This article series is in the Quantum Computing section of the Electronic Design Library as well as the Quantum Computing and Security and Cybersecurity TechXchanges.
Public key cryptography is one of the major components of online security. Prior to the advent of quantum computing, this approach was deemed to be very secure when properly implemented. Unfortunately, the current crop of crypto techniques are susceptible to attack by quantum computers but this has more to do with the approach chosen originally rather than a fault of public key encryption.