During WWII, Nazi spies encoded secret messages within fashion illustrations that they then mailed to their superiors. An example of this pre-digital form of steganography is included in British security service files just now made public. From Reuters:
Nazi agents relayed sensitive military information using the dots and dashes of Morse code incorporated in the drawings.
British secret service officials were aware of the ruse and issued censors with a code-breaking guide to intercept them.
The book…included an example of a code hidden in a drawing of three young models.
"Heavy reinforcements for the enemy expected hourly," reads a message disguised as a decorative pattern in the stitching of their gowns, hats and blouses.
