NSA Surveillance: Packet-Sniffing vs. Data Mining
GW Law Prof Orin Kerr has a theory on the NSA warrantless surveillance program, based upon some material in James Risen's book. Orrin is very much an expert in these issues. One of his articles is Kerr, Orin S., "Internet Surveillance Law After the USA Patriot Act: The Big Brother That Isn't" . Northwestern University Law Review, Vol. 97, 2003 (downloadable here.)
Orin thinks the program may have involved packet-sniffing which he likens to a giant pen register or trap and trace (the former records numbers dialed from a phone, the latter records telephone numbers of incoming calls and neither intercept the content of communications) rather than data-mining.
Packet sniffing refers to installing a monitoring device on a steam of traffic that looks for specific sequences of letters, numbers, or symbols.....The term "data-mining" is usually used to mean taking an already-gathered database of information, and then performing analysis on the gathered database in lots of ways to identify patterns and characteristics.
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