<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
Internet packets use a 32-bit checksum.
See also digital signature, cyclic redundancy check.
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checksum » chemist » Chen » CHEOPS