Comparison of RSA vs elliptical keys

[Stefan Claas]

Ángel wrote:
 
> On 2020-05-16 at 22:49 +0200, Stefan Claas wrote:
> > out of curiosity, you signed the reply with two sub keys, but
> > what makes the signature so large, the hash algo used? I must
> > admit I have never seen such a large signature before.
> 
> It is quite large, indeed. This Radix 64 block of 12375 bytes contains
> two signatures, of 3857 and 5225 bytes respectively. The first one
> EdDSA (22) and the second a normal RSA one.
> 
> In both cases, most of the signature space is taken by a hashed
> subpacket of type 38. This value is not assigned, but looking at
> https://git.gnupg.org/cgi-bin/gitweb.cgi?p=gnupg.git;a=blob;f=common/openpgpdefs.h#l123
> it is used to store the whole key used.

Interesting, thanks for the explanation!

Regards
Stefan

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