You might have been using GPG for years.
Do you often send encrypted messages to your friends?
Or maybe you don't even know your friend has a pub key.
If you are new.
There are high-quality documents written by GitHub. Start with this one for example: Generating a new GPG key
Sharing public keys with each other
Using key servers
Find a key on key servers
gpg --search-keys "HackingGate"
List GPG keys associated with
gpg --list-keys [email protected]
Upload a key to a key server
If you want your key available on the key server. Just upload it.
gpg --send-key 85E38F69046B44C1EC9FB07B76D78F0500D026C4
But wait. Not everyone's pub key is available on key servers. You can't make sure keys on key servers are 100% real.
Someone could claim themselves as yourself.
What to do?
Keybase.io came to solve that. They will use additional information such as a tweet, a DNS record, a gist to make sure you are yourself. But still, not everyone is using it. And I don't personally like Keybase.io. Because the setup process will upload your private key by default. It's NOT safe.
GitHub could be the best solution
Almost every developer has a GitHub account. And lots of them using GPG sign their git commits.
URL for GPG pub key
Import a GPG pub key from GitHub user HackingGate (which is me)
curl https://github.com/HackingGate.gpg | gpg --import
gpg --encrypt --sign --armor --recipient [email protected] message.txt
Send the file (or copy text from)
message.txt.asc to the owner of
Only she/he can decrypt the encrypted message.