Privacy in the information age
"The opening of ... mail, like the revelations that the N.S.A. has been monitoring telephone, e-mail, and Internet use, illustrates the intricacy of the relationship between secrecy and privacy. Secrecy is what is known, but not to everyone. Privacy is what allows us to keep what we know to ourselves. ... As a matter of historical analysis, the relationship between secrecy and privacy can be stated in an axiom:...