What is an example of a Type 1 authentication factor?

A Type 1 authentication factor is something you know, which refers to knowledge-based authentication methods. In this context, a password qualifies as a Type 1 factor because it is a secret that the user creates and must remember — thus, it cannot be shared or easily guessed by others if chosen wisely.

Other options represent different types of factors. A smartcard and a thumbprint are associated with Type 2 authentication factors, which are something you have and something you are, respectively. A retinal scan is also a biometric authentication method, falling under the same Type 2 category. This classification helps in designing more robust security systems by combining different types of factors to establish a clear identity verification process.