None
The entity that is authorized to use the private key associated with a public key, whether that entity generated the key pair itself or a trusted party generated the key pair for the entity.
Source(s):
NIST SP 800-133
[Superseded]
In asymmetric-key cryptography, the entity that is authorized to use the private key associated with a public key, whether that entity generated the key pair itself, or a trusted party generated the key pair for the entity.
Source(s):
NIST SP 800-133 Rev.1
[Superseded]