The Man Who Broke Purple

William Friedman is most famous for breaking Purple, the cipher used by the Japanese in World War Two (hence the name of the book). However, he also played a critical role in saving countless Allied lives in World War One. The British army had decided to use a field code for their army that they thought was unbreakable. Just to make sure, they sent several messages enciphered in the code to Mr. Friedman, who promptly found a major vulnerability in the code’s structure and notified the British just before they put the code into regular use. Stopping the use of the flawed code was undoubtedly a lifesaver for the Allied forces. The excellent book The Man Who Broke Purple discusses this incident and many more in the incredible life of William Friedman. I would highly recommend it.

By Brandon J.

The Man Who Broke Purple

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