noun checksum a digit representing the number of bits of information transmitted, attached to the end of a message in order to verify the integrity of data 3
noun checksum A digit representing the sum of the correct digits in a piece of stored or transmitted digital data, against which later comparisons can be made to detect errors in the data. 1
noun Technical meaning of checksum (storage, communications) A computed value which depends on the contents of a block of data and which is transmitted or stored along with the data in order to detect corruption of the data. The receiving system recomputes the checksum based upon the received data and compares this value with the one sent with the data. If the two values are the same, the receiver has some confidence that the data was received correctly. The checksum may be 8 bits (modulo 256 sum), 16, 32, or some other size. It is computed by summing the bytes or words of the data block ignoring overflow. The checksum may be negated so that the total of the data words plus the checksum is zero. See also digital signature, cyclic redundancy check. 1
noun checksum a number, derived by applying a suitable algorithm to some data, used to check whether errors have occurred in transmission, storage or data entry. 0
