Authentication Mechanisms in Cryptography

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Q: Ned is a Network Administrator. Ned notices that the wireless AP sends 128 bytes of plaintext, and a station responds by encrypting it. The station then transmits the encrypted ciphertext using an identical key and cipher to that utilized by WEP to encrypt future network traffic. What kind of authentication mechanism is being used?

a. Open system authentication

b. Pre-shared key authentication

c. Single key authentication

d. Shared key authentication

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