Consider the following statements with respect to network security: (a)…
2019
Consider the following statements with respect to network security:
(a) Message confidentiality means that the sender and the receiver expect privacy
(b) Message integrity means that the data must arrive at the receiver exactly as they were sent.
(c) Message authentication means the receiver is ensured that the message is coming from the intended sender
Which of the statements is (are) correct?
- A.
Only (a) and (b)
- B.
Only (a) and (c)
- C.
Only (b) and (c)
- D.
(a), (b) and (c)
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Correct answer: D
Answer: All three statements are correct.
Explanation: each statement describes a standard security property.
Message confidentiality: Only authorized parties (the sender and intended receiver) can read the message; this is typically achieved with encryption to provide privacy.
Message integrity: The data must arrive at the receiver exactly as they were sent, or any modification must be detectable; common mechanisms include cryptographic hashes, message authentication codes, and digital signatures.
Message authentication: The receiver is assured the message comes from the intended sender; achieved using shared keys, digital signatures, or certificates that bind identity to messages.
Because each statement correctly defines one of these distinct security goals, the correct answer includes all three statements.
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