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[freehaven-dev] Tempest attacks on car radios

Thanks go to Susan for pointing this one out. I've added a footnote
to the anonymity chapter: (this is scary...except I'm not even scared
anymore. I guess I'd already been assuming it.)

Anonymity, when compared to pseudonymity, means that the agent 
performing the operation has no observable persistent characteristics.
For instance, turning on a radio is a nice way of receiving
information anonymously (modulo Tempest attacks{\footnote {Actually,
{\tt http://www.mobiltrak.com/} is a company which records which radio
station cars on the highway are tuned to. So far, they claim to have
surveyed over 125 million cars.}). Reading the advertisements in the