The document discusses checksums and how even small errors can cause visible changes in checksums. A checksum is a numeric value used to verify data integrity. The document contains two identical numbers that are likely checksum values to demonstrate that a checksum can detect even minor changes to data.
Sender calculates the checksum of the data and sends it along with the data to the reciever.
Reciever decodes the checksum and compares it with the orignal data.
If they match data has been transmitted exactly.