The Duration Matching Algorithm

The matching algorithm expects as input a packet capture (pcap) file gathered by sniffing the exchange between an 802.11 NIC and one of the 802.11 Access Points for which a print database has been assembled for a collection of 802.11 implementations. The input is compared against each print in the database using a particular matching metric. We give five matching metrics. Each matching metric produces a scalar quantity measuring the degree of match between the input and a print. The algorithm outputs a list of 802.11 implementations ordered by decreasing degree of match.

The metrics are presented in order of increasing complexity. Values from one metric are not intended to be comparable to values from another.