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Re: [Bug-ddrescue] fill-mode vs luks encryption

From: Scott Dwyer
Subject: Re: [Bug-ddrescue] fill-mode vs luks encryption
Date: Fri, 06 Jun 2014 19:00:17 -0400
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0

On 6/5/2014 11:30 PM, Atom Smasher wrote:

on other failing drives i've used the "fill mode" to identify files that haven't been completely recovered, but this disk is encrypted (with luks). because the drive is encrypted, filling the un-recovered parts of the image with a string will NOT put that string in the files, after the image is decrypted.

before i spend too much time on it, does anyone have any tips or ideas for identifying which files are missing some of their bits?

I am assuming that you are used to using the find/grep method. Check out this link for more ideas that may work in your case, assuming the file system is mountable:

The one that is likely to work the best in your case would be the one using MD5 checksums. The idea is to make a list of all the files MD5 checksums, then use the fill mode to change the bad sectors, then make another list of the checksums and compare the lists. Because the disk is encrypted you won't be able to find a specific pattern like you say, but this method looks for differences in the files themselves which won't care what the pattern is.

I have never personally used that method, but I am sure others have.


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