SPHINCS+^+ post-quantum digital signature scheme with Streebog hash function

Many commonly used public key cryptosystems will become insecure once a scalable quantum computer is built. New cryptographic schemes that can guarantee protection against attacks with quantum computers, so-called post-quantum algorithms, have emerged in recent decades. One of the most promising candidates for a post-quantum signature scheme is SPHINCS$^+$, which is based on cryptographic hash functions. In this contribution, we analyze the use of the new Russian standardized hash function, known as Streebog, for the implementation of the SPHINCS$^+$ signature scheme. We provide a performance comparison with SHA-256-based instantiation and give benchmarks for various sets of parameters.Comment: 5 pages, 2 figures, 3 table

Strong alkalinization of Chara cell surface in the area of cell wall incision as an early event in mechanoperception

AbstractMechanical wounding of cell walls occurring in plants under the impact of pathogens or herbivores can be mimicked by cell wall incision with a glass micropipette. Measurements of pH at the surface of Chara corallina internodes following microperforation of cell wall revealed a rapid (10–30s) localized alkalinization of the apoplast after a lag period of 10–20s. The pH increase induced by incision could be as large as 3 pH units and relaxed slowly, with a halftime up to 20min. The axial pH profile around the incision zone was bell-shaped and localized to a small area, extending over a distance of about 100μm. The pH response was suppressed by lowering cell turgor upon the replacement of artificial pond water (APW) with APW containing 50mM sorbitol. Stretching of the plasma membrane during its impression into the cell wall defect is likely to activate the Ca2+ channels, as evidenced from sensitivity of the incision-induced alkalinization to the external calcium concentration and to the addition of Ca2+-channel blockers, such as La3+, Gd3+, and Zn2+. The maximal pH values attained at the incision site (~10.0) were close to pH in light-dependent alkaline zones of Chara cells. The involvement of cytoskeleton in the origin of alkaline patch was documented by observations that the incision-induced pH transients were suppressed by the inhibitors of microtubules (oryzalin and taxol) and, to a lesser extent, by the actin inhibitor (cytochalasin B). The results indicate that the localized increase in apoplastic pH is an early event in mechanoperception and depends on light, cytoskeleton, and intracellular calcium

Lining Design for Alborz Tunnel in Iran

The paper describes the application of analytical methods if tunnel linings design under static, tectonic and seismic effects for the design of the transport tunnel Albors in Iran. The methods are based on solutions of the corresponding plane problems of the elasticity theory simulating the initial stress fields in the rock mass caused by gravitational or tectonic forces and actions of long arbitrary directed longitudinal (P) and shear (S) waves propagating in the plane of the tunnel cross-section. For the design of tunnel linings under seismic effects the original approach has been applied consisting in the determination of maximal compressive and tensile circumferential stresses wich may appear in points of the lining internal outline at any combinations and directions of P- and S- waves

Real-Time Synthesis is Hard!

We study the reactive synthesis problem (RS) for specifications given in Metric Interval Temporal Logic (MITL). RS is known to be undecidable in a very general setting, but on infinite words only; and only the very restrictive BRRS subcase is known to be decidable (see D'Souza et al. and Bouyer et al.). In this paper, we precise the decidability border of MITL synthesis. We show RS is undecidable on finite words too, and present a landscape of restrictions (both on the logic and on the possible controllers) that are still undecidable. On the positive side, we revisit BRRS and introduce an efficient on-the-fly algorithm to solve it

Superconductivity, Electron Paramagnetic Resonance, and Raman Scattering Studies of Heterofullerides with Cs and Mg

In the present study, the results of investigation of physical properties of heterofullerides A3−xMxC60 (A=K, Rb, Cs, M=Be, Mg, Ca, Al, Fe, Tl, x=1,2); as well as RbCsTlC60, KCsTlC60, and KMg2C60 are described. All of the fullerides were synthesized by the exchange reactions of alkaline fullerides with anhydrous metal halides. Superconductivity was found in RbCsTlC60 and KCsTlC60

Volga-Ural Sandy Plague Focus Differentiation against Epizootic Manifestations by Means of Circular Extrapolation

Displayed are the results of study of the Volga-Ural sandy plague focus spatial structure. Constructed has been the map of the area with long-lasting persistent epizootic manifestations, monitored throughout the whole period from 1926 to 2012, using method of circular extrapolation of plague microbe detection points. Epizootic area mapping and map adjustment have been carried out automatically with the help of ArcGIS-10 software. The map displays the dislocation of plague focus activity nuclei and zones of short-term epizootic process registration; identified have been their quantitative parameters. Cartographic model of plague-focal territory differentiation against epizootic manifestation index is designed for validated planning of epidemiological surveillance activities and further studies of plague enzootics issues. The data obtained can be used for epidemiological zoning of territories as regards plague