A Verifiable Fully Homomorphic Encryption Scheme for Cloud Computing Security

Performing smart computations in a context of cloud computing and big data is highly appreciated today. Fully homomorphic encryption (FHE) is a smart category of encryption schemes that allows working with the data in its encrypted form. It permits us to preserve confidentiality of our sensible data and to benefit from cloud computing powers. Currently, it has been demonstrated by many existing schemes that the theory is feasible but the efficiency needs to be dramatically improved in order to make it usable for real applications. One subtle difficulty is how to efficiently handle the noise. This paper aims to introduce an efficient and verifiable FHE based on a new mathematic structure that is noise free

Polycyclic Aromatic Hydrocarbons (PAHs) and Their Influence to Some Aquatic Species

Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous environmental pollutants generated primarily during the incomplete combustion of organic materials (e.g., coal, oil, petrol, and wood). Many PAHs have toxic, mutagenic, and/or carcinogenic functions. PAHs are highly lipid soluble which lead to a fast absorption by the gastrointestinal tract of marine mammals. They are immediately distributed in a vast variety of tissues with a notable tendency for localization in body fat. Metabolism of PAHs is obtained via the cytochrome P450-mediated mixed function oxidase system with oxidation or hydroxylation as the first step. PAHs are environmental contaminants that pose significant risk to health of fish. The effect of PAHs on fish is a topic of rising attention in a lot of countries. Different studies using the bile metabolites separated by high-performance liquid chromatography with fluorescence detection were presented. The aim is to compare the levels of PAH metabolites in fish from different areas and fish species. The major metabolite present in all fish was 1-hydroxypyrene. The data confirm the importance of 1-hydroxypyrene as the key PAH metabolite in fish bile and suggest that the European eel is an ideal species for monitoring PAHs

A Like ELGAMAL Cryptosystem But Resistant To Post-Quantum Attacks

The Modulo 1 Factoring Problem (M1FP) is an elegant mathematical problem which could be exploited to design safe cryptographic protocols and encryption schemes that resist to post quantum attacks. The ELGAMAL encryption scheme is a well-known and efficient public key algorithm designed by Taher ELGAMAL from discrete logarithm problem. It is always highly used in Internet security and many other applications after a large number of years. However, the imminent arrival of quantum computing threatens the security of ELGAMAL cryptosystem and impose to cryptologists to prepare a resilient algorithm to quantum computer-based attacks. In this paper we will present a like-ELGAMAL cryptosystem based on the M1FP NP-hard problem. This encryption scheme is very simple but efficient and supposed to be resistant to post quantum attacks

An improved Framework for Biometric Database’s privacy

Security and privacy are huge challenges in biometric systems. Biometrics are sensitive data that should be protected from any attacker and especially attackers targeting the confidentiality and integrity of biometric data. In this paper an extensive review of different physiological biometric techniques is provided. A comparative analysis of the various sus mentioned biometrics, including characteristics and properties is conducted. Qualitative and quantitative evaluation of the most relevant physiological biometrics is achieved. Furthermore, we propose a new framework for biometric database privacy. Our approach is based on the use of the promising fully homomorphic encryption technology. As a proof of concept, we establish an initial implementation of our security module using JAVA programming language

Dos nuevas especies de truchas atlánticas (Actinopterygii, Salmonidae) de Marruecos

