A hash provides a data fingerprint that can be used to check message ____.
Answer
integrity
Explanation
### Why this is right
A hash acts as a fingerprint of data. Comparing a calculated hash with the expected hash can reveal whether the data changed, which is an integrity check.
### The concept
A hash is not encryption because it is not intended to be reversed to recover the original message. It also does not by itself prove who created the data: a digital signature can use a hash and a private key to provide additional evidence of authenticity. The lesson gives a software update hash as an example of an integrity check.
### Terms
- **Hash**: A one-way calculation that creates a compact fingerprint of data.
- **Integrity**: The property that data has not been improperly altered.
- **Digital signature**: A cryptographic value used to verify the origin and integrity of data.
### Remember
A matching hash supports integrity checking; it does not by itself conceal data or identify its sender.
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