[lkml]   [2003]   [Aug]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [RFC][PATCH] Make cryptoapi non-optional?
On Fri, Aug 15, 2003 at 12:40:04AM -0700, David S. Miller wrote:
> Andries Brouwer <> 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.

David, did you read this line:

> > Try to put z = x xor y and apply your insight to the strings x and z.

Let us do it. Let z be an abbreviation for x xor y.

The lemma that you believe in, applied to x and z, says

entropy(x) >= entropy(x xor z)
entropy(z) >= entropy(x xor z)

But x xor z equals y, so you believe for arbitrary strings x and y that

entropy(x) >= entropy(y)
entropy(x xor y) >= entropy(y).

This "lemma", formulated in this generality, is just plain nonsense.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:47    [W:0.115 / U:2.104 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site