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300-730 · Question #70
300-730 Question #70: Real Exam Question with Answer & Explanation
The correct answer is B: ECDHE. ECDHE uses elliptic curve mathematics to perform an ephemeral Diffie-Hellman key exchange, while the other options serve signing, encryption, or hashing purposes.
Question
What uses an Elliptic Curve key exchange algorithm?
Options
- AECDSA
- BECDHE
- CAES-GCM
- DSHA
Explanation
ECDHE uses elliptic curve mathematics to perform an ephemeral Diffie-Hellman key exchange, while the other options serve signing, encryption, or hashing purposes.
Common mistakes.
- A. ECDSA (Elliptic Curve Digital Signature Algorithm) uses elliptic curves for digital signatures and authentication, not for key exchange.
- C. AES-GCM is a symmetric block cipher mode used for bulk data encryption and authenticated encryption, not a key exchange algorithm.
- D. SHA (Secure Hash Algorithm) is a cryptographic hash function used for data integrity verification and digital signatures, not key exchange.
Concept tested. Elliptic Curve Diffie-Hellman Ephemeral key exchange
Reference. https://learn.microsoft.com/en-us/windows/win32/seccng/elliptic-curve-diffie-hellman
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