"pocked" - 1 õppematerjal

TheCodeBreakers

I wouldn't say one came before the other—they were so close together you couldn't separate them." Though the work on both was substantially t complete by about 1944, he continued polishing them until heir publication as separate papers in the abstruse Bell System Technical Journal in 1948 and 1949. Both articles—"A Mathematical Theory of Communica-|tion" and "Communication Theory of Secrecy Systems"— present their ideas in densely mathematical form, pocked vith phrases like "this inverse must exist uniquely" and  expressions like "T^RjCTkR,)-1"^!^." But Shannon's terse and incisive style breathes life into them. The first paper gave birth to information theory; the second dealt with cryptology in information-theory terms. Chief among their new concepts is that of redundancy. Redundancy retains, in information theory, the essence of its lay meaning of needless excess, but it is refined and extended. Roughly, redundancy means that