There's a long, fascinating article in the 23 May Wall Street Journal
on how NSA is (allegedly) tapping undersea fiber optic cables. It's
not clear that this is feasible, but the article claims that the
USS Jimmy Carter, a nuclear-powered sub, is undergoing a $1 billion,
five-year retrofit to equip it to do the taps. The article points out
that even if they can tap the cable, there's another problem: making
sense of that much data.
The article is at http://interactive.wsj.com/articles/SB990563785151302644.htm
for those who subscribe.
--Steve Bellovin, http://www.research.att.com/~smb
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