Certified Information Systems Auditor (CISA) — Question 1454

To confirm integrity for a hashed message, the receiver should use:

Answer options

• A. the same hashing algorithm as the sender's to create a binary image of the file.
• B. a different hashing algorithm from the sender's to create a numerical representation of the file.
• C. a different hashing algorithm from the sender's to create a binary image of the file.
• D. the same hashing algorithm as the sender's to create a numerical representation of the file.

Correct answer: D

Explanation

The correct answer is D because using the same hashing algorithm as the sender ensures that the hash values can be compared directly for integrity verification. Options A, B, and C are incorrect because they either suggest using a different hashing algorithm or incorrectly define how to represent the file, which would not provide a reliable integrity check.