SY0-501 Question #521: Real Exam Question with Answer & Explanation

Question

Two users must encrypt and transmit large amount of data between them. Which of the following should they use to encrypt and transmit the data?

Options

• ASymmetric algorithm
• BHash function
• CDigital signature
• DObfuscation

Explanation

When encrypting large amounts of data for transmission, symmetric encryption is the preferred method due to its speed and efficiency compared to asymmetric alternatives.

Common mistakes.

• B. Hash functions are one-way mathematical operations used to verify data integrity, not to encrypt and decrypt data - they cannot be reversed to recover the original plaintext.
• C. Digital signatures use asymmetric cryptography to verify the authenticity and integrity of a message, but they do not encrypt the data payload itself for confidentiality.
• D. Obfuscation merely makes data harder to read or understand (e.g., encoding or scrambling), but it does not provide true cryptographic security or a key-based mechanism for secure decryption.

Concept tested. Symmetric encryption for bulk data transmission

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

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