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Which answer is not true for Diffie-Hellman algorithm?A. Security stems from the difficulty of calculating the product of two large prime numbers.B. It was the first public key exchange algorithm.C. It is vulnerable to man-in-the-middle attacks.D. It is used for distribution of a shared key, not for message encryption and decryption.

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Answer: The correct answer is letter D.

Explanation: Diffie–Hellman is used to secure some internet services. It can secure encrypted communication between two parties required, the first exchange keys by some secure physical channel. It is not secure, it can be vulnerable to man-in-the-middle attacks.

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