Title: RE: Re: disk encryption modes (Re: RE: Two ideas for random number generation)
- Original Message -
From:
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To: [EMAIL PROTECTED]
Sent: Saturday, April 27, 2002 12:11
PM
Subject: CDR: RE: Re: disk encryption
modes (Re: RE: Two ideas for
Title: RE: Re: disk encryption modes (Re: RE: Two ideas for random number generation)
Instead of adding 16 bytes to the size of each sector for sector IV's how about having a separate file (which could be stored on a compact flash card, CDRW or other portable media) that contains the IV&
- Original Message -
From: "Adam Back" <[EMAIL PROTECTED]>
> Joseph Ashwood wrote:
> > Actually I was referring to changing the data portion of the block
> > from {data} to {IV, data}
>
> Yes I gathered, but this what I was referring to when I said not
> possible. The OSes have 512Kbytes
Joseph Ashwood wrote:
> Adam Back Wrote:
> > > This becomes completely redoable (or if you're willing to sacrifice
> > > a small portion of each block you can even explicitly stor ethe IV.
> >
> > That's typically not practical, not possible, or anyway very
> > undesirable for performance (two dis
- Original Message -
From: "Adam Back" <[EMAIL PROTECTED]>
> On Fri, Apr 26, 2002 at 11:48:11AM -0700, Joseph Ashwood wrote:
> > From: "Bill Stewart" <[EMAIL PROTECTED]>
> > > I've been thinking about a somewhat different but related problem
lately,
> > > which is encrypted disk drives.
Right, it sounds like the same approach I alluded to, except I didn't
use a salt -- I just used a fast pseudon random number generator to
make the IV less structured than using the block number directly.
I did some experiments with a used disk and found that if you use the
block number directly f
> You could encrypt twice (CBC in each direction or something), but that
> will again slow you down by a factor of 2.
You can't easily get away with storing the IV as multiple parts of the IO
pipe like to see blocks in 2^n form.
The approach I take in Rubberhose is to calculate the IV from a
ve
On Fri, Apr 26, 2002 at 11:48:11AM -0700, Joseph Ashwood wrote:
> From: "Bill Stewart" <[EMAIL PROTECTED]>
> > I've been thinking about a somewhat different but related problem lately,
> > which is encrypted disk drives. You could encrypt each block of the disk
> > with a block cypher using the s
