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The paper presents a method for the determination of the bias point of nonlinear electrical circuits, based on the modified nodal method, by utilization of symbolic computation and genetic algorithms. For the solving of the circuit it is written the equations system corresponding to the modified nodal method in a partial symbolic form. On the basis of the partial symbolic form of these equations an...
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...
Elliptic curve cryptosystems have gained increase attention and have become an intense area of research, mainly because of their shorter key length when compared to other public key cryptosystems such as RSA. Shorter key length brings advantages such as reduced computation effort, power consumption and storage requirements, making it possible to increase the available security for portable devices,...
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,...
In the recent years, watermarking algorithms were designed based on different dynamical chaotic systems. In this paper we propose some ideas to improve the performances of this kind of techniques using the PWLCM, the DCT and luminance transformation of the image in order to hide the watermark information in an invisible and robust way.
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