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http://ise.gmu.edu/~xwangc/Publications/CCS05-VoIPTracking.pdf

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From last CRYPTO-GRAM

Kobi Alexander fled the United States ten days ago. He was tracked down
in Sri Lanka via a Skype call. Ars Technica explains: "The fugitive
former CEO may have been convinced that using Skype made him safe from
tracking, but he -- and everyone else that believes VoIP is inherently
more secure than a landline -- was wrong. Tracking anonymous
peer-to-peer VoIP traffic over the Internet is possible. In fact, it can
be done even if the parties have taken some steps to disguise the
traffic." Let this be a warning to all of you who thought Skype was
anonymous.
http://www.haaretz.com/hasen/spages/754476.html
http://arstechnica.com/news.ars/post/20060824-7582.html
http://ise.gmu.edu/~xwangc/Publications/CCS05-VoIPTracking.pdf