Archived posting to the Leica Users Group, 1999/10/14

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]
Subject: Re: [Leica] Film/Digital
From: "Anthony Atkielski" <anthony@atkielski.com>
Date: Thu, 14 Oct 1999 20:00:23 +0200
 
From: Johnny Deadman <deadman@jukebox.demon.co.uk>
Sent: Thursday, October 14, 1999 12:12
Subject: [Leica] Film/Digital


> Finally, piracy is already a nightmare, and Anthony
> is wrong to imply that signing a digital image guarantees
> copy protection.

Anthony never implied that; you inferred it.

Digital signatures provide proof of (1) authenticity (definite origin from a
given source) and (2) integrity (no modification).  It is useless for copy
protection, which requires other closely-related but not-quite-the-same
techniques (still cryptographic, though).

  -- Anthony