Secure Interleaving - Physical Layer Security Enhancement of OFDM Based System

Khan, Muhammad Asif and Jeoti , Varun and Rana, Shahid Manzoor (2011) Secure Interleaving - Physical Layer Security Enhancement of OFDM Based System. In: 2nd International Conference on Software Engineering and Computer Systems, ICSECS 2011, 27-29 June 2011 , Kuantan, Malaysia.

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Interleavers are typically used to distribute burst of errors, so they appear as simple random errors. Alternatively, if interleaving patterns are kept secure, then these patterns can be introduced as a physical (PHY) layer security device. In this paper, an efficient technique to introduce security at physical (PHY) layer is proposed to enhance the security of 802.11i, which is designed to improve the security at medium access control. Since it does not emphasize on availability therefore several denial of service (DoS) attacks are possible. The DoS attacks are easy to mount because management and control frames are unprotected and so are MAC headers. This paper proposes a secure seed based random interleaving technique to scramble the OFDM constellation symbols to encrypt data transmission to resist these malicious attacks. In order to analyze the suitability of proposed technique as PHY layer security device keysensitivity analysis is carried out. The scrambling is completely reversible with the use of appropriate key. However, use of a wrong initial condition even at 4th decimal point produces entirely different sequence resulting in erroneous constellations with equal probability. To analyze the effectiveness of proposed technique various security attacks are analyzed in detail.

Item Type:Conference or Workshop Item (Paper)
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments / MOR / COE:Departments > Electrical & Electronic Engineering
ID Code:7045
Deposited By: Assoc Prof Dr Varun Jeoti
Deposited On:08 Dec 2011 01:55
Last Modified:19 Jan 2017 08:23

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