Wyniki wyszukiwania - BazTech

1

A novel cryptosystem based on chaotic signals for data encryption applications and CDMA communication system

Alshammari Ahmed Saud

Przegląd Elektrotechniczny

|

2022

|

R. 98, nr 2

10--13

EN

In this paper, we study the Lorenz chaotic system as a cryptosystem stream cipher. The system employs a stream cipher, in which the encryption key changes in a chaotic manner over time. For added security, one of the Lorenz generator's parameters are controlled by step function subsystem. The cryptosystem's bit stream passed the statistical randomness test. As a result, a cryptosystem's design can withstand many sorts of attacks, such as brute force. The system's key size will be greater than 256, allowing for a total of 2256 key spaces. As a result, the large key space will give strong plaintext security against a brute force attack.

PL

W tym artykule badamy chaotyczny system Lorenza jako szyfr strumieniowy kryptosystemu. System wykorzystuje szyfr strumieniowy, w którym klucz szyfrowania zmienia się w czasie w sposób chaotyczny. Dla zwiększenia bezpieczeństwa, jeden z parametrów generatora Lorenza jest kontrolowany przez podsystem funkcji krokowej. Strumień bitów kryptosystemu przeszedł test losowości statystycznej. W rezultacie projekt kryptosystemu może wytrzymać wiele rodzajów ataków, takich jak brutalna siła. Rozmiar klucza systemowego będzie większy niż 256, co pozwoli na łącznie 2256 miejsc na klucze. W rezultacie duża przestrzeń na klucze zapewni silne zabezpieczenie tekstu jawnego przed atakiem brute force.

2

A stream cipher generator based on a combination of two non-linear systems for secure signal transmissions

Alshammari Ahmed Saud

Przegląd Elektrotechniczny

|

2020

|

R. 96, nr 10

51--54

EN

A new cryptosystem approach based on two non-linear systems combined to satisfy a high degree of signal transmission security. These systems are Lorenz system and Rössler system. Each chaotic system has a completely different output bit stream. The system uses a stream cipher, in which the encryption key varies continuously. Therefore, a design of a secure communication system that is robust to different types of attacks such brute force attack is very important. One of the main properties of this system is the ability to retrieve the data transmitted through a noisy environment. The proposed system is a novel stream cipher which is based on combining two non-linear systems that are used in digital communication system. The key size of the system will exceed 576, which provide 2576 key space. Hence, this huge key space will provide a high security for plaintext against a brute force attack.

PL

Przedstawiono nowy szystem szyfrowania danych bazujący na kombinacji dwóch nieliniowych. Te dwa systemy to system Lorenza i system Rosslera. System umożliwia odzyskanie danych przy transmisji w zaszumionym środowisku.

3

Pinning synchronization of the drive and response dynamical networks with lag

Wen B., Zhao M., Meng F.

Archives of Control Sciences

|

2014

|

Vol. 24, no. 3

257--270

EN

This paper investigates the pinning synchronization of two general complex dynamical networks with lag. The coupling configuration matrices in the two networks are not need to be symmetric or irreducible. Several convenient and useful criteria for lag synchronization are obtained based on the lemma of Schur complement and the Lyapunov stability theory. Especially, the minimum number of controllers in pinning control can be easily obtained. At last, numerical simulations are provided to verify the effectiveness of the criteria.

4

Analiza układu Lorenza niecałkowitego rzędu

Busłowicz M.

Pomiary Automatyka Robotyka

|

2012

|

R. 16, nr 2

303-306

PL

Uogólniono klasyczne równania stanu układu Lorenza na przypadek układu niecałkowitego rzędu o tym samym niecałkowitym rzędzie pochodnej dla wszystkich zmiennych stanu. Pokazano, że układ Lorenza niecałkowitego rzędu ma niestabilne wszystkie punkty równowagi dla α > 0,9941. Na postawie badań symulacyjnych stwierdzono, że układ Lorenza niecałkowitego rzędu α =1,1 jest układem chaotycznym.

EN

Generalization of the state equations of the classical Lorenz chaotic system to case of the system with the same fractional order of all state variables is given. It has been proved that the fractional Lorenz system has unstable all equilibrium points for α > 0,9941 . On the basis of simulations it has been shown that the fractional Lorenz system for α =1,1 is a chaotic system with the attractor similar to the classical Lorenz Attractor.

5

The linear generalized chaos synchronization and predictability

Poria S.

International Journal of Applied Mechanics and Engineering

|

2007

|

Vol. 12, no 3

879-885

EN

In this paper, we study generalized chaos synchronization of two Lorenz dynamical systems via linear transformation. This synchronization method is based on the stability criterion of linear systems. This method does not require calculation of the Lyapunov exponents. We obtain the functional relationship between the states of the driving system and response system. Finally, we show the simulation results.

6

The Rayleigh-Benard Convection Analysis by the Lorenz Dynamical System

Jopek H., Strek T.

Vibrations in Physical Systems

|

2004

|

Vol. 21

183--186

7

About the properties of attraction sets of two models of physics of the atmosphere

Brojewski R., Jasiński J.

Journal of Technical Physics

|

2003

|

Vol. 44, no 3

311-328

EN

Dynamical properties of two simple models derived from the equations of physics of the atmosphere are investigated in this paper. Attention was paid to the structure of attraction sets (especially to their borders) of the attractors existing in the models. The influence of precision of the integrating procedures' on some of the attractors identification was investigated. The mechanism of destroying a strange attractor (by the nonlinear resonance) in a Lorenz system with thermal forcing was found.