Credential
Taken from the information technology section of the relevant Wikipedia page that describes what a credential is:
Information systems commonly use credentials to control access to information or other resources. The classic combination of a user’s account number or name and a secret password is a widely used example of IT credentials. An increasing number of information systems use other forms of documentation of credentials, such as biometrics (fingerprints, voice recognition, retinal scans), X.509, public key certificates, and so on.