lkml.org 
[lkml]   [2003]   [Aug]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC][PATCH] Make cryptoapi non-optional?
On Fri, 15 Aug 2003 09:30:03 +0200
Andries Brouwer <aebr@win.tue.nl> wrote:

> On Thu, Aug 14, 2003 at 06:17:13PM -0600, Val Henson wrote:
>
> > entropy(x) >= entropy(x xor y)
> > entropy(y) >= entropy(x xor y)
>
> Is this trolling? Are you serious?

These lemma are absolutely true. XOR is the worst way
to gain entropy because it means that if you are able
to know anything about either 'x' or 'y' then you are
able to know something about the resulting entropy.

It is the reason our ipv4 routing cache hashes used to
be exploitable.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:47    [W:0.069 / U:2.644 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site