Once we start measuring Verity volumes as we activate them we want to include information about the signature keys used, so that we can have distinct ones for confext and for sysext and ther purposes and thus have a cryptograpically protected hint about the kind of image we have activated in the event log. Ideally we'd measure a fingerprint of the signing certificate here, but we don't have that here typically (as PKCS7 signatures used here typically do not embed that), hence use the next best thing: the issuer name and the serial number.
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