"It seems that 'national security' is the root password to the Constitution. As with any dishonest superuser, the best countermeasure is strong encryption."

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Now, with a warrant, they can always go to the information service provider and attempt to get that information. But even then, they may not be able to because the party selling the encryption services may be a third party and may not even know who the parties are that are communicating.

— Rod Beckstrom