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Passphrase | Surveillance Self-Defense
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Surveillance
Self-Defense
Self-Defense
Passphrase
A passphrase 
is a kind of password . We use "passphrase" to convey the idea that a password which is a single word is far too short to protect you and a longer phrase is much better. The webcomic XKCD has a good explanation. https://xkcd.com/936/