We tend to think of traffic analysis as a modern technique,
but it's
actually quite old. Here is a message from a spy, observing
the
activities of two of (English Queen) Elizabeth I's
courtiers, whom he
suspected of trying to manipulate her successor:
many secret meetings are made between them, where, after
serious
consults, they dispatch messengers and packets of letters,
this
sometimes twice in a week.
This was in 1602.
--Steven M. Bellovin, http://www.cs.columbi
a.edu/~smb
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