Which term describes a fixed-size output produced by a hash function that is used to verify data integrity?

Which term describes a fixed-size output produced by a hash function that is used to verify data integrity?

• A. Hash
• B. Checksum
• C. Cipher
• D. Salt

Answer: (A)

A hash is the fixed-size output produced by a hash function and is used to verify data integrity by comparing it to a previously computed hash. When data is processed, the function yields a digest of a consistent length regardless of input size. By recomputing the hash after transmission or storage and matching it with the original digest, you can quickly detect any tampering or corruption. This fixed-length digest property makes verification efficient, and the deterministic nature ensures the same input always yields the same output, while small changes to the input produce a different hash. Among the options, the hash is the correct term for that fixed-size output used to verify data integrity. A checksum is a simpler error-detection method and isn’t typically produced by a hash function with cryptographic strength. A cipher refers to encryption that transforms data into ciphertext, not an integrity digest. A salt is extra data added to the input to hash to strengthen security, not the output itself.

A hash is the fixed-size output produced by a hash function and is used to verify data integrity by comparing it to a previously computed hash. When data is processed, the function yields a digest of a consistent length regardless of input size. By recomputing the hash after transmission or storage and matching it with the original digest, you can quickly detect any tampering or corruption. This fixed-length digest property makes verification efficient, and the deterministic nature ensures the same input always yields the same output, while small changes to the input produce a different hash. Among the options, the hash is the correct term for that fixed-size output used to verify data integrity. A checksum is a simpler error-detection method and isn’t typically produced by a hash function with cryptographic strength. A cipher refers to encryption that transforms data into ciphertext, not an integrity digest. A salt is extra data added to the input to hash to strengthen security, not the output itself.