scholarly journals MODELS OF RANDOM SYSTEMS WITH CONTROLLED SYMMETRY IN STREAM ENCRYPTION

2019 ◽  
Vol 2019 (11) ◽  
pp. 46-54
Author(s):  
Денис Бутусов ◽  
Sergey Butusov ◽  
Александра Тутуева ◽  
Aleksandra Tutueva ◽  
Артур Каримов ◽  
...  
Keyword(s):  
Communication Systems ◽  
Random Systems ◽  
Statistical Testing ◽  
Linear Feedback ◽  
Random Numbers ◽  
Small Length ◽  
Random System ◽  
Symmetry Factor ◽  
Short Period ◽  
Information Safety

Information safety plays an important role in modern technologies. A stream encryption is one of the common means for information safety support. The sequences with pseudo-random characteristics are often required in the algorithms of stream enciphering. Random systems are recently used as a source of pseudo-random numbers with desired statistical properties. A small length of a sequence period is one of the known problems of the generators of pseudo-random numbers based on chaos realized with a small length of a digit grid. The disturbance of a path or a parameter of random system nonlinearity is one of possible solutions of a short period problem. In this paper there is considered a new approach to the increase of a period length through the change of a symmetry factor in the random model of a memristive circuit. The approach offered is based on switching two values of the symmetry factor in accordance with the output of a shear register with the linear feedback. To confirm the effectiveness of the disturbance circuit described the lengths of a period for the disturbed and original model of the memristive system are estimated. The properties of the output sequences caused by a generator on the basis of the model with controlled symmetry are confirmed by the results of the correlation analysis and NIST statistical testing. The results obtained can be used in cryptographic applications and also at the designing of safe communication systems.

Design and Implementation of an Efficient Parallel LFSR Architecture for Wireless Communication Systems

2019 ◽  
Vol 14 ◽  
Author(s):  
A. Suresh Babu ◽  
B. Anand
Keyword(s):  
Wireless Communication ◽  
Power Consumption ◽  
Low Power ◽  
Communication Systems ◽  
High Speed ◽  
Design Tool ◽  
Shift Register ◽  
Linear Feedback ◽  
Wireless Communication Systems ◽  
Coverage Area

: A Linear Feedback Shift Register (LFSR) considers a linear function typically an XOR operation of the previous state as an input to the current state. This paper describes in detail the recent Wireless Communication Systems (WCS) and techniques related to LFSR. Cryptographic methods and reconfigurable computing are two different applications used in the proposed shift register with improved speed and decreased power consumption. Comparing with the existing individual applications, the proposed shift register obtained >15 to <=45% of decreased power consumption with 30% of reduced coverage area. Hence this proposed low power high speed LFSR design suits for various low power high speed applications, for example wireless communication. The entire design architecture is simulated and verified in VHDL language. To synthesis a standard cell library of 0.7um CMOS is used. A custom design tool has been developed for measuring the power. From the results, it is obtained that the cryptographic efficiency is improved regarding time and complexity comparing with the existing algorithms. Hence, the proposed LFSR architecture can be used for any wireless applications due to parallel processing, multiple access and cryptographic methods.

scholarly journals Introduction to Stochastic Computing using a Remote Lab with Reconfigurable Logic

2016 ◽  
Vol 12 (04) ◽  
pp. 23
Author(s):  
Jorge Lobo
Keyword(s):  
Random Number ◽  
Random Number Generation ◽  
Linear Feedback ◽  
Short Paper ◽  
Integration Time ◽  
Random Numbers ◽  
Reconfigurable Logic ◽  
Linear Feedback Shift Registers ◽  
Stochastic Computing ◽  
Remote Lab

This short paper introduces the basic concepts of Stochastic Computing (SC), and presents additions to a remote lab with reconfigurable logic to allow testing SC circuits. Recently, SC has been revisited and evaluated as a possible way of performing approximate probabilistic computations for artificial perception systems. New modules allow the generation of pseudo-random numbers, given a seed key and using linear feedback shift registers, but also having true random number generation using ring oscillators and embedded PLLs. Stochastic computing allows a tradeoff between resource usage and precision, allowing very simple circuits to perform computations, at the expense of a longer integration time to have reasonable results. We provide the basic stochastic computing modules, so that any user can use them to build a stochastic computing circuit and go beyond software simulations, providing a remote hardware device to test real circuits at high clock speeds.

