_FLETCHER'S CHECKSUM_
by John Kodis
Example 1:
(a)
integer i, sum1, sum2;
sum1 = 0;
sum2 = 0;
for i from 1 to message_length do
sum1 = ( sum1 + message[i] ) modulo 255;
sum2 = ( sum2 + sum1 ) modulo 255;
end for.
(b)
check1 = 255 - (( sum1 + sum2 ) modulo 255);
message[message_length+1] = ...
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