"Buried in a Brazilian television report on Sunday was the
disclosure that the NSA has impersonated Google and possibly other major
internet sites in order to intercept, store, and read supposedly secure online
communications." "If you visit an impostor version of your bank's website, for
example, the NSA could harvest your login and password, use that information to
establish a secure connection with your real bank, and feed you the resulting
account information—all without you knowing." (thanks Amir)