Nomen Nescio <[EMAIL PROTECTED]> writes:
>Peter Gutmann and Colin Plumb invented a simple trick which provides this
>property in conjunction with CBC or CFB modes. We're going to encrypt/decrypt
>a disk block, which is divided into "packets" which are the cipher block size
>(64 or 128 bits). Le
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- Original Message -
From: "Morlock Elloi" <[EMAIL PROTECTED]>
> > There's no need to go to great lengths to find a place to store the IV.
>
> Wouldn't it be much simpler (having in mind the low cost of storage), to
simply
> append several random bits to the plaintext before ECB encrypton
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Title: RE: Re: disk encryption modes (Re: RE: Two ideas for random number generation)
- Original Message -
From:
[EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Saturday, April 27, 2002 12:11
PM
Subject: CDR: RE: Re: disk encryption
modes (Re: RE: Two ideas for
> There's no need to go to great lengths to find a place to store the IV.
Wouldn't it be much simpler (having in mind the low cost of storage), to simply
append several random bits to the plaintext before ECB encrypton and discard
them upon decryption ?
For, say, 128-bit block cipher and 16-bit
--
At 12:15 PM -0700 on 4/27/02, [EMAIL PROTECTED] wrote:
> > People who think like economists or libertarians will conclude
> > that markets tend to stability, because humans will analyze
> > fluctuations, attempt to predict them, and then take
> > precautionary action to protect themselves
There's no need to go to great lengths to find a place to store the IV.
An encryption mode that bases the IV on block number and propagates
changes throughout the disk block provides effectively just as much
security. The only theoretical weakness of the latter approach is that
if a block's conte
--
On 18 Feb 2002 at 14:37, Sampo Syreeni wrote:
> we still need one of the machines to be outside a firewall. I
> think what anonymous is describing is the situation when each
> and every non-corporate customer is behind a firewall owned by
> an ISP, corporations shield their employees behin
At 12:15 PM -0700 on 4/27/02, [EMAIL PROTECTED] wrote:
> People who think like economists or libertarians will conclude
> that markets tend to stability, because humans will analyze
> fluctuations, attempt to predict them, and then take precautionary
> action to protect themselves, which will ha
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's for
--
On 25 Apr 2002 at 18:26, Ken Brown wrote:
> This kind of thing has implications for economics & technology &
> markets of course (cf Santa Fe, ad infinitum). People who think
> like ecologists tend to assume that a more complex market, with
> more participants, and more kinds of interacti
To: [EMAIL PROTECTED]
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Ref.: Romanian Industrial Design Export Services
Our anti-spamming company policy:
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- 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.
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hi.
I tried a programme in C under dos.
It would check 444 words per second on a 133 mega
hertz intel processor
and the same number of checks on a 1 Giga hertz
processor.
Is it because the dos clock runs at a slow constant
speed?
Also what if the same code is ported to unix.Is the
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The problem with a random IV in disk encryption is that you may not have
anywhere to store it, since you're already using all of your disk space.
Using hash of block number as IV works except that in most encryption
modes, if the first part of the plaintext is unchanged, that part of
the ciphertex
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