European Journal of Scientific Research

Publisher: EuroJournals

Current impact factor: 0.74

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ISSN 1450-202X

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EuroJournals

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Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Cet article présente une nouvelle approche d’estimation du risque inondation au Maroc. La démarche suivie considère le risque comme un jeu de vulnérabilité et de facteurs de compensation caractéristiques des enjeux. Elle permet d’évaluer la vulnérabilité aux inondations selon plusieurs formes. Ce travail porte sur la seule forme « vulnérabilité intrinsèque ». Il s’intéresse principalement à l’enjeu « réseau routier » et a été testé dans la province de Larache (Maroc) qui a connu d’importantes inondations aux cours des dernières années. Le calcul de la vulnérabilité intrinsèque a nécessité la combinaison en une formule de cinq indicateurs : l’indice de surface, la largeur de la route, le trafic de la route, la pente de la route et la nature de la route. Le résultat obtenu est une cartographie fine du risque inondation de la Province de Larache. Il permet de mesurer le degré de vulnérabilité de chaque route. Ce résultat est en parfait accord avec les archives du ministère de l’équipement qui enregistrent les interruptions du trafic routier suite aux précipitations des trois dernières années. Keywords: Vulnérabilité, inondation, enjeux, réseau routier, Larache, cartographie
    No preview · Article · Mar 2015 · European Journal of Scientific Research
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    ABSTRACT: Background: A new signature scheme of ElGamal cryptosystem is proposed which uses over the abelian group of units U(n) where n is one of the following forms pt, or 2pt where p is an odd large prime and t is a positive integer. The security of this systems relies on the difficulty of computing discrete logarithms over U(n). This study is mainly about one of the most important applications of number theory which is about signing messages in the ElGamal cryptosystem over the abelian group of units U(n) where n is one of the following forms pt, or 2pt where p is an odd large prime and t is a positive integer. In a previous published article that is listed in the references, I suggested an interesting way to deal with the ElGamal Cryptosystem using that abelian group of Units U(n)={x: x is a positive integer such that x<n and gcd(n,x)=1} in the setting of the discrete logarithm problem. Objective: In this paper, I modify and apply that idea in signing messages in the ElGamal Cryptosystem. Since I show in this paper that we can use the abelian group U(n) where n is one of the following forms pt, or 2pt in signing messages. Also, I hope to show this new study maintains equivalent (or better) security with the original ElGamal cryptosystem that works over the finite cyclic group of the finite field. Results: This idea gives another way to sign messages that are being encrypted using the ElGamal cryptosystem, and that would help the receiver to make sure that the received message(s) came from the right sender. Conclusion: The ElGamal signature scheme over this type of abelian group of units is much more securer than before.
    No preview · Article · Dec 2014 · European Journal of Scientific Research