How does the station-to-station (STS) protocol defend against the intruder-in-the-middle attack in the Diffie-Hellman protocol?

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Answer

Both parties use digital signatures on the exchanged Diffie-Hellman values.

Answer

Both parties hash the exchanged Diffie-Hellman values.

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Both parties encrypt the exchanged Diffie-Hellman values.

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Both parties append a message authentication code to the exchanged Diffie-Hellman values.

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