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The Evolution of JN-25 and Attacks on It

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Presentation on theme: "The Evolution of JN-25 and Attacks on It"— Presentation transcript:

1 The Evolution of JN-25 and Attacks on It
Chris Christensen Department of Mathematics and Statistics Northern Kentucky University

2 1 June 1939 Codebook

3 1 June 1939 Codebook Additive book

4 JN-25 JN-25B-8 code cipher

5 JN-25 message

6 Encode United States Navy Battleship(s) Ten

7 Additives United States Navy Battleship(s) Ten

8 Encipher United States Navy Battleship(s) Ten

9 Indicator Page 137, line 1 3 x 137 = from 3rd digit Append line 4101 Add key additive th digit? 86683

10 Scanning … …

11 Five-numeral system (Orange Navy)
John Tiltman Agnes Driscoll and Prescott Currier

12 Depth

13 Double repeats Two messages … … … … Possible depth … … … …

14 Differencing (Clear code group 1 + Additive) (Clear codegroup 2 + Additive) Clear codegroup 1 – Clear codegroup 2

15 Differencing Groups in depth Differences

16 Differencing Differences From difference table

17 Differencing

18 15 August 1942 Channel 1 JN-25D10 General purpose system for all naval forces on land and sea. Introduced 15 September Channel 2 JN-25E11 General purpose for system for larger shore bases and all fleet units except submarines. Introduced 1 October Channel 3 JN-25D16-A and JN-25D16-B General purpose system for high command. Introduced 15 September Channel 4 JN-25F10 For auxiliary vessels, minor shore stations, and Resident Naval Officers. Introduced 1 November 1942.

19 Use #1 Use #1 10 x 10 table of additives
15 August 1942 – 14 April 1943 10 x 10 table of additives Group 3 enciphered S/P Group 4 enciphered S/P 3rd from last enciphered E/P 30462

20 Depth 30443 and 30465 30452 and 30471

21 Depth

22 Use #3 Use #3 15 x 12 table of additives
1 December 15 x 12 table of additives Group Group nd from last group Last group 55137

23 Hall’s weights

24 Hall’s weights

25 15 June 1944

26 25 July 1944 N Code Indicators … Group Group 5 3rd from last group nd from last group

27 Nan code additives

28 5 November 1944 Ransuuban 75306

29 20 February 1945 False addition Conversion square 97436

30 Thanks Jared Antrobus Jacob Englert

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