Uses of Checksum

In the previous lesson, What is Checksum?, we saw the core trick: compute a small fingerprint of the data, then recompute and compare it later to detect corruption. This lesson shows where that trick is actually used. The same idea appears at every layer of a system, from network packets to files on disk.

Verifying Data Sent Over the Network

When data travels across a network, you want to be sure it was not altered or damaged during transmission