Don’t Forget (Enciphered) Codes

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Presentation transcript:

Don’t Forget (Enciphered) Codes Chris Christensen Northern Kentucky University

Codes

World War I Zimmermann Telegram January 1917 SMS Magdeburg 1914

World War II JN-25 Pearl Harbor 7 December 1941 Battle of Midway 4 – 7 June 1942

Encode

Additives

Additives

Encipher False sum Addition modulo 10

Indicator: Page/row/column 101A 9 pages 27 rows 10 columns

Received Message

Decipher 317D

Depth

Messages in Depth

Depth Possible attacks Brute force determination of possible Additives. Differencing. Known Additives. Known plaintext.

Differencing (Codegroup 1 + Additive) (Codegroup 2 + Additive) Codegroup 1 – Codegroup 2

Differencing Minor difference 2329 e minus the 5554 - 3235

Difference Table

Additive Recovery 5554 + ? = 3486 3486 5554 8732

Text Substitution

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