scholarly journals Sustainability and Large-Scale Events: The Case of the Extraordinary Jubilee of Mercy and the Application of Sustainable Development Goals

2020 ◽  
Vol 13 (3) ◽  
pp. 71
Author(s):  
Chiara Di Gerio ◽  
Gloria Fiorani ◽  
Giuseppe Paciullo
Keyword(s):  
Sustainable Development ◽  
Communication Systems ◽  
Large Scale ◽  
Best Practice ◽  
Sustainable Development Goals ◽  
Sustainable Growth ◽  
Dynamic Complexity ◽  
Italian Case ◽  
Short Period ◽  
Development Goals

Large-scale events, which are characterised by a dynamic complexity involving different national public administrations and institutional levels, require special attention in order to select adequate event management systems. Consequently, the analysis of a best practice event may be useful to identify the main variables, in terms of sustainable strategic planning, execution and control &ndash;required to achieve the greatest level of efficiency with regard to cost optimisation and quality of service delivery&ndash; along with exhorting the public sector to seek a structural renovation that makes better use of its available resources and fosters global sustainable growth. From this perspective, one such relevant experience has been the Italian case of the 2016 Extraordinary Jubilee of Mercy, coordinated by the Prefect of Rome. Indeed, the latter decided to adopt actions consistent with sustainability standards due to an inter-institutional network design and the engagement of institutions at different levels. Within a very short period, the Prefect of Rome achieved three main results: the coordination of the activities of the working groups, the integration of internal and external surveillance and communication systems, and collaboration with higher education institutions to acquire and disseminate knowledge. Accordingly, the aim of this paper is to describe and analyse this best practice event organised and managed by the Italian public administration with reference to the achievement of the UN&rsquo;s Sustainable Development Goals (SDGs). To systemise and combine the outcomes of these processes, as well as to evaluate whether they were consistent with sustainable development, the systems thinking technique was used. This paper explores the concept of sustainable development and focuses on its traditional social, environmental and economic pillars within the context of planned events such as the 2016 Extraordinary Jubilee of Mercy.

scholarly journals Design and Implementation of a Statistical Testing Framework for a Lightweight Stream Cipher

2020 ◽  
Vol 10 (1) ◽  
pp. 5132-5141
Author(s):  
A. Alamer ◽  
B. Soh
Keyword(s):  
Stream Cipher ◽  
Network Models ◽  
Window Size ◽  
Binary Sequences ◽  
Statistical Testing ◽  
Linear Feedback ◽  
Maximal Degree ◽  
Neural Network Models ◽  
Computing Power ◽  
Testing Framework

The Shrinking Generator (SG) is a popular synchronous, lightweight stream cipher that uses minimal computing power. However, its strengths and weaknesses have not been studied in detail. This paper proposes a statistical testing framework to assess attacks on the SG. The framework consists of a d-monomial test that is adapted to SG by applying the algebraic normal form (ANF) representation of Boolean functions, a test that uses the maximal degree monomial test to determine whether the ANF follows the proper mixing of bit values, and a proposed unique window size (UWS) scheme to test the randomness properties of the keystream. The proposed framework shows significant weaknesses in the SG output in terms of dependence between the controlling linear-feedback shift register (LFSR) and non-linearity of the resulting keystream. The maximal degree monomial test provides a better understanding of the optimal points of SG, demonstrating when it is at its best and worst according to the first couple of results. This paper uses UWS to illustrate the effect of the LFSR choice on possibly distinguishing attacks on the SG. The results confirm that the proposed UWS scheme is a viable measure of the cryptographic strength of a stream cipher. Due to the importance of predictability and effective tools, we used neural network models to simulate the input data for the pseudo-random binary sequences. Through the calculation of UWS, we obtained solid results for the predictions.

scholarly journals NONCORRALATED DATA ORDERED SAMPLES AS A SINGLE-ELEMENT MULTICHANNEL CONVERTER

2021 ◽  
Vol 2021 (3) ◽  
pp. 74-82
Author(s):  
R.O. Mazmanian ◽  
Keyword(s):  
Normal Distribution ◽  
Statistical Testing ◽  
Random Numbers ◽  
Single Element ◽  
Data Converter ◽  
Random Data ◽  
Chi Square ◽  
Chi Square Test ◽  
Probability Density Function Pdf ◽  
Statistical Criteria

