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  DSC03902.JPG - ...and the famous Vigenère square from the 16th century, which delivered nearly unbreakable code (but needed the same secret password for the sender and receiver). Babbage is reported having cracked this code.  
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...and the famous Vigenère square from the 16th century, which delivered nearly unbreakable code (but needed the same secret password for the sender and receiver). Babbage is reported having cracked this code. Download
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