Comment by DuskStar

7 years ago

> > Attacking a single 256 bit key is exactly as equally impossible as attacking a 256 bit RNG pool used to generate 100 keys.

> But both are strictly easier than attacking 100x independently created 256-bit keys. The /dev/random case.

Both are impossible. Like, 'Solar System turned into thermodynamically optimal computronium fails' impossible. (seriously - '((mass of solar system * (speed of light)^2) / 0.0172 electronvolts ) / (2^256)' for calculations performed at 20C [0], and that evaluates to 5*10^-10. Drop the assumed temperature to 2.75K - the cosmic background temperature - and the energy per computation drops by a factor of several hundred, but that's still not nearly enough)

Or, put another way - if you can bruteforce 2^256, you can do that 100 times. (Even if you encrypt an object 100 times, you'll still only need to do ~2^264 work - not 2^25600)