Question 44

Question

Question 44

BlackTom AI · Accepted Answer

Authentication verifies identity: proving a user is who they claim to be.

1) Relevant knowledge points and concepts
- Authentication: the process of verifying an identity (passwords, PINs, biometrics, multi-factor).
- Authorization: determining what an authenticated user is allowed to do (permissions, access control).
- Encryption: transforming data to protect confidentiality during storage or transmission.
- Backup/availability: creating copies to recover from failures or data loss.

2) Step-by-step reasoning
- Read each option and map it to the security concept:
  a. "Making a backup copy of a system in case of failure" → this maps to backup and availability, not authentication.
  b. "Proving that a user is really who they claim to be" → directly defines authentication.
  c. "Deciding what actions a user is allowed to perform after logging in" → this is authorization (access control), which comes after authentication.
  d. "Encrypting data so that no one can read it during transmission" → this describes encryption for confidentiality, not identity verification.

3) Calculations / intermediate steps
- No numerical calculation is required. The logical mapping above is the intermediate reasoning showing how each option aligns with core security concepts.

4) Why the correct answer is correct
- Authentication’s core purpose is identity verification. Techniques like passwords, tokens, and biometric checks are explicitly used to prove a claimed identity, matching option b exactly.

5) Why the other options are incorrect (brief)
- a is about backups/availability, unrelated to identity verification.
- c describes authorization (post-authentication permission assignment), not authentication itself.
- d describes encryption and confidentiality, which protects data, not user identity.

6) Conclusion
- Therefore, the correct answer is b. Proving that a user is really who they claim to be matches the definition of authentication and confirms the provided answer.

Question 44单项选择题

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