Virtual Labs

Experiment 10: Elliptic-curve Diffie–Hellman (ECDH) Key Exchange Protocol

What is the purpose of the Elliptic-curve Diffie–Hellman (ECDH) Key Exchange Protocol?

a: To encrypt data during transmission. Explanation

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b: To establish a shared secret key between two parties over an insecure communication channel. Explanation

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c: To authenticate users in a network. Explanation

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d: To compress data before transmission. Explanation

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How is User A's public key calculated in the ECDH Key Exchange Protocol?

a: By adding User A's private key to a fixed constant. Explanation

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b: By multiplying User A's private key with a generator point on the elliptic curve (G). Explanation

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c: By subtracting User A's private key from a random number. Explanation

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d: By dividing User A's private key by a prime number (n). Explanation

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Why is it important for the private keys (nA and nB) to be chosen such that (nA < n) and (nB < n) in ECDH Key Exchange?

a: To speed up the key exchange process. Explanation

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b: To ensure that the public keys are small and easy to compute. Explanation

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c: To prevent potential vulnerabilities and ensure security. Explanation

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d: To reduce the computational load on the elliptic curve generator. Explanation

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The main purpose of ECDH is:

a: Encrypt messages directly Explanation

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b: Exchange a shared secret securely Explanation

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c: Generate digital signatures Explanation

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d: Compress data Explanation

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In ECDH, the shared secret is derived from:

a: Both parties’ private keys Explanation

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b: Both parties’ public keys Explanation

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c: One party’s private key and the other’s public key Explanation

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d: Only a pre-shared key Explanation

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Advantages of using elliptic curves over classic Diffie–Hellman include:

a: Smaller key size Explanation

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b: Faster computation Explanation

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c: Reduced resource usage Explanation

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d: All of the above Explanation

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