NDLI: Enhancing transmission security for multimedia applications

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Enhancing transmission security for multimedia applications

Content Provider	ACM Digital Library
Author	Tsipouridou, Despoina Efstathiou, Dimitrios Papadopoulos, George D. Pavlidou, Fotini-Niovi
Abstract	High levels of security are essential in wireless communications multimedia applications. In this paper, we propose a new approach to performance enhancement of existing physical layer security schemes, taking advantage of the characteristics of the OFDM technique, while exploiting the channel characteristics during the channel estimation process. OFDM is carrying on its subcarriers the pilot symbols, essential for the pilot channel estimation process performed at the legitimate receiver. Conventionally, the position of the subcarriers carrying the pilot symbols is fixed and known to all receivers. In this paper the positions of the subcarriers carrying the pilot symbols change randomly from one OFDM symbol to the next according to a selected distribution around the fixed predefined positions within the OFDM symbols. When a mobile phone communicates to an eNodeB for the first time, the eNodeB and the mobile phone use the imprinting mechanism to establish trust between them. In this phase the eNodeB and the mobile phone share information (e.g. the time-stamp of initial communication) that will allow identification between them in order to set-up the mechanism of non-fixed pilot subcarrier positions using encryption. Thus, an eavesdropper, not capable to decrypt the information related to the non-fixed pilot subcarrier positions is forced to perform blind channel estimation. Our approach is focused on the channel characteristics in order to provide security mechanisms for transmission of multimedia data. The theoretical analysis is confirmed by simulations, and the metrics used are the channel mean square error, the bit-error rate and the secrecy capacity. As stated in the results Section, the proposed scheme is very simple, and robust, strengthening privacy in multimedia applications.
Starting Page	150
Ending Page	155
Page Count	6
File Format	PDF
ISBN	9781450335515
DOI	10.1145/2801948.2801954
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2015-10-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Bit-error rate Ofdm Blind channel estimation Physical layer security Secrecy capacity Channel mse Pilot channel estimation
Content Type	Text
Resource Type	Article

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