“Locked” for 300 years: Virtual unfolding has now revealed this letter’s secrets – Ars Technica

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In 1697, a man named Jacques Sennacque wrote a letter to his cousin, a French merchant named Pierre Le Pers, requesting a certified death certificate for another man named Daniel Le Pers (presumably also a relation). Sennacque sealed the letter with an intricate folding method known as “letterlocking,” a type of physical cryptographythe better to safeguard the contents from prying eyes. That letter was never delivered or opened. More than 300 years later, researchers…

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