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In this letter, a general approach is presented to synthesize the coupling matrix that matches to arbitrary frequency-invariant complex source and load. The approach converts the objective scattering matrix and reference impedances into an admittance matrix of multicoupled circuit based on the definition of power wave. The proposed method was verified by numerical and also simulated tests carried...
In order to simulate the wireless channel models, Gaussian white noise is needed to be generated. This paper proposes a parallel operation method based on cellular automation theory to obtain large pseudorandom numbers in high frequency. Furthermore, according to the Box Muller algorithm, the uniform distribution numbers are transformed to desired Gaussian white noise through curve matching function...
The multivariate public key cryptosystems (MPKCs) have a bigger scale of private key and public key than conventional number theoretic based public key cryptosystems like RSA, DH, and ECDH. In this paper, we present a method to construct the linear transformations in a private key of MPKC by generalized central symmetric matrices over a finite field of odd characteristic. This method reduces 3/8 of...
TTM (tame transformation method) is a type of multivariate public key cryptosystem. In 2007, the inventor of TTM proposed two new instances of TTM to resist the existing attacks, in particular, the Nie et al attack. The two instances are claimed to achieve a security of 2109 against Nie et al attack. Through computation, we found that the instance II satisfied First Order Linearization Equations....
TTM is a type of multivariate public key cryptosystem. In 2007, the inventor of TTM proposed two new instances of TTM to resist the existing attack, in particular, the Nie et al attack. The two instances are claimed to achieve a security of 2109 against Nie et al attack. In this paper, we show that the instance I is still insecure, and in fact, it do not achieve a better design in the sense that we...
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