how long will GAK licensing remain `voluntary' (Re: UK crypto policy announcement today at 3:30pm)

[Neil Dunbar]

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Adam Back wrote:

> PGP 2.x does, and some others also -- this could be used as a
> technical argument against the GAK voluntary licensing nonsense --
> from a licensed TTPs point of view:
>
>   we use one key for both signing and encrypting, if we store private
>   encryption key, we have also store private signature key, because it
>   is the same key, and now we have diminished the value of signatures
>   because they can be forged.

You haven't diminished its value - you've wrecked it. By definition,
you have lost the ability to say "only I could have signed this document,
because only I have the private key".

Furthermore, the EU directive on digital sigs state that the
private component of a signature key must *not* be escrowed,
otherwise the signature will have no legal binding (cf
Article 2 [Definition] para 1.(c) & Article 5 [Requirements]
para 1(c)).

Neil

--
------------------------------
Name: Neil Dunbar   Email: nd@hplb.hpl.hp.com
Address: HP Laboratories, Filton Road, Stoke Gifford, Bristol BS12 6QZ
Tel: +44 (0) 117 922 9471   Fax: +44 (0) 117 922 9742
 "If I could choose the life I lead, then I would be a spaceman..."
-- Opinion's are the author's own, not HPs --



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