KEY MIGRATION BRINGS WITH IT ONE OF THE LARGEST DISRUPTIONS A CRYPTOGRAPHIC ESTATE HAS TO DEAL WITH.
The translation of a key from under one master key to another causes significant upheaval to those applications and services that depend on the availability of the keys.
Migration can be forced on an organisation when its master keys are compromised, when a service provider is changed or as in the case of the 2019 Key Block Mandate, when the standards adhered to change the way an organisation protects keys to be used on a specified service.