Messages in this thread | | | Date | Wed, 14 Apr 2004 11:43:34 +0200 | From | Jörn Engel <> | Subject | Re: Using compression before encryption in device-mapper |
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On Wed, 14 April 2004 08:54:56 +0200, Guillaume Lacôte wrote: > Le Mardi 13 Avril 2004 19:45, Jörn Engel a écrit : > > Thank you, I didn't know about Jffs2; however I believe it is not an > implemendation at the device level as I would like.
Correct.
> Since space efficiency is _not_ my aim I plan to forcibly allocate 3 physical > blocks for every 2 "compressed" blocks (as it should (?) always fit with a > dynamic Huffman encoding). > > [...] > > Oops ! I thought it was possible to guarantee with the Huffman encoding (which > is more basic than Lempev-Zif) that the compressed data use no more than 1 > bit for every byte (i.e. 12,5% more space).
Makes sense, although I'd like to see the proof first. Shouldn't be too hard to do.
> > Performance should not be a big issue, as encryption is a performance > > killer anyway. > I am not sure that this is good news ;)
Is it news? ;)
> > Again, depends on the user. But from experience, there are plenty of > > users who want something like this. > Unfortunately I failed to find substantial code/documentation on encryption > plugin for Reiser4, for example. Do you know about some ?
My interest in reiserfs has ceised some time ago. Have you asked their list? <reiserfs-list@namesys.com>
Jörn
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