Information security risks assessment and management framework

Основная статьяProviding of information security becomes very essential for modern telecommunication networks. This task is often decided from the perspective of information security risks, but some problems arise in practice with risks assessment and management in quantitative form. They are uncertain, incomplete, fuzzy and qualitative character of source information about existing threats and vulnerabilities. In this paper we developed the framework for quantitative information security risks assessment and management under these challenges. We used the framework for risks assessment and management in electronic trading platform and found the optimal set of security safeguards

Kinematical twist-3 effects in DVCS as a quark spin rotation

We point out that the kinematical twist-3 contributions to the DVCS amplitude, required to restore electromagnetic gauge invariance of the twist-2 amplitude up to O(t/q^2), can be understood as a spin rotation applied to the twist-2 quark density matrix in the target. This allows for a compact representation of the twist-3 effects, as well as for a simple physical interpretation.Comment: 4 pages, revtex, 3 eps figures included using eps

On exotic hybrid meson production in gamma* gamma collisions

We present a theoretical study of exotic hybrid meson (JPC=1-+) production in photon-photon collisions where one of the photons is deeply virtual, including twist 2 and twist 3 contributions. We calculate the cross section of this process which turns out to be large enough to imply sizeable counting rates in the present high luminosity electron-positron colliders. We emphasize theimportance of the pi eta decay channel for the detection of the hybrid meson candidate pi_1(1400) and calculate the cross section and the angular distribution for pi eta pair production in the unpolarized case. This angular distribution is a useful tool for disentangling the hybrid meson signal from the background. Finally, we calculate the single spin asymmetry associated with one initial longitudinally polarized lepton.Comment: 13 pages, 14 figure

Increasing the quality of pseudo-random number generator based on fuzzy logic

We consider previously suggested by authors pseudorandom number generator based on fuzzy logic (FRNG) and increase its quality by increasing the period of generated series. To increase the period of FRNG we use more LFSRs in its structure. At the beginning we will study the case of combining four LFSRs in constructing the FRNG then the case of using eight LFSRs. The new version of FRNG generates pseudorandom numbers which are more close to true random series that make it more suitable and attractive for many applications related to data security and cryptography

Secure gamma generation for stream cipher based on fuzzy logic

In this paper, we propose a new approach for secure bit stream gamma generation based on the concept of fuzzy logic and linear feedback shift registers (LFSRs), combined in pseudorandom number generator based on fuzzy logic (FPRNG). The original idea for ensuring security for gamma generation is based on the initial states (the seeds) of LFSRs used in the generator. In this paper, we suggested the updated version of FPRNG. We also improve gamma security by accompaniment seed some valuable secure information. We found that configurations of membership functions (MFs) in FPRNG can significantly affect the randomness of the output stream of the developed generator. We can increase the gamma security as well as stream cipher security by keeping these configurations in secret additionally to seeds

Studying the relationship between linguistic variables and the degrees of primitive polynomials used in pseudo-random number generator based on fuzzy logic

In this paper we study the relation between linguistic variables and the degree of characteristic primitive polynomial of used LFSR in previously suggested fuzzy pseudorandom number generator FRNG, keeping the out pseudorandom series secure. This means that we should take into account two important properties: the randomness of the output and the security against correlation attacks. The first property mainly depends on selection of primitive polynomials used in constructing FRNG (this was discussed deeply in [1, 2]). The second property as described in [2] can be realized by making the output series balanced in sense that the probability of appearing the bits of each used LFSR approximately equal to others in the output stream

Wandzura-Wilczek approximation from generalized rotational invariance

We present the alternative way of derivation of the Wandzura-Wilczek relations between the kinematical twist-3 and twist-2 functions, parameterizing hadronic matrix element in two-photon processes $\gamma^{\star}\pi\to \gamma\pi$ and $\gamma^{\star}\gamma\to\pi\pi$. The new equations, providing the independence of the physical cross-sections on the choice of the light-cone direction, are suggested and explored. The amplitude of $\gamma^{\star}\gamma\to\pi\pi$ up to genuine twist-3 accuracy is found.Comment: 14 pages, Late

πη\pi\eta pair hard electroproduction and exotic hybrid mesons

We show that hard electroproduction is a promising way to study exotic hybrid mesons, in particular through the hybrid decay channel $H \to \pi\eta$. We discuss the $\pi\eta$ generalized distribution amplitude, calculate the production amplitude and propose a forward-backward asymmetry as a signal for the hybrid meson production.Comment: 4 pages, 1 figure, presented by I.V. Anikin at Xth International Conference "BARYONS'04", Palaiseau, Franc

Gauge invariance, causality and gluonic poles

We explore the electromagnetic gauge invariance of the hadron tensor of the Drell-Yan process with one transversely polarized hadron. The special role is played by the contour gauge for gluon fields. The prescription for the gluonic pole in the twist 3 correlator is related to causality property and compared with the prescriptions for exclusive hard processes. As a result of we get the extra contributions, which naively do not have an imaginary phase. The single spin asymmetry for the Drell-Yan process is enhanced by the factor of two.Comment: 9 pages, 2 figures; References and acknowledgements added

Exclusive two ρ0\rho ^0-mesons production in γγ∗\gamma\gamma^* collision

We give a theoretical description of the L3 Collaboration data on the cross-section of the exclusive two $\rho$-mesons production in $\gamma\gamma ^*$ collision with large photon virtuality. These data prove the scaling behaviour of the leading twist generalized distribution amplitude of vector mesons. They thus prove the relevance of a partonic description of the exclusive process $\gamma\gamma ^*\to\rho ^0\rho ^0$ at $Q^2\geq 1.2 {\rm GeV^2}$ and $W\leq 3.0 {\rm GeV}.$Comment: 6 pages, 1 eps figur