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zypper (and rpm) says: “warning: Unsupported version of key: V3”

Since openSUSE Tumbleweed has been upgraded to use rpm 4.13 (snapshot 2017033), you keep on seeing the message “warning: Unsupported version of key: V3” whenever you invoke zypper or rpm. Of course this is highly annoying, and you just want to stop it, right? First, a bit of background: RPM uses gpg infrastructure to validate […]