Greece was organized into small, disunited, independent city-states. ... The apparently blank tablets got to Greece, where they realized (how? ...
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3 week summer course
In the 16th century, the Italian scientist Giovanni Porta described how to conceal a message in a hardboiled egg by making ink from alum and vinegar and writing on the shell. The solution penetrates the shell, leaving its mark only on the egg underneath!
During WWII, German agents in Latin America would photographically shrink down a page of text to a little dot, and hide it on top of a period or dotted I on a page. A tip-off allowed American agents to find this in 1941.
With the advent of photography, microfilm was created as a way to store a large amount of information in a very small space. In both world wars, the Germans used "microdots" to hide information, a technique which J. Edgar Hoover called "the enemy\'s masterpiece of espionage." A secret message was photographed, reduced to the size of a printed period, then pasted into an innocuous cover message, magazine, or newspaper. The Americans caught on only when tipped by a double agent: "Watch out for the dots -- lots and lots of little dots."
To an untrained eye you\'re sending a completely innocuous picture!
Look at the steganography software at
Steganography suffers from one problem: if it is uncovered all is lost.
If we hide the message but then make it difficult to read if found, we have an added level of security.
The aim is to hide the meaning of the message rather than its presence. This can be done by scrambling the letters around.