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In recent years, network coding has been enthusiastically promoted for certain wireless settings as a means of improving throughput and achieving higher capacity. Naturally, such proposals focused on communication issues, while paying less attention to security implications. This paper considers the effect of Link-Layer Encryption (LLE) on network coding in wireless networks. LLE is a feature in current wireless networking standards (such as IEEE 802.11i) and its purpose is to mitigate traffic analysis attacks that are possible even in the presence of end-to-end encryption. The authors model single-source multicast using wireless network coding and show that, unfortunately, LLE significantly decreases the achievable capacity.
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