Which security goal is primarily supported by encryption?
Answer
Confidentiality
Explanation
### Why this is right
Encryption makes data unreadable to people who lack the required key, so it primarily supports confidentiality. It does not by itself ensure that systems remain available or that data has not been altered.
### The concept
Confidentiality limits information access to authorized users. Integrity concerns unauthorized changes, and availability concerns access when needed. Different controls address different goals, although a single system may use several controls together.
### The other options
- **B. Availability**: this concerns access to systems and information when needed, not concealment.
- **C. Integrity only**: hashes and signatures help detect change; encryption is principally for confidentiality.
- **D. Nonrepudiation in every case**: encryption alone does not establish this property.
### Remember
Encryption primarily protects secrecy, not uptime.
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