Public-key cryptosystems allow several use-cases which symmetric cryptosystems do not. One which has come to have more and more importance in the modern digital economy is the creation of digital sign...Public-key cryptosystems allow several use-cases which symmetric cryptosystems do not. One which has come to have more and more importance in the modern digital economy is the creation of digital signatures – these are parts of electronic documents which are supposed to have something of the qualities of a physical signature in that are hard for an imposter to forge.