debian-archive-keyring is a package containing GnuPG archive keys of the Debian archive. New GPG-keys are being constantly added with every new Debian release.
For Debian 8 Jessie, GPG-keys for 10/buster and 11/bullseye Debian release are added in the version 2017.5~deb8u2.
For Debian 8 jessie, these problems have been fixed in version 2017.5~deb8u2.
We recommend that you upgrade your debian-archive-keyring packages.
Further information about Extended LTS security advisories can be found in the dedicated section of our website.