Re: XOR and ADD subtil difference ?

From: Douglas A. Gwyn (DAGwyn_at_null.net)
Date: 11/30/04 

Date: Tue, 30 Nov 2004 09:58:55 -0500

Arnaud Carré wrote:
> :-) It's just therorical knowledge. I want to know if "modulo add" is as
> safe as XOR .

The "safety" of an encryption algorithm is only
loosely connected to the primitive operations used.
There is one advantage of multidigit (carrying)
addition over unidigit addition (including bit XOR),
namely the carries diffuse a small amount of the
information. It's not a large effect but sometimes
it makes the cryptanalysis harder.

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