apt-key

Key management utility for the APT Package Manager on Debian and Ubuntu. Note: apt-key is now deprecated (except for the use of apt-key del in maintainer scripts). More information: https://manpages.debian.org/latest/apt/apt-key.8.html.

• List trusted keys:
  apt-key list
• Add a key to the trusted keystore:
  apt-key add {{public_key_file.asc}}
• Delete a key from the trusted keystore:
  apt-key del {{key_id}}
• Add a remote key to the trusted keystore:
  wget -qO - {{https://host.tld/filename.key}} | apt-key add -
• Add a key from keyserver with only key id:
  apt-key adv --keyserver {{pgp.mit.edu}} --recv {{KEYID}}