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Re: [openpgp] Proposal for a separable ring signature scheme compatible with RSA, DSA, and ECDSA keys

Werner Koch <wk@gnupg.org> Fri, 14 March 2014 10:01 UTC

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From: Werner Koch <wk@gnupg.org>
To: Vincent Yu <v@v-yu.com>
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Date: Fri, 14 Mar 2014 10:50:14 +0100
In-Reply-To: <80674820640dbeb5ae81f81c67d87541@smtp.hushmail.com> (Vincent Yu's message of "Thu, 13 Mar 2014 17:03:13 -0400")
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Subject: Re: [openpgp] Proposal for a separable ring signature scheme compatible with RSA, DSA, and ECDSA keys
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Hi,

On Thu, 13 Mar 2014 22:03, v@v-yu.com said:

> 3. A new registry of ring signature key-specific algorithm IDs with the 
> following initial values:
>
>      ID   Algorithm
>      --   ---------
>      1  - RSA signing
>      2  - Schnorr signing
>      3  - EC-Schnorr signing

Why do we need a new registry?  I can't see a problem in using the
existing public algorithms ids and declare that only certain algorithms
may be used for ring signatures (i.e. exclude the algo for a ring
signature).

I would also suggest to settle for ECC algorithms and not bother with
RSA or DSA anymore.  

>      (1 octet algorithm ID, 8 octet key ID)

Until a v5 public key packet format has been defined, I would strongly
suggest to use the full SHA-1 fingerprint instead of a key id.  Creating
long key id collisions is quite possible and thus would require extra
code for trial verification.


Salam-Shalom,

   Werner

-- 
Die Gedanken sind frei.  Ausnahmen regelt ein Bundesgesetz.

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