Data encryption keys should be updated on a regular basis.
2.
Public ephemeral key agreement key : Public ephemeral key agreement keys are the public keys of asymmetric key pairs that are used in a single key establishment transaction to establish one or more keys ( e . g ., key wrapping keys, data encryption keys, or MAC keys ) and, optionally, other keying material ( e . g ., Initialization Vectors ).
3.
Private ephemeral key agreement key : Private "'ephemeral key "'agreement keys are the private keys of asymmetric key pairs that are used only once to establish one or more keys ( e . g ., key wrapping keys, data encryption keys, or MAC keys ) and, optionally, other keying material ( e . g ., Initialization Vectors ).
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