Description: The cyclic redundancy check, or CRC, is a technique for detecting errors in digital
data, but not for making corrections when errors are detected. It is used primarily
in data transmission. In the CRC method, a certain number of check bits, often
called a checksum, are appended to the message being transmitted. The receiver
can determine whether or not the check bits agree with the data, to ascertain with
a certain degree of probability whether or not an error occurred in transmission. If
an error occurred, the receiver sends a “negative acknowledgement” (NAK) back
to the sender, requesting that the message be retransmitted
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