Final answer:
The feature of having a key pair burned into a security key that Pablo is researching is known as attestation, which helps verify the legitimacy of the security key.
Step-by-step explanation:
The feature Pablo has been asked to look into, where a key pair is burned into a security key during manufacturing time and is specific to a device model, is known as attestation. This process is used to ensure that the security key is genuine and not tampered with, thereby establishing a chain of trust.
When a security key is used for a service, the service can verify that the key is legitimate by checking the attestation certificate, which was created during the manufacturing process using the unique key pair.
The feature being described in the question is Authentication. Authentication is the process of verifying the identity of a user or a device. In this case, the security key has a key pair that is unique and specific to a device model, which helps verify the authenticity of the device.