DSA = DSS?

[John Bacalle]

On Fri, Aug 11, 2000 at 06:37:14AM -0700, L. Sassaman wrote:
> On Fri, 11 Aug 2000, John Bacalle wrote:
-snip GnuPG/PGP can exchange DSA/DSS messages?-
> For some reason, the encryption subkey in PGP is called "DH". It's really
> ElGamal Encryption (ELG-E). 

> The [digital signature] algorithm used in PGP is DSA, [the]
> hash is SHA-1.

(Thanks to Werner and yourself I have a better understanding of things
now. Much gratitude! I need to explicitly clarify, though.)

So, if PGP does DSA-SHA1 (but, calls it DSS - fine), and GnuPG does the
same (it's the default --gen-key option afterall), therefore both can fully
inter-operate in this pubkey format? 

Ditto ELG-E/DH?

> [To GPG<->PGP] just disable that ELG support, and add the RSA and IDEA
> modules (provided it's leagal where you are).

OK.

[Recapping]

   		GnuPG		PGP
   		-----		---

(DSA/DSS)SHA1	  Y		 Y

ELG-E/DH	  Y		 Y

ELG		  Y		 N

RSA		  N*		 Y

IDEA		  N*		 Y

* It is Y(es) if the module/patch available is applied. 

I am already aware that GnuPG can do RSA (although can it also generate
RSA keys after patching?), but rather I was more wondering how firm was the
inter-operation of the newer pubkey/signkey formats between the two
applications? 

Thus, it appears to me at this point that if I use the default GnuPG
--gen-key option (DSA + ELG-E w/SHA1) I will be just fine communicating
with PGP 5/6 users. 

   John

-- 
John Bacalle

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