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Re: Not constant sha1sum

Subject: Re: Not constant sha1sum
Date: Sat, 08 Sep 2007 20:54:30 +0200
If hash changes the file had changed.
Hash should be the same for the same file (if not changed) always, if not is useless.
What are you doing with this file? You are writing it while hashing?
You can control the access to the file?
Maybe a hide program is accessing it.


En/na LERTI - Paul Vidonne ha escrit:
Hello all !

Does smb met the following issue : several hash for an
unique file ? Of course a big one (4 GB). OS is Linux Fedora. File system EXT3 mounted on a SATA RAID-5 on Adaptec card


Could you enlighten me ?

Exemple :
[root@spica acquisit]# sha1sum -b 07667-SDH-dd.001
fe8195547af6d7ce76cd2e44160e06310a964063 *07667-SDH-dd.001

[root@spica acquisit]# sha1sum -b 07667-SDH-dd.001
e8dde55722ed1f2424fd7bb6246163120c561927 *07667-SDH-dd.001

[root@spica acquisit]# sha1sum -b 07667-SDH-dd.001
65f5eb98d33f7ccb1a8a82b0e6d916921c9d97b9 *07667-SDH-dd.001

The best is that the second hash is the good one !

Truly yours,

Paul Vidonne
--
LERTI - Laboratoire d'Expertise et de Recherche de Traces Informatiques
http://www.lerti.fr +33.4 76 90 54 21






--
Isaac Perez Moncho GSEC, SSP-GHD, SSP-MPA, Microsoft MCP.
JPL TSolucio S.L
www.tsolucio.com


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