The validity period for the RRSIGs covering the DS RR for a zones delegated children must be no less than two days and no more than one week.

Description

<VulnDiscussion>The best way for a zone administrator to minimize the impact of a key compromise is by limiting the validity period of RRSIGs in the zone and in the parent zone. This strategy limits the time during which an attacker can take advantage of a compromised key to forge responses. An attacker that has compromised a ZSK can use that key only during the KSK's signature validity interval. An attacker that has compromised a KSK can use that key for only as long as the signature interval of the RRSIG covering the DS RR in the delegating parent. These validity periods must be short, which will require frequent resigning. To prevent the impact of a compromised KSK, a delegating parent must set the signature validity period for RRSIGs covering DS RRs in the range of a few days to one week. This resigning does not require frequent rollover of the parent's ZSK, but scheduled ZSK rollover must still be performed at regular intervals.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>