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One Public Key and Thousands of Private Keys

Prof Bill Buchanan OBE
8 min readJun 17, 2020

We cling onto wet signatures within the Internet era, but sometime soon we need to deprecate them, and their flawed associated methods. Within this COVID-19 period, I still get asked for my wet signature, and then take a GIF of my signature, and the paste it into a document, and produce a PDF of the whole document. Can anyone see the flaw here? Everyone knows that it’s not too difficult to convert a PDF into…

Prof Bill Buchanan OBE

Professor of Cryptography. Serial innovator. Believer in fairness, justice & freedom. Based in Edinburgh. Old World Breaker. New World Creator. Building trust.