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DateThu, 4 Mar 2004 16:08:36 +0100
FromPavel Machek <>
SubjectRe: dm-crypt, new IV and standards
Hi!

> > > Well, CTR mode is not recommended for encrypted file systems because it is very
> > > easy to corrupt single bits, bytes, blocks, etc without an integrity check.
> > > If we add a MAC, then any mode of operation except ECB can be used for
> > > encrypted file systems.
> > 
> > what does "easy to corrupt" mean?  i haven't really seen disks generate
> > bit errors ever.  this MAC means you'll need to write integrity data for
> > every real write.  that really doesn't seem worth it...
> 
> The difference between "_1,000,000" and "_8,000,000" is 1 bit.  If an
> attacker knew enough about the layout of the filesystem (modify times on blocks,
> etc) they could flip a single bit and change your _1Mil purchase order
> approved by your boss to a _8Mil order.

Hmm... long time ago I created crc loop device to catch
faulty disks. If cryptoloop can do that for me... very good!
-- 
64 bytes from 195.113.31.123: icmp_seq=28 ttl=51 time=448769.1 ms         

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