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February, 1883: August Kerckhoffs, a linguist and professor of German at HEC, published an article in the Journal of Military Science that was to go down in history. Without realizing it, Kerckhoff had laid the foundations for modern cryptography, which was to make him universally recognized as the father of all computer security. Initially applied to telegraphs, “Kerckhoffs’s principle” declared the significance of the key in the creation of algorithms. In other words, it is thanks to this man that we use passwords and pin codes today!