12 research outputs found

    On a new fast public key cryptosystem

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    This paper presents a new fast public key cryptosystem namely : a key exchange algorithm, a public key encryption algorithm and a digital signature algorithm, based on the difficulty to invert the following function : F(x)=(a×x)Mod(2p)Div(2q)F(x) =(a\times x)Mod(2^p)Div(2^q) .\\* Mod is modulo operation , Div is integer division operation , a , p and q are integers where (p>q)( p > q ) .\\* In this paper we also evaluate the hardness of this problem by reducing it to SAT

    Multidimentional ModDiv public key exchange protocol

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    This paper presents Multidimentional ModDiv public key exchange protocol which security is based on the hardness of an LWR problem instance consisting on finding a secret vector X\textbf{X} in Zqn\mathbb{Z}_{q}^{n} knowing vectors A\textbf{A} and B\textbf{B} respectively in Zpm\mathbb{Z}_{p}^{m} and Zpqmn\mathbb{Z}_{p-q}^{m-n}, where elements of vector B\textbf{B} are defined as follows : B(i) B(i) = (j=1j=nA(i+nj)×X(j)\sum_{j=1}^{j=n} A(i+n-j) \times X(j)) Mod(P)Div(Q) Mod(P)Div(Q). Mod is integer modulo, Div is integer division, P and Q are known positive integers which sizes in bits are respectively p and q which satisfy p>2×q p > 2 \times q . m and n satisfy m>2×n m >2 \times n

    Symetric encryption algorithms based on the mathematical structure underlying the three body problem

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    The three body problem is the founding problem of deterministic chaos theory. In this article is proposed a new stream cipher algorithm based on a mathematical structure similar to that underlying the 3 body poblem. Is also proposed to use said structure for the design of new bloc ciphers and hash functions algorithms

    On a new fast public key cryptosystem

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    This paper presents a new fast public key cryptosystem namely : a key exchange algorithm, a public key encryption algorithm and a digital signature algorithm, based on the difficulty to invert the following function : F(x) = (a * x)Mod(2 power p)Div(2 power q) . Mod is modulo operation , Div is integer division operation , a , p and q are integers where (p > q) . In this paper we also evaluate the hardness of this problem by reducing it to SAT

    Patterns of virulence diversity in Puccinia recondita on wheat in Morocco in 2005 and 2006

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    A total of 105 isolates of Puccinia recondita from durum wheat and common wheat were collected from the four main agro-ecological areas of Morocco, Abda-Doukkala, Chaouia-Tadla, Gharb-Saïss and Tangérois. The isolates were tested for virulence phenotypes on seedling plants of 21 near-isogenic lines of Thatcher wheat. Eightynine virulence phenotypes were identified and the resistance genes Lr2a, Lr2b, Lr2c, Lr3bg, Lr3ka, Lr9, Lr21, and Lr24 were found to confer a good resistance on isolates of all four collections. In the set of differentials used in this study, no significant difference was found between virulence frequencies of isolates from durum and from common wheat. Principal coordinates analysis and the Kosman distance between virulence phenotypes showed that the collections from Gharb-Saïss and Tangérois were closely related to each other, while Abda-Doukkala was closely related to Chaouia-Tadla

    On a new properties of number sequences ,a randomness test and a new RC4\u27s key scheduling algorithm.

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    In this paper, we introduce the concept of the derivative of sequence of numbers and define new statistical indices by which we discoverd new properties of randomly generated number sequences. We also build a test for pseudo random generators based on these properties and use it to confirm the weakness of RC4 key scheduling algorithm that has been reported in the litterature. In this rescpect we publish a new RC4\u27s key scheduling algorithm that don\u27t have this weakness

    La morphologie du corps humain entre pédagogie artistique et science du corps

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    Le corps humain a depuis toujours fasciné. Science, philosophie, art... les disciplines majeures ont fait du corps humain leur objet de recherche. Alors, qu'en est-il de la représentation du corps ? Peut-on dresser un historique, au sein d'une institution comme l'Ecole nationale supérieure des beaux-arts de Paris ? Y-a-t-il une pédagogie liée à l'étude du corps ? Comment des siècles d'anatomie ont donné naissance à la morphologie ? C'est à une aventure d'une incroyable richesse que vous convie l'auteur de cette rechercheST DENIS-BU PARIS8 (930662101) / SudocSudocFranceF

    Patterns of virulence diversity in Puccinia recondita on wheat in Morocco in 2005 and 2006

    No full text
    A total of 105 isolates of Puccinia recondita from durum wheat and common wheat were collected from the four main agro-ecological areas of Morocco, Abda-Doukkala, Chaouia-Tadla, Gharb-Saïss and Tangérois. The isolates were tested for virulence phenotypes on seedling plants of 21 near-isogenic lines of Thatcher wheat. Eightynine virulence phenotypes were identified and the resistance genes Lr2a, Lr2b, Lr2c, Lr3bg, Lr3ka, Lr9, Lr21, and Lr24 were found to confer a good resistance on isolates of all four collections. In the set of differentials used in this study, no significant difference was found between virulence frequencies of isolates from durum and from common wheat. Principal coordinates analysis and the Kosman distance between virulence phenotypes showed that the collections from Gharb-Saïss and Tangérois were closely related to each other, while Abda-Doukkala was closely related to Chaouia-Tadla
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