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A paper lock kept secret letters safe from prying eyes
Fact of the week
15 April 2024
A paper lock kept secret letters safe from prying eyes
Imagine it's the late 16th century. You're an English spy in Venice, and you have a secret message for the Queen. It will take weeks for a letter to reach London by sea and land. Sealed envelopes don't exist yet. So, how can you be sure no one will read your message before it arrives?
![](https://usborne.com/media/catalog/product/cache/cb8a45d771c081dc6d7e3e5dd1ed195e/9/7/9781805317869_cover_image.jpg)
Find out more in:
100 Things to Know About the Unknown
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