Invisible ink Quote by David Kahn
““Another steganographic system was still in use in the 20th century: Aeneas suggested pricking holes in a book or other document above or below the letters of the secret message. German spies used this very system in World War I, and used it with a slight modification in World War II—dotting the letters of newspapers with invisible ink.””
About This Quote
Source Book: The Codebreakers by David Kahn, 1967
Historical steganography used physical modifications to texts to hide messages, later adapted with invisible ink.
In simple terms: Old methods hid secrets in books; later ink made them invisible.
Key Takeaway
Explore hidden communication methods.
Themes
history
cryptography
espionage
technique
innovation
Mood
intriguing
historical
analytical
Type
informative
educational
When to use this quote
- World War I espionage
- World War II espionage
- modern digital steganography
- educational workshops
Key Concepts
Steganography
covert communication
physical encoding
Questions to Reflect On
- How might modern tech improve or replace these methods?
- What ethical concerns arise from hidden communications?
A Different Perspective
Physical methods are limited by material durability and detection risk.
![“The technique was at least moderately well known, for Ibn Khaldūn wrote in The Muqaddimah: “Occasionally, skillful secretaries, though not the first to invent a code [and with no previous knowledge of it], nonetheless find rules [for solving it] through combinations which they evolve for the…” quote by David Kahn](https://sms4smile.com/quotes/img-quotes/1d1/david-kahn-13896_programming_the-technique-was-at-least-moderately-we_657231.jpg)
