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This paper considers the problem of packet classification in a co-mingled traffic stream. Given an encrypted co-mingled stream consisting of different protocol flows originating from different sources; the authors investigate if it is possible to assign packets to their respective sources and identify the protocol for each source. Encryption makes it difficult to obtain any information from packet headers or payloads. Consequently the only information available to an observer is the packet size, arrival times, direction and power levels. This paper presents a statistical approach that analyses the sizes and power levels of packets belonging to each protocol and uses this information to classify the packets in the co-mingled stream.
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