Heiko Stamer
Heiko Stamer
I cannot help with code, because I am not familiar with Rust. However, I can answer questions regarding cryptographic background of DSA and ElGamal.
I guess this issue is due to algorithm-specific fields for EdDSA keys (cf. draft RFC 4880bis) that are not supported by pgpdump.
Indeed, that was one of the original ideas for this module of LibTMCG. However, it's a very complex task that takes a lot of time. I already have some code...
Now I can present a piece of free software to you, that can do the 'trick': https://savannah.nongnu.org/projects/dkgpg/ You can meet me at 34C3, if you have any questions on that...
The decryption protocol can be made non-interactive, unfortunately, the signing protocol not. For threshold RSA the situation is better, however it is not implemented yet.
Just one further note: there is also a TCP/IP replacement for GNUnet. Thus a private network between the parties (e.g. torified) will work.
@DemiMarie IMHO one signature is much easier to handle using standard tools. DKGPG has been improved in the last years, e.g. to exchange required messages over Tor network, see https://www.nongnu.org/dkgpg/35c3_slides.pdf