[blattimwind]

Pen and paper in a good old fashioned steel cabinet (you can get those with some nice solid wood enclosing as well) require actual physical access to read.

However, side channels exist. If you write classified information on a correspondence pad, then the pad itself becomes a classified item, too. Obviously.

[mulmen]

Who gets keys to the cabinet? How do you know they haven't been duplicated?

What if there is a fire? Do you keep a copy of the files somewhere? How do you control access to those?

[blattimwind]

You get literally the exact same set of problems with computers, plus all problems computers bring to the table for free.

[mulmen]

You're pretending pen and paper doesn't bring another set of problems of its own.

[blattimwind]

No, I'm just not exhaustively listing the advantages of computers, because (i) not what this thread is about (ii) by and large we're aware of them.

[hinkley]

Did you let Richard Feynman into the building...

[viraptor]

> Pen and paper in a good old fashioned steel cabinet (you can get those with some nice solid wood enclosing as well) require actual physical access to read.

On the other hand, also the bad part is that pen and paper require actual physical access to read ;)