Right, I get that, but presumably I don't want the recipient to have it unless the switch goes off, or else I wouldn't be using this system - I'd have just given it to the recipient unencrypted.
That's why the archaeologists are supposed to be a disinterested third party, you essentially pay them (and they forfeit their collateral) to not unwrap it.
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The sarcophagus is Enc_arch(Enc_recip(data)) so unwrapping it off chain isn't useful to them.
The only case it would be useful is if they collude with the recipient. I'm not sure how this procotol disincentives this.
Right, I get that, but presumably I don't want the recipient to have it unless the switch goes off, or else I wouldn't be using this system - I'd have just given it to the recipient unencrypted.
That's why the archaeologists are supposed to be a disinterested third party, you essentially pay them (and they forfeit their collateral) to not unwrap it.