I did not know such thing is possible. very cool! thx for pointing it out! :)

but still..some rhetorical questions: Is KMS based on this concept? Is it's implementation open sourced? Is it verified to run unchanged in the instance I pay? Who is verifying it? Who is paying the one verifying it? Can I meet him / her to drink a coffee and build trust between us?

pls, do not misunderstand me. I got more trust in the amazon techs than in my own ability to admin a complex linux system on bare metal. But while all that is great progress toward security we still need to make a leap to find a solution. don't we?