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X-rays unfold locked 300-year-old secret letters without opening them

People doubled letters as envelopes to ensure the security of a document, but today we can access them without anyone knowing any better.

Securing Ancient Secrets: The Fascinating History of Letterlocking

Before the invention of envelopes, people would secure their handwritten letters with a curiously complex craft. Welcome to the world of letterlocking!

Is this intricate folding method how European Royals shared their most important secrets?

According to a new article in the Electronic British Library Journal, 16th century royals including Mary Queen of Scots would regularly use spiral letterlocking to send notes securely,

Un algorithme réussit à lire une lettre vieille de 350 ans sans l ouvrir

Un algorithme réussit à lire une lettre vieille de 350 ans sans l ouvrir
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