By NICOLE PERLROTH Published: November 16, 2012 If David H. Petraeus couldn’t keep his affair from prying eyes as director of the Central Intelligence Agency, then how is the average American to keep a secret? Megan Piontkowski Chester Higgins Jr./The New York Times "Everyone is reading everyone else’s e-mails," says Dan Kaminsky, an Internet security expert, "because it’s just so easy to do." In the past, a spymaster might have placed a flower pot with a red flag on his balcony or drawn a mark on page 20 of his mistress’s newspaper. Instead, Mr. Petraeus used Gmail. And he got caught. Granted, most people don’t have the Federal Bureau of Investigation sifting through their personal e-mails, but privacy experts say people grossly underestimate how transparent their digital communications have become. “What people don’t realize is that hacking and spying went mainstream a decade ago,” said Dan Kaminsky, an Internet security res
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