linux-ext4 - Re: Shred mount option for ext4?

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Message-ID: <456188DC.5030107@clusterfs.com>
Date:	Mon, 20 Nov 2006 16:22:12 +0530
From:	Rupesh Thakare <rupesh@...sterfs.com>
To:	"Wolber, Richard C" <richard.c.wolber@...ing.com>
CC:	Andreas Dilger <adilger@...sterfs.com>,
	Nikolai Joukov <kolya@...sunysb.edu>,
	Erik Mouw <erik@...ddisk-recovery.com>,
	Samuel Tardieu <sam@...1149.net>, linux-ext4@...r.kernel.org
Subject: Re: Shred mount option for ext4?

Wolber, Richard C wrote:
>> On Wednesday, November 01, 2006 8:17 AM Andreas Dilger Wrote:
>>
>> Did anyone discuss doing this with crypto instead of actually 
>> overwriting the whole file?  It would be pretty easy to store 
>> a per-file crypto key in each inode as an EA, then to 
>> "delete" the file all that would be needed would be to erase 
>> the key in a secure matter (which is a great deal easier 
>> because inodes don't move around on disk).
>>     
>
> If it's cheap to delete the keys, it's also cheap to harvest 
> the keys. A per file crypto-key lowers the barrier to entry.
>   
That's true. But can't we combine the advantages of single-secure-key 
and per-file krypto key ?
Can't we have a half single-secure-key combined with half 
per-file-krypto ? Key management overhead is not
worse than that for single-secure-key. This gives offers same security 
with ease for shredding.

Cheers,
Rupesh
> This is Schneier 101.
>
>
> ..Chuck..
> -
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