A new paper in Nature says they have an algorithm that can read tightly folded letters without opening them physically. The challenge tackled here is to reconstruct the intricate folds, tucks, and slits of unopened letters secured shut with “letterlocking,” a practice—systematized in this paper—which underpinned global communications security for centuries before modern envelopes. It … Continue reading X-Rays Defeat LetterLocking: Expose Secrets of Ancient Folded Papers

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