Common ones are CRC-8, CRC-16, and CRC-32. There are different kinds of CRCs that vary in their bit size. In this article, we will solely focus on the implementation of a CRC algorithm in Swift. But if you want to take a deep dive, we’ve got another article for you which covers all the theory and explains in detail how a CRC works. Understanding the maths behind the CRC is a little challenging. It enables us to detect any unwanted changes in the transmitted or stored data. CRC is like a checksum that is appended to the data. The most common way is called Cyclic Redundancy Check (CRC).
We need a mechanism to validate the integrity of the data. In such cases, we need to make sure that the data we receive (or read) is the same data that was sent (or written). When working with any communication or storage medium such as Bluetooth, wi-fi (and even wired networks) or disk storage, data can get corrupted.
