[9681] in cryptography@c2.net mail archive
Re: limits of watermarking (Re: First Steganographic Image in theWild)
daemon@ATHENA.MIT.EDU (Ben Laurie)
Fri Oct 19 15:48:24 2001
Message-ID: <3BD009AE.41FBC9C3@algroup.co.uk>
Date: Fri, 19 Oct 2001 12:08:30 +0100
From: Ben Laurie <ben@algroup.co.uk>
MIME-Version: 1.0
To: Marc Branchaud <marcnarc@rsasecurity.com>
Cc: cryptography <cryptography@wasabisystems.com>
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Marc Branchaud wrote:
>
> This analogy doesn't quite hold.
>
> Copy protection need only be broken once for the protection to be disabled
> for a particular piece of work. Also, once the scheme is known for one piece
> of work, it is extremely easy to break the scheme for other pieces, and in
> particular to write an application that will do so.
>
> With crypto's bar-raising, OTOH, breaking one instance, like an SSL stream or
> an AES key, does not break all other uses of SSL or AES. In particular, SSL
> & AES will provide the same degree of protection for any other communication
> of the same data between the same or other parties. Also, good crypto
> schemes are already widely known and designed explicitly so that knowledge of
> the scheme does not break the scheme.
Although I agree with the general point, I should just mention that if
an SSL break is a break of a private key, then future communications
between the broken party and others may be compromised.
Cheers,
Ben.
--
http://www.apache-ssl.org/ben.html
"There is no limit to what a man can do or how far he can go if he
doesn't mind who gets the credit." - Robert Woodruff
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