The challenge-response authentication mechanism is a security protocol that verifies the identity of a user or system. It operates by requiring the user to provide a response to a challenge posed by the system. The challenge is typically a random string of characters generated by the system and sent to the user. The user then computes a response based on the challenge and a secret key known only to the user and the system. If the response matches the expected value, the user is authenticated and granted access. This mechanism is commonly used in various applications, including online banking, email services, and network security systems. The specific features of this method that contribute to its enhanced security in comparison to a conventional password-based approach are not readily appare

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