None
Credentials that are bound to a subscriber in a manner than can be modified without invalidating the credential.
Source(s):
NIST SP 800-63-3
Credentials that describe the binding between a user and token in a manner than can be modified without invalidating the credential. (For more discussion, see Section 7.1.1.)
Source(s):
NIST SP 800-63-2
[Superseded]