Question: A server uses a Challenge-Response protocol to authenticate users. The server stores the legitimate users' public key. Each time when a user wants to login,

A server uses a Challenge-Response protocol to authenticate users. The server stores the legitimate users' public key. Each time when a user wants to login, the server generates a random challenge and sends it to the user. The user then generates a digital signature on his/her workstation and sendsthe digital signature to the server. The server authenticates the user by verifying his/her signature on the random message. Describe an attack against the server.

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