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

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

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,

Scientists read 300-year-old sealed letter without opening it "Virtual unfolding" allows researchers to look inside intricately folded historical letters without damaging them. Scientists are using technology to read centuries-old letters sealed using "letterlocking." Nature Communications In a letter, dated July 31, 1697, Jacques Sennacques asks his cousin Pierre Le Pers, a French merchant in The Hague, for a certified copy of a death notice for Daniel Le Pers. That's no revelatory request by any means, but for the past 300 years, the lette...

Scientists read 300-year-old letters without opening them • 7 min read Catch up on the developing stories making headlines.STOCK/Getty Images Unopened letters more than 300 years old that were folded using mysterious techniques have now been read for the first time without opening them, a new study finds. For centuries, before mass-produced envelopes started proliferating in the 1830s, most letters across the globe were sent using letterlocking, a method of folding letters to become their own envelopes. These intricate techniques also often served to help recipients detect if mail had been ...