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Towards intrusion detection for encrypted networks

Goh, Vik Tor, Zimmermann, Jacob, & Looi, Mark H. (2009) Towards intrusion detection for encrypted networks. In 2009 International Conference on Availability, Reliability and Security, 16-19 March 2009, Fukuoka Institute of Technology, Fukuoka.

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Abstract

Traditionally, network-based Intrusion Detection Systems (NIDS) monitor network traffic for signs of malicious activities. However, with the growing use of Virtual Private Networks (VPNs) that encrypt network traffic, the NIDS can no longer analyse the encrypted data. This essentially negates any protection offered by the NIDS. Although the encrypted traffic can be decrypted at a network gateway for analysis, this compromises on data confidentiality. In this paper, we propose a detection framework which allows a traditional NIDS to continue functioning, without compromising the confidentiality afforded by the VPN. Our approach uses Shamir's secret-sharing scheme and randomised network proxies to enable detection of malicious activities in encrypted channels. Additionally, this approach is able to detect any malicious attempts to forge network traffic with the intention of evading detection. Our experiments show that the probability of a successful evasion is low, at about 0.98\% in the worst case. We implement our approach in a prototype and present some preliminary results. Overall, the proposed approach is able to consistently detect intrusions and does not introduce any additional false positives.

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ID Code: 20648
Item Type: Conference Paper
Additional URLs:
Keywords: intrusion detection, shamir's secret-sharing
DOI: 10.1109/ARES.2009.76
Subjects: Australian and New Zealand Standard Research Classification > INFORMATION AND COMPUTING SCIENCES (080000) > COMPUTER SOFTWARE (080300) > Computer System Security (080303)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Institutes > Information Security Institute
Copyright Owner: Copyright 2009 IEEE
Deposited On: 25 May 2009 14:08
Last Modified: 29 Feb 2012 23:55

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