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John Napier invented logarithms, and which can be used as the basics of modern cryptography, where El Gamal is a good example of this. If you are interested here is a link that illustrates how logarithms are used in modern cryptography.
Some key facts about John are:
Born in in the amazing Merchiston Tower in Edinburgh, Scotland.
Discovered logarithms.
Invented "Napier's bones" which made use of the decimal point.
We think that RSA will be cracked soon, and that the future of cryptography could lie in logarithms, thus his legacy will live on.
Enjoy!