[EN] Four trout species of the genus Salmo Linnaeus, 1758 have been traditionally recognized in Morocco: S. macrostigma Duméril, 1858; S. pallaryi Pellegrin, 1924; S. pellegrini Werner, 1931 and S. akairos Delling & Doadrio, 2005. Two of these species are mainly distributed in Mediterranean (S. macrostigma) and Atlantic (S. pellegrini) river basins while the other two species are restricted to isolated lakes in the Atlas Mountains, one of them to Ifni Lake (S. akairos) and the other, probably extinct, to Sidi Ali Lake (S. pallaryi). Preliminary phylogenetic and regional studies based on molecular data have found high structuration of the populations of this genus in Morocco. These studies focused on allozymes, microsatellites and mitochondrial markers found genetic differences in populations from Isli Lake (Atlas Mountains) and the Draa Basin in southern Morocco. In this work we provide different morphological and genetic traits to distinguish these populations from Isli Lake and Draa Basin as two different species.[ES] Cuatro especies del género Salmo Linnaeus, 1758 se han reconocido tradicionalmente en Marruecos: S. macrostigma Duméril, 1858; S. pallaryi Pellegrin, 1924; S. pellegrini Werner, 1931 y S. akairos Delling y Doadrio, 2005. Dos de estas especies se distribuyen por las cuencas mediterráneas (S. macrostigma) y atlánticas (S. pellegrini), mientras que las otras dos están restringidas a lagos aislados en las montañas del Atlas, una de ellas al Lago Ifni (S. akairos) y la otra, probablemente extinta, al Lago de Sidi Alí (S. pallaryi). Estudios filogenéticos preliminares y estudios regionales basados en alozimas, microsatélites y marcadores mitocondriales hallaron una alta estructuración de las poblaciones de este género en Marruecos, con diferencias genéticas significativas en las poblaciones del lago de Isli (Montañas del Atlas) y de la cuenca del Draa en el sur de Marruecos. En el presente trabajo nosotros proveemos evidencia morfológica y genética para distinguir estas poblaciones del lago de Isli y de la cuenca del Draa como dos especies diferentes.Peer Reviewe

A novel scalable representative-based forecasting approach of service quality

© 2020, Springer-Verlag GmbH Austria, part of Springer Nature. Several approaches to forecast the service quality based on its quality of service (QoS) properties are reported in the literature. However, their main disadvantage resides in their limited scalability. In fact, they elaborate a forecasting model for each quality attribute per service, which cannot scale well for large or even medium size datasets of services. Accordingly, we propose a novel scalable representative-based forecasting approach of QoS. The QoS is modeled as a multivariate time series in which the values of service attributes are evaluated at each time instant and forecasted based on three stages. First, a data aggregation function is applied to the multivariate time series data. Then, principal component analysis (PCA) is applied to the quality attributes to determine the most relevant ones. The reduced data is then clustered, so that, a representative for each cluster is computed. Finally, a forecasting model is built for each cluster representative for the sake of deriving other services’ forecasting models. A set of extensive experiments are carried out to assess the efficiency and accuracy of the proposed approach on a dataset of real services. The experimental results show that the proposed approach is up to 75% more efficient than direct forecasting approaches using time measurements while increasing the number of forecasted services and that the elaborated forecasting models enjoy insignificant forecasting errors

Revisión taxonómica del género Luciobarbus Heckel, 1843 (Actinopterygii, Cyprinidae) del noroeste de Marruecos con la descripción de tres nuevas especies

[EN] The genus Luciobarbus in Morocco presents high diversification, in contrast to the generally impoverished freshwater fish fauna from North Africa. Within Morocco the northern area is one of the least studied territories, due to both its historical background and the limited accessibility of many regions. Previous phylogenetic studies identified Luciobarbus populations that are morphologically and genetically differentiated, to the same extent as others already recognized as separate species. The aim of this work is to describe these populations as distinct species, based on morphological, meristic, and genetic traits.[ES] En Marruecos el género Luciobarbus está altamente diversificado, en comparación con la empobrecida fauna de peces de agua dulce del norte de África. Dentro de Marruecos la región norte es una de las áreas menos estudiadas, por motivos históricos y también por la poca accesibilidad en algunas de sus regiones. Los estudios filogenéticos previos para esta área han señalado la existencia de poblaciones pertenecientes al género Luciobarbus tan diferenciadas morfológica y genéticamente como otras que ya habían sido reconocidas como diferentes especies. En este trabajo describimos estas poblaciones como diferentes taxa, en base a caracteres morfológicos, merísticos y genéticos.Peer Reviewe

Taxonomía de las especies reófilas del género Luciobarbus Heckel, 1842 (Actinopterygii, Cyprinidae) de Marruecos con la descripción de dos nuevas especies

