ITPEC IP April 2018 Question 37

Topic: Security

Among the descriptions A through C below concerning information security measures, which of the following is the list that contains all and only the goals that can be achieved by encrypting communication content?

A:Recovering the data that is tampered with during communicationB:Ensuring that the communication content is not disclosed to a third partyC:Identifying the person involved in tapping if tapping has occurred

Explanation

B only — encryption keeps the content from being read by a third party.

Encrypted data can still be intercepted, but without the key it cannot be understood. That protects confidentiality.

  • •A Encryption cannot restore data altered on the way. Tampering is detected with a message digest or digital signature, and the data is then sent again.
  • •B Keeping the content from being disclosed to a third party is exactly what encryption achieves.
  • •C Encryption leaves no trace of who intercepted the data, so it cannot identify the eavesdropper.

Answer (d)

Why not others:

  • •(a) A — encryption does not recover tampered data
  • •(b) A, B — includes A
  • •(c) A, C — neither A nor C is achieved, and B, the actual goal, is left out

Key rule: Encryption provides confidentiality; detecting tampering needs a hash or digital signature, and restoring data needs retransmission or a backup.

Security · AI-written, may contain errors

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