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IANA operation details on the root key ceremonies and procedures are at https://www.iana.org/dnssec
You may be interested by section ยง4.2.2 of https://www.iana.org/dnssec/dps/ksk-operator/ksk-dps.txt
Access to and management of cryptographic hardware is based on the
principle of successive barriers in three tiers, requiring at least
seven trusted ...
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