Hundreds of years ago, people developed ingenious methods to secure their letters from prying eyes – and they did it with only paper, adhesive and folds. Late at night on 8 February 1587, an ...

Mary, Queen of Scots used a “spiral locking” technique to seal the last letter she wrote before her execution, indicating that she wanted the contents to remain secret, according to research published ...

Over recent years we’ve been treated to a series of fascinating advances in the world of x-ray imaging, as researchers have developed their x-ray microtomography techniques and equipment to the point ...

Centuries before encrypted texts and secure video conferencing, people relied on physical engineering to keep their written messages sturdy, sealed, and secure against eavesdroppers. In a new book, ...

The researchers virtually opened the letters with an advanced X-ray machine. They then used computers to analyze the folds and create a readable, digital model of the unfolded message. Unlocking ...

Keys: How to Use this Book -- Introduction to Letterlocking -- Building the Story of Letterlocking -- Reading Letterlocking Features -- Locking Mechanisms, Security, and Authentication -- Distinctive ...