What type of token-based authentication system uses a challenge/response process?

The correct choice refers to an asynchronous token-based authentication system, which utilizes a challenge/response mechanism as part of its authentication process. In an asynchronous system, the authentication token generated for user verification does not require real-time synchronization with the server. Instead, a unique challenge is presented to the user, who then uses their token to generate a response based on that challenge. This method enhances security by ensuring that the response is valid for that specific challenge only.

Asynchronous systems primarily rely on time-based or event-based tokens where the device generates a token independently, and the server validates it when the user responds. This reduces the risk associated with capturing or replaying static responses, which can be more easily compromised.

The other types of authentication systems such as synchronous and dynamic do not primarily use this challenge/response method. Synchronous systems require direct communication between the token and the server, while static tokens typically work with fixed values without the variability introduced by challenges. Understanding these distinctions is crucial in the context of building secure identity and access management practices.