[EN] The genus Luciobarbus Heckel, 1843 is characterized by medium to large fish species occurring in large rivers and downstream zones with slow-moving waters. Remarkably also rheophilic Luciobarbus occur in Morocco, which are of small size and exhibit distinct morphological traits as well as different habitat requirements. These rheophilic species have traditionally been assigned to Luciobarbus nasus (Günther, 1874) and L. magniatlantis (Pellegrin, 1919), although some authors consider L. magniatlantis as a junior synonym of L. nasus. This lack of consensus on the taxonomy of rheophilic barbs is constrained by limited population studies that do not encompass their entire distribution range. Using molecular, morphometric, and osteological data we studied populations of rheophilic barbs of three drainage basins in which they are currently present: Tensift, Moulouya and Oum er Rbia. Our results clearly identified the rheophilic barbs of each basin as different species. The species Luciobarbus magniatlantis is a well-recognized species endemic to Tensift Basin. In contrast, the investigated populations from the Moulouya and Oum er Rbia basins could not be assigned to any previously described species. Consequently, we describe two new Luciobarbus species in the Moulouya and Oum er Rbia basins.[ES] El género Luciobarbus Heckel, 1843 se caracteriza por presentar especies de medio y gran tamaño que viven en las zonas bajas de grandes ríos con aguas lentas. Singularmente, en Marruecos también existen especies reófilas del género Luciobarbus de pequeño tamaño y que presentan diferentes caracteres morfológicos y distintos requerimientos de hábitat. Estas especies reófilas han sido tradicionalmente asignadas a Luciobarbus nasus (Günther, 1874) y L. magniatlantis (Pellegrin, 1919) aunque algunos autores consideran a L. magniatlantis como un sinónimo de L. nasus. Esta falta de consenso en la taxonomía de los barbos reófilos está limitada por los escasos estudios poblacionales realizados que no abarcan la totalidad del área de distribución de estos barbos. Nosotros, usando datos moleculares, morfométricos y osteológicos, estudiamos las poblaciones de los barbos reófilos de tres cuencas hidrográficas, en las cuales están actualmente presentes: Tensift, Moulouya y Oum er Rbia. Nuestros resultados claramente identifican a los barbos reófilos de cada una de estas cuencas como diferentes especies. La especie L. magniatlantis es una especie bien definida y endémica de la cuenca del Tensift. En contraste, las poblaciones analizadas de las cuencas del Moulouya y Oum er Rbia no pudieron ser asignadas a ninguna especie previamente descrita. Consecuentemente, nosotros describimos dos nuevas especies de Luciobarbus en las cuencas del Moulouya y del Oum er Rbia.Peer Reviewe

Pathotypic diversity of Rhynchosporium secalis (Oudem) in Tunisia

Scald, caused by Rhynchosporium secalis (Oudem), is an important disease of barley in Tunisia particularly in northern, northwestern and central parts of the country where the climate is usually cold and wet during most of the barley growing season. Pathogenic variability of the barley scald pathogen in Tunisia was determined by testing the pathogenicity of 100 isolates from 5 different regions on 19 host differentials. Pathotypic diversity was high, with 93 R. secalis pathotypes identified on two differential sets (one comprising 9 and the other 10 barley lines) containing known resistance genes. A few pathotypes comprised 2% of the isolates; however, the majorities were represented by a single isolate. None of the differential lines was resistant to all isolates. The differential cultivar “Astrix” was the least compatible with the scald pathotypes followed by the differential cultivars “Atlas” and “Abyssinia”. Compatibility of the pathotypes on “Rihane” (69%) was close to that on “Osiris” (73%) and “La Mesita” (61%). None of the pathotypes was found in all the five regions of Tunisia surveyed. Some pathotypes were specific to a single region while others were found in several regions. The incidence of pathotypes varied considerably among regions, with region 3 (northwestern Tunisia) comprising the largest number of pathotypes. Virulent pathotypes were recovered in all regions but more pathotypic variability (44%) was observed in the semi-arid region 3. Differential cultivars allowed classification of R. secalis in four virulence groups. Canonical discriminant analysis showed no apparent association between virulence and geographical origin of the populations. Pathogenic variability in R. secalis in Tunisia was found not to be associated with geographical region, hence, the necessity for deployment of different resistance sources in major barley growing areas.Key words: Rhynchosporium secalis, barley, virulence groups, pathotypic variation