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Why was Phil Zimmerman's invention of PGP in 1991 controversial?
It violated a lot of previously existing patents.
It made RSA obsolete.
It requires completely new PKI systems, an organizational expense.
It brought asymmetric key encryption technology to the masses. The controversy was that it can be used by criminals.
It brought asymmetric key encryption technology to the masses. The controversy was that it can be used by criminals. None of the other options are even slightly true.
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