The Null Device
Hiding in plain sight
, an intriguing PowerPoint presentation (PDF)
analysing spam, and using techniques to determine its origins. Among other claims it makes, spam intended to sell things is in the minority, and a lot of spam consists of other spammers' ads, resent to either identify valid recipients or to act as a carrier for encrypted messages between IRC groups. (It doesn't say anything about al-Qaeda terrorist cells or the like, but one imagines that if someone want to send coded instructions to covert operatives without disclosing their locations to traffic analysis, this would be a hell of a lot less conspicuous than mailing a Hotmail address accessed from a net café in Baluchistan or someplace.)
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