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Decius comments on Causal Universes - Less Wrong
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Of course, there's no reason to strictly believe that what you thought was a future version of yourself wasn't either lying or a simulacrum of some kind, or that any note you receive after intending to send a note back to yourself hasn't been intercepted and subverted.
Which leads to interesting stories when those expectations are subverted, but only after they've been established.
True! That's why every twelve-year-old establishes elaborate passphrases for identifying alternate / time-displaced selves.
What makes you think that elaborate passphrases are uncountably infinite? Any loop that includes a 'we await confirmation that the plan has succeeded before we implement it' clause at the beginning is virtually foolproof. In order to foil such a plan, one needs to overcome the adversary, prevent them from signaling failure (ever!), and then manage to signal success. (So that the plan is set into motion.)