Chris Christensen Department of Mathematics and Statistics Northern Kentucky University.

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Chris Christensen Northern Kentucky University.

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Chris Christensen Department of Mathematics and Statistics Northern Kentucky University.

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Chris Christensen Department of Mathematics and Statistics Northern Kentucky University

CodebookAdditive Book

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

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

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?

Regular Sum False Sum

(Codegroup + Additive) (Codegroup G + Additive) Codegroup – Codegroup G

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

Etc.