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Analysis of the secure RTP protocol on voice over wireless networks using extended MedQoS

Published: 08 March 2009 Publication History

Abstract

This paper presents an empirical investigation of the impact of Secure RTP (SRTP) on VoIP calls over wireless networks: 802.11 and Bluetooth. For the purpose of evaluating this impact we developed an analysis tool based on E-Model and security aspects of SRTP which attempts to determine the balance of quality of service versus security.
The results demonstrate that the impact of SRTP to VoIP should not be disregarded. MOS scores of secure calls computed from E-Model pointed out an undesirable level of quality of service on single calls using wireless channels. This quality degradation also leads to the reduction of channel capacity to offer simultaneous calls. The developed analysis tool indicated three important factors to this degradation: time to encrypt, time to authenticate and time to form a cryptographic context for each SRTP packet sent and received.

References

[1]
M. Baugher, D. McGrew, M. Naslund, E. Carrara, and K. Norrman. The Secure Real-time Transport Protocol (SRTP). RFC 3711 (Proposed Standard), Mar. 2004.
[2]
A. Bilan. Streaming audio over bluetooth acl links. Information Technology: Coding and Computing {Computers and Communications}, 2003. Proceedings. ITCC 2003. International Conference on, pages 287--291, 28--30 April 2003.
[3]
A. Lima, L. Carvalho, J. Souza, and E. Mota. VoIP Management: Speech Quality Monitoring Architecture based on Statistical Analysis. International Journal of Network Management, 2007.
[4]
C. McKay and F. Masuda. Empirical studies of wireless voip speech quality in the presence of bluetooth interference. Electromagnetic Compatibility, 2003 IEEE International Symposium on, 1: 269--272 vol. 1, 18--22 Aug. 2003.
[5]
A. Nascimento, A. Passito, E. Mota, E. Nascimento, and L. Carvalho. Can i add a secure voip call? World of Wireless, Mobile and Multimedia Networks, 2006. WoWMoM 2006. International Symposium on a, pages 3 pp.-, 26--29 June 2006.
[6]
A. Passito. Evaluation of Security Protocols on Voice over IP Networks. Master's thesis, Universidade Federal do Amazonas, Manaus, Brazil, 2008.

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  1. Analysis of the secure RTP protocol on voice over wireless networks using extended MedQoS

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      cover image ACM Conferences
      SAC '09: Proceedings of the 2009 ACM symposium on Applied Computing
      March 2009
      2347 pages
      ISBN:9781605581668
      DOI:10.1145/1529282
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      Published: 08 March 2009

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      Author Tags

      1. QoS
      2. SRTP
      3. VoIP
      4. authentication
      5. encryption
      6. quality of service
      7. voice over IP
      8. wireless security

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      SAC09: The 2009 ACM Symposium on Applied Computing
      March 8, 2009 - March 12, 2008
      Hawaii, Honolulu

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