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CompTIA Security+ SY0-701 Practice Question

Which mechanism would most securely facilitate the exchange of encryption keys over a public network?

Elliptic Curve Diffie-Hellman (ECDH)
Hash-Based Message Authentication Code (HMAC)
Remote Access Service (RAS)
Office of Personnel Management (OPM)

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Answer Description

The correct answer is Elliptic Curve Diffie-Hellman (ECDH) because it is a protocol specifically designed to allow two parties to establish a shared secret over an unsecured communication channel. Unlike RSA, which is an asymmetric encryption algorithm not primarily used for key exchange, and HMAC, which stands for Hash-Based Message Authentication Code and is used for ensuring the integrity of the message, ECDH provides a secure method for key exchange that leverages the properties of elliptic curves to enhance security and efficiency.

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What is Elliptic Curve Diffie-Hellman (ECDH)?

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What is the purpose of Hash-Based Message Authentication Code (HMAC)?

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CompTIA Security+ SY0-701

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