Re: Encrypted Filesystem.

[Sharath <sharath_75@xxxxxxxxx>]

Hi Jeba

just thinking out loud:

> if that password == password in superblock 
> mount filesystem 
> else
> mount fails

If the password is also stored then one can use a disk
utility to examine the harddisk and retrieve the
password unless you further encrypt the data too.

while I haven't worked on filesystems, a better
spproach is encrypt the filesystem with the password
which I guess is a symmetric cipher you're using.
Store a CRC of the a particular data. After decryption
if the CRCs match, then allow further access.

essentially:

get passwd
plaintext = decipher(passwd, ciphertext)
if (crc(plaintext)==stored_crc)
{
 /*allow access*/
}
else
{
 /*bomb out with error*/
}

regards,
Sharath


		
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