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https://doi.org/10.1080/01611194.2016.1141556
https://doi.org/10.1080/01611194.2016.1141556
http://maa.publisher.ingentaconnect.com/search/article?option1=fulltext\&value1=cryptography\&operator9=AND\&option9=publications\&value9=maa\&freetype=unlimited\&sortDescending=true\&sortField=default\&pageSize=10\&index=14
https://cocalc.com
https://play.google.com/store/apps/details?id=uk.co.franklinheath.enigmasim\&hl=en\&gl=US
https://github.com/cryptii/cryptii
https://apps.apple.com/us/app/mininigma-enigma-simulator/id334855344
https://github.com/kaince/cryptography
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