The practice of breaking secret codes and encrypted messages without knowing the original key or cipher method.
From Greek 'kryptos' (hidden) + 'analysis' (breaking down), formalized as a term in the early 20th century during wartime codebreaking efforts.
Cryptanalysis during World War II—especially breaking the Enigma code—may have shortened the war by years and literally changed history; today it's the mathematical foundation protecting your passwords and bank data.
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