SY0-501 Question #537: Real Exam Question with Answer & Explanation

Question

When sending messages using symmetric encryption, which of the following must happen FIRST?

Options

• AExchange encryption key
• BEstablish digital signatures
• CAgree on an encryption method
• DInstall digital certificates

Explanation

When utilizing symmetric encryption for message transmission, the initial and most fundamental step is for both communicating parties to mutually agree upon the specific encryption algorithm or method to be used.

Common mistakes.

• A. Exchanging the encryption key must happen after an encryption method has been agreed upon, as the key's properties and usage are determined by the chosen algorithm.
• B. Establishing digital signatures provides authenticity and integrity, which is a separate cryptographic goal from the confidentiality offered by symmetric encryption and is not a prerequisite for it.
• D. Installing digital certificates is primarily associated with public key infrastructure (PKI) and asymmetric encryption for identity verification or secure key exchange, not as the direct first step for symmetric encryption itself.

Concept tested. Symmetric encryption process prerequisites

Reference. https://learn.microsoft.com/en-us/windows/win32/seccrypto/symmetric-encryption

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