A hash is a mathematical algorithm that helps assure which aspect of the CIA Triad?

A hash is a mathematical algorithm that helps assure the "Integrity" aspect of the CIA Triad.

Here's a step-by-step explanation:

1. The CIA Triad stands for Confidentiality, Integrity, and Availability. It's a model designed to guide policies for information security within an organization.

2. The "Integrity" aspect of the CIA Triad ensures that data is accurate and unchanged during its lifecycle. It prevents unauthorized users from making modifications.

3. A hash function plays a crucial role in maintaining this integrity. When data is input into a hash function, it produces a fixed-size string of bytes, typically a 'digest'.

4. This digest is unique to the input data - even a small change in the input will produce a significantly different digest.

5. When the data is retrieved, the hash function is run again, and the digest is compared to the original. If they match, the data has maintained its integrity. If they don't match, it indicates that the data has been tampered with.

So, in summary, a hash is a mathematical algorithm that helps assure the integrity of data by detecting any changes or tampering.