[WrtCdEvrydy]

You can't hack a dumb power switch (or what I assume is a giant breaker)

[hyperhopper]

Yes you can. It's called turning it back on. Getting there is the challenge, but it's not as if defcon is only about digital security

[LordShredda]

My grandfather owns an RSA decryption tool. He calls it a wrench

[lb1lf]

Pedantically speaking, that's more of a key extraction tool than a decryption tool as such.

Most efficient, though.