1. Chris Christensen Department of Mathematics and Statistics Northern Kentucky University

2. CodebookAdditive Book

3. Encipher “U.S. Navy”24396 Additive65358 False sum89644 Transmitted89644 Additive65358 “U.S. Navy”24396 Decipher

4. 67854 59199 76833 57699 10047 70863 06138 27924

6. 48677 26777 66476 09369 47063 29174 67495 14631 05421 75866 32209 56958 57000 99937 63523 31555

7. 3-digit Page Number | 1-digit Row Number | 1 –digit Column Number 02713

9. 67854 59199 76833 57699 10047 70863 06138 27924

11. Is it possible to add two 5-digit numbers that are congruent to 2 modulo 3 and have the sum be a 5-digit number that is congruent to 0 modulo 3?

12. Regular Sum False Sum

13. (Codegroup + Additive) (Codegroup G + Additive) Codegroup – Codegroup G

14. (Codegroup – Codegroup G) + Codegroup G Given these 9 differences Want to construct So that the sum scans

24. Etc.