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Historically speaking there have been numerous stego technique usage examples throughout history. Which of these was used by the Germans during World War II?
Stego text
Microdots
Sign language
Morse code
The first use of microdots was found to be on an envelope carried by German spy in 1941 the information in the dot was not encrypted and could be viewed. They were able to create an extremely small photograph which was included in information the size of a period of a sentence.
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