USSS, please refer to: https://www.youtube.com/watch?v=eg3_kUaYFJA
USSS, please refer to: https://www.youtube.com/watch?v=eg3_kUaYFJA
Or, what if the passphrase includes top secret information?
Or, what if you passphrase is a declaration that you are under one of those secret court warrant thinamajiggies.
The Brandenburg v. Ohio (1969) Supreme Court case allows for criminalizing speech only if the speech is "directed to inciting or producing imminent lawless action and is likely to incite or produce such action" [1]. "imminent" means that there has to be a near-future, clear time window. "I will kill X president within 3 days" could be illegal. "I will kill X president within a year" is too vague. Regardless, either one could be interpreted as evidence of criminal intent to harm the president. (If you were only joking about killing the president and the jury believes you, then you're fine.)
https://www.aclu.org/issues/national-security/detention/inde...
We have humans to apply the law and use their judgment for exactly this reason.