Cyclic redundancy check (CRC) is a channel coding technique that generates short fixed-digit check codes according to data such as network packets or computer files, and is mainly used to detect or check possible errors after data transmission or storage. It uses the principle of division and remainder to detect errors.

Like other error detection methods, cyclic redundancy check (CRC) forms an n-bit transmission frame T by adding (n-k) redundant bits (also called frame check sequence (FCS)F) after the k-bit data D to be transmitted, and then sends it out.

Extended data

In the process of data transmission, no matter how perfect the design of the transmission system is, there will always be errors, which may lead to the destruction of one or more frames of data transmitted on the link and make the receiver receive the wrong data.

In order to improve the accuracy of the data received by the receiver as much as possible, it is necessary to carry out error detection on the data before the receiver receives it. Only when the detection result is correct can the receiver really accept the data.

There are many detection methods, such as parity check, Internet check and cyclic redundancy check. Cyclic redundancy check is a calculation method used to check the accuracy of digital transmission on communication links.

Baidu encyclopedia -CRC