this post was submitted on 19 Jul 2023

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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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[–] Akasazh@feddit.nl 1 points 1 year ago

Aside from the answers already given, the were ways of folding letters that were tamper proof, destructive in opening, called letter locking.

Here's an article on the prachtige: https://arstechnica.com/science/2021/03/locked-for-300-years-virtual-unfolding-has-now-revealed-this-letters-secrets/