Re: [PATCH 15/26] ubifs: Implement encrypt/decrypt for all IO

[Michael Halcrow]

On Fri, Oct 21, 2016 at 07:21:04PM +0200, Richard Weinberger wrote:
> On 21.10.2016 19:14, Michael Halcrow wrote:
> > Compress-before-encrypt is a hazard.
> > 
> > http://www.iacr.org/cryptodb/archive/2002/FSE/3091/3091.pdf
> 
> I'm fully aware of that. But as usual it depends on the use case.
> Compression is optional in UBIFS, paranoid users can disable it
> when encryption is enabled.

It's not the paranoid users I'm concerned about.  It's those building
systems with complexity and nuance on top of UBIFS who aren't paranoid
enough.

I suggest disabling compression by default when encryption is enabled,
unless the user explicitly enables both.

> 
> Thanks,
> //richard