(copy pasted from my reply on another comment below)
(copy pasted from my reply on another comment below)
>I cannot be coerced...
vs. "won't", "would never", et. al.
But then, in the worst case scenario - how could Snowden access it himself if he needs the documents?
Spread the password and access details to two people without keeping it yourself. Those two people split their in half without keeping it themselves. The four people who now have the password are the 'kill switch' required to monitor Snowden's location. Snowden has no idea who they are.
Should he be tortured, all he can do is reveal his first two contacts. The torturer will now have to abduct those two people to get the key.
All these second level people know is the two people THEY spoke to. So you need BOTH of the second level to get all four of the third level people.
And then you'll have to abduct another FOUR people to get the key. All before these four people realize Snoden has disappeared.
He knows he can't resist torture. But he doesn't have to. He LITERALLY cannot be coerced.
I posit there's nothing earth shaking on his own notebooks anymore.
Some article somewhere mentioned that he carries 4 notebooks, and then the press started fear mongering and compromiting him by insinuating that the notebooks are full of secrets and government property. Can anybody quote an official claim that the notebooks aren't his own?
http://www.schneier.com/blog/archives/2009/07/laptop_securit...
If I had my documents encrypted with keys that I'd distributed to multiple parties, I'd be shouting it from the rooftops: "No point torturing me, the key is in three pieces and if I don't sign in every week the data will be destroyed so realistically you can't possibly seize all the pieces in the time-frame you'd require! Of course, if you can get all the pieces, just stick us all together in the same room and I promise to give you my piece, so no point torturing me then either."
Seems like there'd be a really strong incentive to have people know you had a mechanism that ensured it.