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 is 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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