Keying

About: Keying is a research topic. Over the lifetime, 6598 publications have been published within this topic receiving 82943 citations.

SBK: A Self-Configuring Framework for Bootstrapping Keys in Sensor Networks

Abstract: Key pre-distribution has been claimed to be the only viable approach for establishing shared keys between neighboring sensors after deployment for a typical sensor network. However, none of the proposed key pre-distribution schemes simultaneously achieves good performance in terms of scalability in network size, key-sharing probability between neighboring sensors, memory overhead for keying information storage, and resilience against node capture attacks. In this paper, we propose SBK, an in-situ self-configuring framework to bootstrap keys in large-scale sensor networks. SBK is fundamentally different compared to all key pre-distribution schemes. It requires no keying information pre-deployment. In SBK, sensors differentiate their roles as either service nodes or worker nodes after deployment. Service sensors construct key spaces, and distribute keying information in order for worker sensors to bootstrap pairwise keys. An improved scheme, iSBK, is also proposed to speed up the bootstrapping procedure. We conduct both theoretical analysis and simulation study to evaluate the performances of SBK and iSBK. To the best of our knowledge, SBK and iSBK are the only key establishment protocols that simultaneously achieve good performance in scalability, key-sharing probability, storage overhead, and resilience against node capture attacks.

Keying Material Exporters for Transport Layer Security (TLS)

Abstract: A number of protocols wish to leverage Transport Layer Security (TLS) to perform key establishment but then use some of the keying material for their own purposes. This document describes a general mechanism for allowing that.

Automatic modulation recognition using wavelet transform and neural network

Abstract: Modulation type is one of the most important characteristics used in signal waveform identification An algorithm for automatic modulation recognition has been developed and presented in this study The suggested algorithm is verified using higher order statistical moments of wavelet transform as a features set A multi-layer neural network with resilient backpropagation learning algorithm is proposed as a classifier The purpose is to discriminate different M-ary shift keying modulation types and modulation order without any priori signal information Pre-processing and features subset selection using principal component analysis will reduce the network complexity and increase the recognizer performance

Dual-Function MIMO Radar-Communications Via Frequency-Hopping Code Selection

Abstract: Intensifying competition over the frequency spectrum has driven the research effort into strategies for coexistence between radar and communications. Strategies for achieving this range from spectrum sharing using cognitive radio techniques to co-design where the radar and communications systems are re-imagined to ensure they do not interfere with each other. In this paper we propose a new signaling scheme for Dual-Function Radar Communications (DFRC) that enables frequency-hopped multiple-input-multiple-output (MIMO) orthogonal radar wave-forms to carry communication symbols. The Frequency-hopping (FH) code is changed from subpulse to another such that the index of the selected code carries the desired symbol. Contrary to recent phase-shift keying (PSK)-based schemes which embed one PSK symbol within each subpulse, the proposed scheme does not suffer from phase-discontinuity and is shown to have better spectral efficiency. We show that the data rate that can be achieved using the proposed scheme is proportional to the size of the FH code, the number of transmit antennas, number of subpulses within a pulse repetition interval, and pulse repetition frequency. Simulations examples are provided to evaluate the performance of the proposed method and demonstrate the effectiveness of this information embedding scheme.

Exact probability of error of BPSK communication links subjected to asynchronous interference in Rayleigh fading environment

Abstract: We derive a new expression for the exact bit-error probability for the detection of a coherent binary phase-shift keying signal experiencing a number of asynchronous interferers having unequal power levels in Rayleigh fading channels. The new expression is readily computed in terms of the coefficients of a Hermite polynomial.