Briefly explain the certificate expiration task of the key and certificate life cycle management cancellation phase.
What will be an ideal response?
All certificates are assigned a fixed lifetime at the time of creation. Validity is set according to the issuing CA based on the cryptographic strength of the public/private key pair. One year of validity is common for an end entity certificate. Eventually, the established validity period of a given certificate will expire, and it then enters the cancellation phase. Three different consequences can be applied to a certificate in a cancellation phase:
* No action: The end entity has left the PKI.
* Certificate update: A new key pair (public and private) is generated, and a new certificate is issued to the end entity.
* Certificate renewal: The public key of the original certificate and the corresponding private key are preserved. A new certificate with a new validity period is generated with the same public key. Certificate renewal is used only when the cryptographic strength of the public/private key pair is still sound.
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