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 ...

In a steady, stately script, an anonymous Dutch writer living around 1700 wrote a letter: “I never thought you’d be such a miserable dog,” it went. “If you’ve got something to say, just say it to my ...

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, ...

An Unlocking History Research Group team member holds a rare unopened example of a letterpacket with a paper lock. (Unlocking History Research Group) Hundreds of years ago, before the invention of ...

Letterlocking technologies varied greatly, with people folding and sealing their messages in hundreds of different ways. "They can make it look like it's less secure and have security hidden on the ...

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 ...