.1%, respectively, while the sorption leads to a decrease of the global river runoff of dissolved lead and cesium by 9.4 and 2.6%

Distributed Malware Detection System based on Decentralized Architecture in Local Area Networks

The paper proposes the architecture of a distributed malware detection system based on decentralized architecture in local area computer networks. Its feature is the synthesis of its requirements of distribution, decentralization, multilevel. This allows you to use it autonomously. In addition, the feature of the components of the system is the same organization, which allows the exchange of knowledge in the middle of the system, which, unlike the known systems, allows you to use the knowledge gained by separate parts of the system in other parts. The developed system allows to fill it with subsystems of detection of various types of malicious software in local area networks. The paper presents the results of experiments on the use of the developed system for the detection of metamorphic viruses

Distributed System for Detecting the Malware in LAN

The paper proposes the architecture of distributed multilevel detection system of malicious software in local area networks. Its feature is the synthesis of its requirements of distribution, decentralization, multilevel. This allows you to use it autonomously. In addition, the feature of autonomous program modules of the system is the same organization, which allows the exchange of knowledge in the middle of the system, which, unlike the known systems, allows you to use the knowledge gained by separate parts of the system in other parts. The developed system allows to fill it with subsystems of detection of various types of malicious software in local area networks

Transformation of the major and trace element composition of dissolved matter runoff in the mouths of medium and small rivers of Russia’s Black Sea coast

Abstract: Based on field observations, the regularities of dissolved matter migration in the mouth areas of rivers of Russia’s Black Sea coast (the Anapka, Ashamba, Mezyb, Hotetsai, Vulan, Kudepsta, and Mzymta rivers) were studied. The conservative behavior (a linear form of the relationship between the component concentration and chloride content) was established for a number of major ions and trace elements: Na, K, Mg, SO4, Li, Rb, Cs, Sr, Co, Ni, Cu, Cd, Sb, Ga, B, F, V, As, Mo, and U. The conditionally nonconservative behavior of calcium and hydrocarbonates also actually corresponds to the conservative behavior, since their excess in the mouths of some rivers is associated with the influx of dispersed groundwater runoff into the mixing zone, in addition to river water. The nonconservative behavior (nonlinear form of the relationship between the component concentration and chloride content, indicating its participation in autochthonous processes in the mixing zone between river and sea water masses) is typical of nutrients involved in production–breakdown (P, Si) and sorption–desorption (P) processes; barium, to a greater or lesser extent is desorbed from river suspended particulate matter (from ∼0 to 390% of its concentration in river water), as well as for Mn, Fe, Pb, Al, Ti, Y, and rare-earth elements, which are removed from the solution during coagulation and flocculation of organic and organomineral colloids (from ∼0 to 85%). The spatiotemporal variability of the distribution of dissolved major and trace elements in the mixing zone between river and sea water masses depends on the variability of the chemical composition of continental runoff and differences in element concentrations at the river and sea boundaries of the mixing zone: an increase in this levels the influence of the first factor. Earlier data revealed the similarity of types of distribution of dissolved major and trace elements in the mouths of large and small rivers of the Russian sectors of the Black and Caspian seas, which differs only in the degree of involvement of elements in certain autochthonous processes at the mouth of each river in a specific period of time