The task of key management is the complete set of operations necessary to create, maintain, protect, and control the use of cryptographic keys. Keys have a life cycle; they’re created, live useful lives, and are retired. The typical encryption key lifecycle likely includes the following phases:
Defining and enforcing encryption key management policies affects every stage of the key management life cycle. Each encryption key or group of keys needs to be governed by an individual key usage policy defining which device, group of devices, or types of application can request it, and what operations that device or application can perform — for example, encrypt, decrypt, or sign. In addition, encryption key management policy may dictate additional requirements for higher levels of authorization in the key management process to release a key after it has been requested or to recover the key in case of loss.
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