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In this paper we present a solution for the classification of different patterns from seismic signals generated by different human activities for which an automatic recognition is required. Some a priori known signals were available, which gave us the possibility to represent them in feature space in order to capture their global characteristics. The classification of signals is based on computing...
Ensuring good confusion and diffusion in symmetrical cryptosystems substitution is very important. Beginning with the attacks against DES, construction of good S-boxes gained more interest due to the nonlinearity necessity. During the past years, the features of the dynamical chaotic systems were exploited to design cryptographic techniques, in order to give an alternative to classic methods. In this...
Over the past few years, new cryptographic algorithms, based on chaotic maps, have been proposed in order to give an alternative to classical methods. In this paper we propose some ideas to improve the performances of this kind of techniques based on the Lyapunov exponent for setting the parameter interval and on feedback mechanism which uses the most sensitive part of the value of the chaotic map,...
This paper presents a cryptographic system based on cellular automata (CA) theory. The entire encryption system is implemented in reconfigurable hardware (FPGA) and it is used to protect data sent over the internet. It is shown how a series of simple elements called “cells” interact between each other using certain rules and topologies to form a larger system further used to encrypt/decrypt data....
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