Re: XOR and ADD subtil difference ?

From: Arnaud Carré (arnaud.carreNOSPAM_at_freesurf.fr)
Date: 11/30/04 

Date: Tue, 30 Nov 2004 15:49:00 +0100

> > Other: AES uses plenty of XOR like many block cyphers. ( let's say on
> 32bits
> > integer in 32bits implementation). What do you think of the security of
a
> > "modifyed" AES using ADD instead of XOR ??
>
> You mean ADD modulo something? ADD modulo what? ADD modulo 2^32 ?

oh yes sorry I don't specify that. Of course I mean "modulo" add, and modulo
the same size used by any XOR ( with one bit register XOR is equivalent to
ADD).

so in the AES 32bits implementation exemple, of course I speak about
replacing integer 32bits XOR by integer 32bits ADD ( so modulo 2^32 )

And don't be worried, that's not because I don't think XOR is not secure !!
:-) It's just therorical knowledge. I want to know if "modulo add" is as
safe as XOR .

Any idea ?

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