Linux: gnupg2
GPG: GnuPG(GNU Privacy Guard), GnuPG is an Open Source alternative to the well-know Pretty Good Privacy(PGP).
dirmngr: 管理 CRL & OCSP 配置文件 /root/.gnupg/dirmngr.conf


gpg -v --keyserver hkp://keyserver.ubuntu.com --recv-keys 3A79BD29
gpg --armor --export 859BE8D7C586F538430B19C2467B942D3A79BD29 | apt-key add -

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