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I'm a little lost. A difference requires 2 datasets to be known. The random drive is one known variable but where is my data stored as the other variable? |
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Maybe it should say, "with the random data added in." That's how I think of it. It would work. |
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I think I see. Maybe it would be better if you carried the random drive chained to your wrist at all times, and if anyone severed the chain the drive would wipe itself? |
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[Rayfo] The idea is this. Suppose you want
to store byte 124 at a given location on
your "one-time pad" drive, and finds byte
26 there. Therefore, it stores byte 98 at th
ecorresponding location on your "data"
drive. Neither the data drive nor the one-
time drive are useful by themselves.
Together, however, the system can read
bytes 26 and 98 from the corresponding
locations, and add them to recover the
original byte 124. |
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Maybe the title should be "One-time pad
hard drives." |
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Sorta like RAID 5, but with fewer drives and one permanently populated. |
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For all intents and purposes, software like truecrypt [linky] is unbreakable. Moreover, it is extremely flexible, and does not require another drive purchase or the storage of such. |
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Well, this method really doesn't require another drive. It could copy the one-time-pad off the drive, keep it in active memory, and write the encrypted data back onto the same drive--kind of like copying a CD. That'd erase the pad data, if you make sure you fill the disc completely. And then dump the memory. |
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Uh, how do you recover the data if you
erased the pad? |
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Oh, sorry. I've been assuming that this was for mailing the hard drive back to the spymasters in Anvilania--they'd have their copy of the pad for the decoding. I've only met one-time pads as communication in spy novels, and just went the wrong way. |
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My bad. My spymasters will reprimand me. |
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This is like to use entire hard drive as key to encrypt data. (very long key indeed) I say if you have few K worthy of key to encrypt is enough. A small flash card should do the job already. |
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It is interesting that the key size would
equal the data size. In the future, as
processing power increases, would it be
necessary that keys become orders of
magnitude larger than the data itself? |
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Took me a while to get why using a whole disk - as opposed to just a file somewhere - is worth doing: it makes the self-destruct part work much more reliably. (I wouldn't do it with a chip, I'd do it with a sander - but yeah.) |
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The title threw me one this one, and I still don't get it, but this is a good idea, a 60G encryption. The tough part would actually be flling the "key" drive with truly random data. Also I'd be a little worried about disk errors as their effect would double, but that would still be completely manageable.(+) |
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I'd call it RAID -1 encryption. |
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//The title threw me one this one// Me
too. It refers to a "one time pad" ( a
single-use encryption sheet, specifying
the letter substitution for each
character), but it could be clearer. |
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//The tough part would actually be
flling the "key" drive with truly random
data// You could just use a
microphone through suitable software.
The bit-wise encoding of ambient noise
would be effectively random at the level
required. |
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You are right, someone has thought of this already. Eli Biham, Adi Shamir, et al.
Any cryptographic system is as strong as its weakest link. The weakest link in this embodimoent is two-fold: The deletion of the random key on the key-drive, and the proximity of the key -drive to the cyphertext-drive. One can assume the "Eve" of this transaction will be in possession of the key and ciphertext on confiscation of the computing unit.
The natural extension of this idea keeps the pad seperated from the ciphertext. This is already implimented by the OTP dongles (fire-wire and USB drives acting as keys).
You seem *not* to be communicating data (the raison d'etre of encryption) but rather, storing it safely. For safe storage (excluding dissemination) of data, any suitably removed OTP derivative (external, RAM) will suffice. Remember, the Beale ciphers remain intact. |
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//Remember, the Beale ciphers remain
intact.// Isn't that always the way? |
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It might certainly be the case, but it is most certainly not the Beale and end all of this conversation. |
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One possible implementation of this idea is a "Sushi
Train" of hard drives containing one-time pads -- a
one-time pad for every pair of users using the
service. The "sushi" part is chopping up the data into
little bits and sending via an Internet where each leg
is encrypted via one-time pads (so data in transit
would be encrypted with multiple one-time pads).
The "train" part is the constant stream of one-time
pads sufficient to give each user a fresh terabyte of
one-time pad every week. The mailing envelope
could be painted to look like a little boat. |
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