Unlocking the Centuries-Old Secrets of Letterlocking
Through the ages, humans have done their best to keep their correspondence sealed and private until it was read by the intended reader: and their eyes only.
letterlocking
The Lost Art of Letterlocking: Tutorials, Personal Experience, and Application in Bookbinding
Nowadays when people talk about communication security, they usually mean computer encryption. The thing about being a bookbinder, though, is that you tend to have a fondness for outdated technology. And before the internet, tracking numbers, and self-sealing envelopes, there was letterlocking.
