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how did military commanders in olden times send instructions across hundreds of miles without concern of forgery or interception? (lemmy.world)

submitted 1 year ago by Jackcooper@lemmy.world to c/asklemmy@lemmy.ml

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Let me know if there is a better community for this type of question. I am still learning my way around.

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[–] Delphia@lemmy.world 21 points 1 year ago

Nobody else has mentioned deliberate obfuscation techniques.

For example, if you're sending field commanders instructions in writing, you brief them in advance that if you use certain codewords, modify certain data. I.e if you use the word "glorious" to describe reinforcement troops, double the number. If you describe them as "experienced" halve the number.

So if the letter does fall into enemy hands, the data will be wrong.