Many anonymity enhancing techniques have been
proposed based on packet encryption to protect the communication anonymity of
mobile ad hoc networks (MANETs). However, in this paper, we show that MANETs
are still vulnerable under passive statistical traffic analysis attacks. To
demonstrate how to discover the communication patterns without decrypting the
captured packets, we present a novel statistical traffic pattern discovery
system (STARS). STARS works passively to perform traffic analysis based on
statistical characteristics of captured raw traffic. STARS are capable of
discovering the sources, the destinations, and the end-to-end communication
relations. Empirical studies demonstrate that STARS achieves good accuracy in
disclosing the hidden traffic patterns.
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