@aredhel Sorry, it won't decrypt. I don't think unmodified PGP programs are capable of encrypting messages with 16K keys, and it looks like they fail silently. My gpg gets stuck at: gpg: okay, we are the anonymous recipient. gpg: encrypted with RSA key, ID 00000000 So it knows the 16K key was used, but gets stuck after that. I'd like for someone else to build the modified gpg and test it, because all I've proven so far is that my modifications work with my gpg. Also, you can manually remove the version line, or add no-emit-version to your gpg.conf