In our modern world, governments and universities have top mathematicians developing encryption algorithms for storing or transmitting sensitive or classified data on computers.  
    The Incas had something similar.  While they had no known written language,  the priests and nobles and merchants could send messages and keep records.  They did this with quipas.  It’s a bundle of colored threads or chords of various lengths.  The colors, the length of the cords, and how they were bundled and knotted together all told part of the message.  This encryption system was so successful that, even today, we cannot decipher the details of a quipa message.  The best we can do is get a general idea of what the message was about.


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