Which of the following is NOT a cryptographic security service?

Which of the following is NOT a cryptographic security service?

• A. Confidentiality
• B. Availability
• C. Integrity
• D. Authentication

Answer: (B)

The choice of "Availability" as the option that is NOT a cryptographic security service is accurate because availability pertains to the accessibility of information and systems when needed, ensuring that authorized users have access to data when required. It is primarily a component of information security focused on system uptime and reliability, rather than a specific service provided by cryptographic techniques. On the other hand, the other options—confidentiality, integrity, and authentication—are fundamental cryptographic services. Confidentiality protects information from unauthorized access, typically through encryption. Integrity ensures that data has not been altered in transit, often employing hash functions to validate the unmodified state of the information. Authentication verifies the identity of users or systems, typically using digital signatures or certificates to establish trust between parties. Overall, while all these services are essential for a comprehensive security posture, availability does not fall within the scope of cryptographic security services, reinforcing why it is the correct answer here.

The choice of "Availability" as the option that is NOT a cryptographic security service is accurate because availability pertains to the accessibility of information and systems when needed, ensuring that authorized users have access to data when required. It is primarily a component of information security focused on system uptime and reliability, rather than a specific service provided by cryptographic techniques.

On the other hand, the other options—confidentiality, integrity, and authentication—are fundamental cryptographic services.

Confidentiality protects information from unauthorized access, typically through encryption. Integrity ensures that data has not been altered in transit, often employing hash functions to validate the unmodified state of the information. Authentication verifies the identity of users or systems, typically using digital signatures or certificates to establish trust between parties.

Overall, while all these services are essential for a comprehensive security posture, availability does not fall within the scope of cryptographic security services, reinforcing why it is the correct answer here.