—This paper proposes an optimal maximum a poste-riori probability decoder for variable-length encoded sources over binary symmetric channels that uses a novel state-space to deal with the problem of variable-length source codes in the decoder. This sequential, finite-delay, joint source-channel decoder delivers substantial improvements over the conventional… (More)
This paper presents a critical analysis of some of the current steganalysis methodologies. The pros and cons of these methods are discussed from statistical and usability perspectives. It is concluded that no single strategy works best. Depending on the amount of statistical information available at hand, a proper choice has to be made.
The authors are members of IEEE SCC41; however, the views presented herein are those of the authors and do not represent the views of the IEEE SCC41 or its projects.
— In this paper, we present an analytical model as well as a practical mechanism to detect denial of service (DoS) attacks on secondary users in dynamic spectrum access (DSA) networks. In particular, we analyze primary user emulation attacks (PUEA) in cognitive radio networks without using any location information and therefore can do away with any… (More)
— Encryption is one of the fundamental technologies that is used in digital rights management. Unlike ordinary computer applications, multimedia applications generate large amounts of data that has to be processed in real time. So, a number of encryption schemes for multimedia applications have been proposed in recent years. We analyze the following… (More)
Minimizing power consumption is crucial in battery power-limited secure wireless mobile networks. In this paper, we (a) introduce a hardware/software set-up to measure the battery power consumption of encryption algorithms through real-life experimentation, (b) based on the profiled data, propose mathematical models to capture the relationships between… (More)
We present a Neyman-Pearson composite hypothesis test (NPCHT) and a Wald's sequential probability ratio test (WSPRT) to detect primary user emulation attacks (PUEA) in cognitive radio networks. Most approaches in the literature on PUEA assume the presence of underlying sensor networks for localization of the malicious nodes. There are no analytical studies… (More)
—In this paper we present SpiderRadio a cognitive radio prototype for dynamic spectrum access networking. Spider-Radio is built using commodity IEEE 802.11a/b/g hardware and the open source MadWiFi driver. This helps us in developing and testing our prototype without having to buy and manage several licensed spectrum bands. We begin with a discussion on the… (More)