This brings back memories when I participated in the same although I didn't join for merit/s but to have some experience/knowledge and having fun. So the goal is to encrypt a message that only you can decrypt and in order to do that js to use your pgp public key where you have the private one which is used to decrypt what's been encrypted using your public key. I am s little bit confused as to why there's a signed message in OP. Is it another task (fun/blast from the past) if I call it?.