Question 86

A hash provides integrity.

A hash function ensures that data has not been altered or tampered with, thereby providing data integrity. This is crucial in verifying the authenticity of information over time.

A) Non-repudiation

Non-repudiation refers to the assurance that someone cannot deny the validity of their signature or the sending of a message. While hashes can support non-repudiation in certain contexts, such as digital signatures, they do not inherently provide this feature on their own.

B) Integrity

Integrity is one of the primary functions of a hash. It allows users to verify that the data remains unchanged from its original state, making it essential for ensuring data accuracy and reliability.

C) Confidentiality

Confidentiality is the principle of keeping sensitive information secret from unauthorized access. Hash functions do not provide confidentiality, as they do not encrypt data; instead, they generate a fixed-size string from input data that can be publicly shared.

D) Availability

Availability refers to ensuring that information is accessible when needed. Hash functions do not directly contribute to availability, as they focus on data integrity rather than ensuring that data is readily accessible to users.

Conclusion

The correct answer is that a hash provides integrity, as it is designed to ensure that data remains unaltered. Other options, such as non-repudiation, confidentiality, and availability, do not accurately reflect the primary purpose of a hash function, which is to maintain the integrity of the data.