The sufficient closeness of the medians of the ordered samples of random data to the normal distribution is used in computer systems for control, monitoring and diagnosing electric power equipment. However, it remains what other probability density function (pdf) of elements (sample statistics) have such similarities. This paper presents various methods for statistical testing hypotheses for pdf-converter channels as statistics of given sizes odd numbered and ordered samples of bounded and uniformly distributed random numbers. The use of various different criteria and the results of estimates studied under the same conditions showed a sufficient conformity of the results of tests for three statistical criteria. It made possible to draw a reasonable conclusion about the preferable use of the adapted chi-square test for assessing the congruence of analytical pdf channels of the converter with normal distribution. We also suggested using the "statistical closeness window" to define those channels of the converter that do not significantly differ from the normal distribution. In addition, we presented an empirical formula determining the dependence of the size of the window of the statistical closeness window on the sample size. The results of the research are summarized in a statistical model of a multichannel uncorrelated data converter. References 27, figures 7.

scholarly journals Generating a Strong Key for a Stream Cipher Systems Based on Permutation Networks

2007 ◽  
Vol 4 (3) ◽  
pp. 501-504
Author(s):  
Baghdad Science Journal
Keyword(s):  
Communication Systems ◽  
Stream Cipher ◽  
Linear Feedback ◽  
High Complexity ◽  
Long Period ◽  
Auto Correlation ◽  
Crossbar Switches ◽  
Feedback Shift Register ◽  
Pn Sequences ◽  
Randomness Tests

The choice of binary Pseudonoise (PN) sequences with specific properties, having long period high complexity, randomness, minimum cross and auto- correlation which are essential for some communication systems. In this research a nonlinear PN generator is introduced . It consists of a combination of basic components like Linear Feedback Shift Register (LFSR), ?-element which is a type of RxR crossbar switches. The period and complexity of a sequence which are generated by the proposed generator are computed and the randomness properties of these sequences are measured by well-known randomness tests.

scholarly journals METASTABILITY, LYAPUNOV EXPONENTS, ESCAPE RATES, AND TOPOLOGICAL ENTROPY IN RANDOM DYNAMICAL SYSTEMS

2013 ◽  
Vol 13 (04) ◽  
pp. 1350004 ◽  
Author(s):  
GARY FROYLAND ◽  
OGNJEN STANCEVIC
Keyword(s):  
Dynamical Systems ◽  
Finite Type ◽  
Topological Entropy ◽  
Lower Bounds ◽  
Random Systems ◽  
Random Dynamical Systems ◽  
Upper And Lower Bounds ◽  
Random System ◽  
Random Maps ◽  
Frobenius Operator

We explore the concept of metastability in random dynamical systems, focusing on connections between random Perron–Frobenius operator cocycles and escape rates of random maps, and on topological entropy of random shifts of finite type. The Lyapunov spectrum of the random Perron–Frobenius cocycle and the random adjacency matrix cocycle is used to decompose the random system into two disjoint random systems with rigorous upper and lower bounds on (i) the escape rate in the setting of random maps, and (ii) topological entropy in the setting of random shifts of finite type, respectively.

scholarly journals Fast carrier recovery in FHSS systems with DDS based Costas loop

2015 ◽  
Vol 19 (1) ◽  
pp. 3
Author(s):  
Slavko Šajić
Keyword(s):  
Coherent State ◽  
Communication Systems ◽  
Local Oscillator ◽  
Frequency Hopping ◽  
Voltage Controlled Oscillator ◽  
Carrier Recovery ◽  
Coherent Demodulation ◽  
Fast Change ◽  
Short Period ◽  
Costas Loop

Owing to fast change of carrier frequency, the usageof coherent demodulation methods in Frequency-Hopping SpreadSpectrum (FHSS) communication systems is limited by thecoherent state acquisition performed by the local oscillator. Toget around this difficulty, it is needed to implement the circuitwithin the FHSS system that is able to rapidly generate acoherent carrier. The work presented in this paper proposes arealization of Costas loop based on a combination of DirectDigital Synthesis (DDS), (Temperature-Compensated) Voltage-Controlled Oscillator ((TC)VCXO), and Phase-Locked Loop(PLL), which in particular enables a short period (less than 100μs) required for a local oscillator to reach the coherent state. Theimplemented model is thoroughly described with measurementsresults also provided.

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