Institute Seguridad Of La Informacion

Madrid, Spain

Institute Seguridad Of La Informacion

Madrid, Spain

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Pena M.C.,Institute Seguridad Of La Informacion | Diaz R.D.,University of Alcalá | Encinas L.H.,Institute Seguridad Of La Informacion | Masque J.M.,Institute Seguridad Of La Informacion
Advances in Intelligent Systems and Computing | Year: 2014

The threat quantum computing poses to traditional cryptosystems (such as RSA, elliptic-curve cryptosystems) has brought about the appearance of new systems resistant to it: among them, multivariate quadratic public-key ones. The security of the latter kind of cryptosystems is related to the isomorphism of polynomials (IP) problem. In this work, we study some aspects of the equivalence relation the IP problem induces over the set of quadratic polynomial maps and the determination of its equivalence classes. We contribute two results. First, we prove that when determining these classes, it suffices to consider the affine transformation on the left of the central vector of polynomials to be linear. Second, for a particular case, we determine an explicit system of invariants from which systems of equations whose solutions are the elements of an equivalence class can be derived. © Springer International Publishing Switzerland 2014.


Peinado A.,University of Malaga | Munilla J.,University of Malaga | Fuster-Sabater A.,Institute Seguridad Of La Informacion
Advances in Intelligent Systems and Computing | Year: 2014

Many proposals of pseudorandom sequence generators and stream ciphers employ linear feedback shift registers with dynamic feedback (DLFSR) as the main module to increase the period and linear span of the involved msequences. In this paper, we present a theoretical model that allows the design of longer sequences with higher linear span than in previous DLFSR schemes. The model determines the constant relationship between period and linear span for these structures. These more complex sequences here obtained improve the proposals based on LFSR with dynamic feedback found in the literature. © Springer International Publishing Switzerland 2014.


Duran Diaz R.,University of Alcalá | Hernandez Encinas L.,Institute Seguridad Of La Informacion | Munoz Masque J.,Institute Seguridad Of La Informacion
Advances in Intelligent Systems and Computing | Year: 2013

In this paper, we analyze a new proposal for a knapsack-type cryptosystem, recently published by Wang and Hu ([1]), along with two cryptanalyses of it, carried out by Youssef ([2]) and Lee ([3]). The cryptosystem proves to be safe only if the keys have very large sizes, but this severely impacts the use of the system from a practical point of view. © 2013 Springer-Verlag Berlin Heidelberg.


Duran Diaz R.,University of Alcalá | Hernandez Encinas L.,Institute Seguridad Of La Informacion | Munoz Masque J.,Institute Seguridad Of La Informacion
Physica D: Nonlinear Phenomena | Year: 2013

The fractal set attached to the iteration of a "generic" homogeneous quadratic map from the plane to itself is studied and depicted, by using a two-parametric family of normal forms obtained from the theory of invariants of symmetric bilinear maps FR×R→R under the full linear group of the plane. While invariant theory classifies maps FC×C→C on the complex plane, we confine ourselves to consider maps on the real plane, in order to include the results obtained from the theory of two-dimensional discrete dynamical systems. A discrete number of "topological types" for such fractals is conjectured to exist. © 2012 Elsevier B.V. All rights reserved.


Matatagui D.,Institute Seguridad Of La Informacion | Moynet D.,University of Bordeaux 1 | Fernandez M.J.,Institute Seguridad Of La Informacion | Fontecha J.,Institute Seguridad Of La Informacion | And 7 more authors.
Sensors and Actuators, B: Chemical | Year: 2013

An immunosensor based on a Love-wave device and a PDMS microfluidic chip has been developed to detect potentially pathogenic microorganisms in real time. In order to characterize and test the immunosensor, the M13 bacteriophage has been chosen as a model of microorganism. The M13 was detected with the mouse monoclonal antibody, anti-M13 (AM13), which has been immobilized on the Love wave-device. The immunoassay has been carried out in a dynamic mode (continuous flow) through microchannels with the goal of obtaining a short response time in detecting a small volume of a sample of M13 bacteriophage. The concentrations of the bacteriophage have been varied between 5 × 108 pfu ml -1 and 2 × 1010 pfu ml-1, a range for which a fast detection and a favorable discrimination among concentrations have been achieved. The AM13 has been also used as a secondary antibody in order to measure lower concentrations such as 5 × 107 pfu ml -1. The Double-Layer Agar technique has been used to quantify, as plaques-forming unit (pfu), the number of M13 bacteriophage in the initial sample as well as those linked to the sensor surface during the detection. Finally, the number of bacteriophage was estimated by calculating the mass sensitivity. The values obtained in both procedures have been very similar. © 2013 Elsevier B.V.


Matatagui D.,Institute Seguridad Of La Informacion | Fontecha J.,Institute Seguridad Of La Informacion | Fernandez M.J.,Institute Seguridad Of La Informacion | Santos J.P.,Institute Seguridad Of La Informacion | And 3 more authors.
Proceedings of the 2013 Spanish Conference on Electron Devices, CDE 2013 | Year: 2013

A Love-wave device combined with a microfluidic chip of PDMS has been developed to detect biological warfare agents (BWA) in liquid media. It has been tested with the realization of two immunoassays: in the first one the bacteriophage M13 has been detected through the mouse monoclonal antibody, anti-M13 (AM13) and in the second one the detection has been carried out by means of the immunoreaction of the rabbit immunoglobulin (Rabbit IgG) with the goat anti-rabbit polyclonal antibody (GAR). The detections have been performed in a dynamic mode (continuous flow-through) in order to obtain a short response time. Different concentrations have been detected with a fast response and a good discrimination among them. © 2013 IEEE.

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