Certified Information Systems Auditor (CISA) — Question 484

A characteristic of a digital signature is that it:

Answer options

• A. is under control of the receiver.
• B. is unique to the message.
• C. has a reproducible hashing algorithm.
• D. is validated when data are changed.

Correct answer: B

Explanation

The correct answer is B, as a digital signature is designed to be unique to each message, ensuring authenticity and integrity. Option A is incorrect because the control of the signature lies with the sender, not the receiver. Option C is misleading; while hashing algorithms can be consistent, it doesn't define the characteristic of a digital signature. Option D is false because a digital signature is invalidated if data are changed.