[Cryptography] Photon beam splitters for "true" random number generation ?
jsd at av8n.com
Sun Dec 27 13:31:14 EST 2015
On 12/26/2015 09:53 PM, Dave Horsfall wrote:
> A good hot flame? What's the melting point of gold and silicon, anyway?
material MP / °C
Gold: 1,064 (irrelevant, but since you asked)
> What do jewellers use; just a hand-held blow-torch, isn't it?
chemistry T / °C
One amusing low-temperature option is to drop the chip into a pot
of molten aluminum, Terminator-style. Silicon will /dissolve/
into molten aluminum, much as sugar dissolves into water, at
temperatures well below the MP of the solute.
I suggest that a belt sander or even a simple disk sander makes a
more convenient solution.
In any case, the physics problem is relatively easy to solve ...
but that leaves us with other problems.
For starters, a chip can hold many gigabytes of data. Most crypto
operations, even one-time-pad operations, don't need that much, so
it is wasteful to destroy one chip per operation.
Even more serious is the user-interface problem. In this forum
we bemoan the fact that users all-too-often choose a low-entropy
password, and re-use the password across multiple sites, because
it is "more convenient". Therefore it strikes me as unlikely that
ordinary users can be trusted to annihilate one micro-SD card per
message, or one USB stick per message. It's just too inconvenient.
It seems to me that for user-interface reasons alone, we really
need a flash memory with good crypto-erase performance. Features
-- Can erase small chunks (not just the whole drive).
-- "Spare" copies of the data are never left lying around on
the device. If data is moved for wear-leveling, the old version
is immediately obliterated. If blocks need to be moved to the
bad-block list, they are immediately obliterated.
-- Simple high-level interface. In particular, overwriting a
logical block should suffice to obliterate the previous contents.
-- Good efficiency for normal operations.
This is all eminently doable!
A lot of the required pieces are already lying around. See
and references therein.
More information about the cryptography