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jaimeastorga2000 comments on Harry Potter and the Methods of Rationality discussion thread, part 6 - Less Wrong
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In Order of the Phoenix, Sirius Black seems to know that codes exist, at least. Although he dismisses them as "breakable" and decides to communicate over a floo network connection instead (which makes me wonder if wizards know about one-time pads, and if there are any spells which can break them).
Given that the magical community didn't seem to get into mathematics much, and provably strong crypto needs a ton of math, I could see how they never went beyond Caesar Ciphers.