J. A. López-Ramos

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In this paper we use the Diffie–Hellman key exchange protocol to introduce a decentralized key agreement protocol based on elliptic curves. We do not use any public key infrastructure, which makes it suitable for light devices with low computational and storage capabilities. Thus mobile devices can directly authorize other mobile devices to exchange keys in(More)
For nonsingular n× n (n ≥ 6) pentadiagonal matrices P having nonzero entries on its second subdiagonal, we propose a procedure for computing both the determinant detP in O(n) times, and accurate information for obtaining the inverse P−1 in O(n) times. In the general nonsingular case, n ≥ 5, a suitable decomposition of P, as a product of two nonsingular(More)
In 1966 [1], Auslander introduced a class of finitely generated modules having a certain complete resolution by projective modules. Then using these modules, he defined the G-dimension (G ostensibly for Gorenstein) of finitely generated modules. It seems appropriate then to call the modules of G-dimension 0 the Gorenstein projective modules. In [4],(More)
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