Infrastructure support for GnuPG post-quantum keys

[have at anonymous.sex]

On Mon, 6 Jan 2025 10:53:43 +0100, Vincent Breitmoser 
<look at my.amazin.horse> wrote:

>...do you think PQC-sized public keys might become a challenge?

I attached to my prior list message the same PQC key that was rejected 
by keys.openpgp.org when I tried to upload it.  It’s 3106 bytes, 
ASCII-armored.

PQ keys with SPHINCS+ signatures (SLH-DSA, FIPS-205) will obviously be 
much bigger, not to mention PQ keys with a Classic McEliece encryption 
subkey if we could please get that wired in from the libgcrypt support 
added last year.  (Pretty please?)  I know that *you* know the 
difference between that and a little lettuce 🥬,[0] but other -users 
members may not.

I’ve been trying to figure out some hackish workarounds for the 
potential sizes of such keys.  It’s off-topic for -users, and not ready 
yet; anyone who is interested now may contact me off-list, preferably 
using PQ-PGP.

[0] Apologies to non-English speakers.  I stole the lettuce/lattice joke 
from some cryptography talk I saw somewhere, where the presenter made 
the same apology.

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