[dm-crypt] Query on validating cryptsetup

Arno Wagner arno at wagner.name
Sun Oct 7 22:53:44 CEST 2012

On Sun, Oct 07, 2012 at 09:50:46PM +0200, Milan Broz wrote:
> On 10/03/2012 07:28 PM, Abhishek Tiwari wrote:
> > I am trying to use cryptsetup for an SD card. I create the crypto
> > mapper device and write a file to it. For the purpose of validation,
> > I am using a fixed key "11111111" as passphrase. Then I tried to see
> > the contents of this SD card using a reader and WinHex. Unfortunately
> > these contents do not match with an encrypted copy of same file that
> > was encrypted using this online DES encryption tool: 
> > http://www.tools4noobs.com/online_tools/encrypt/ I specified
> > algorithm as DES and mode as CBC.
> Well, if it is real use, never use DES, it is no longer secure enough.

Indeed. Known plaintext attack for DES is doable some hours now.
I still remember when 56 bit DES was considered secure ;-)

Arno Wagner,    Dr. sc. techn., Dipl. Inform.,   Email: arno at wagner.name 
GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 338F
One of the painful things about our time is that those who feel certainty 
are stupid, and those with any imagination and understanding are filled 
with doubt and indecision. -- Bertrand Russell 

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