One time pads obviously.
How to store your nuclear secrets?
How would you store the original / master copy then?
Russia stores sensitive data on laser etched plates in extreme miniature, and uses a set of magnifying lenses to decode and display it. The plate alone is worthless without the decoder lens, and it's pretty much indestructible.
They also invented holographic storage and are going to move on to that next.
>>>/leddit/
Is this your first day on the internet or what?
Air gaps are not without flaws either. For one the computer is potentially vulnerable to things like PowerHammer and sigint attacks. For two passwords are just as vulnerable to social engineering attacks as that library of books is. Three it is easier to transmit the data once you are "in" than it is with a library of books. In fact, smuggling the whole terminal out may not lay outside the realm of possibilities.
The question being asked shouldn't be "Why was it stored on paper in binders." The question should be "How was this individual allowed near the paper and binders to begin with?"
I haven't heard of those before, but it seems those attacks require compromising the target machine first. If not, you can just run random computations to add noise to the power consumption.
Multiple passwords is to have the ability to revoke access from certain individuals who no longer need access to the encrypted data or who need to have their keys cycled. If there is a leak, you know who exactly it came from.
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Write them in a made up language+script only you and a few other certified operators know.
How do we even know those binders are real? Israel has a vested interest in convincing the world that Iran is a threat. On top of that, jews are the most lying, conniving creatures ever to walk the earth.