Adaptive ternary timing covert channel in IEEE 802.11. Issue 16 (7th July 2016)

• Record Type: Journal Article
• Authors: Tahmasbi, Fatemeh; Moghim, Neda; Mahdavi, Mojtaba
• Is Part Of: Security and communication networks. Volume 9:Issue 16(2016)
• Page Start: 3388
• Page End: 3400
• Publication Date: 2016-07-07
• Subjects: covert channels -- wireless networks -- CSMA/CA -- Kolmogorov–Smirnov test -- regularity test; Computer networks -- Security measures -- Periodicals; Computer security -- Periodicals; Cryptography -- Periodicals; 005.805
• DOI: 10.1002/sec.1545
• Languages: English
• ISSNs: 1939-0114

Abstract

Abstract: Covert channel is one of the most interesting topics in the computer networks security. Covert channel designers are seeking to discover weaknesses in the communications algorithms to use them as the medium for covert transmission. Broadcast nature of wireless channels has provided a favorable environment for the design of the hidden channels. CSMA/CA is used to control channel access inIEEE 802.11 network. Random features of this algorithm can be used to create timing covert channel. The statistical distribution of the free time intervals' duration is used in this paper for covert channel establishment. Hidden messages are sent via manipulating the timing of the overt packets' transmission. Hidden transceiver senses the wireless channel continuously to be adapted to the dynamic network condition and to be less detectable. To increase the covert channel's accuracy, some free interval durations are not used that leads to security degradation. This problem is also covered by a gap covering method that is based on the summation of the channel sensed free time interval distribution and a normal one. Hidden nodes also estimate the number of active nodes and adapt their behavior accordingly to keep their compatibility with the network. The statistical Kolmogorov–Smirnov and regularity tests are used to assess the security of the covert channel. Simulation results show that the proposed covert channel have a high bit rate along with high security. © 2016 The Authors Security and Communication Networks published by John Wiley & Sons Ltd Abstract : The Adaptive timing covert channel uses the distribution of temporal characteristics of the IEEE 802.11 and manipulates the timing between the packets in order to transmit covert messages. To adapt with network conditions, it updates the temporal distribution on the fly and estimates the number of active wireless nodes in the network. It achieves a high bit rate with high security communication.