Final answer:
The form of authentication described in the question is called knowledge-based authentication. It involves the supplicant proving their identity by demonstrating knowledge of specific information that only the true party should know.
Step-by-step explanation:
The form of authentication described in the question is called knowledge-based authentication. This method involves the supplicant proving their identity by demonstrating knowledge of specific information that only the true party should know. It typically involves the use of passwords or secret questions.
For example, when logging into an online account, the user may be asked to provide their password, which is something only they should know. If the correct password is provided, the authentication is successful.
Knowledge-based authentication is commonly used in various systems and platforms to ensure the security and privacy of users' information.