Photo by Gayatri Malhotra on Unsplash

The Day I “Got” Public Key Encryption … Here’s The Mod Root

--

The day that I really got public key cryptography was when I realised why we used prime numbers and the modulus operation. Basically, we could perform any maths operation we wanted, and could then reverse it. So we could add:

c = a + b (mod p)

and which has the same result as:

--

--

Prof Bill Buchanan OBE FRSE
ASecuritySite: When Bob Met Alice

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