IDing remote hosts, without them knowing. This paper details the process of Passive Fingerprinting. Passive fingerprinting is based on sniffer traces from the remote system. Instead of actively querying the remote system, all you need to do is capture packets sent from the remote system. Based on the sniffer traces of these packets, you can determine the operating system of the remote host. Just like in active fingerprinting, passive fingerprinting is based on the principle that every operating system's IP stack has its own idiosyncrasies. By analyzing sniffer traces and identifying these differences, you may be able to determine the operating system of the remote host. Craig Smith has written a proof of concept tool called passfing.tar.gz.
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