Cybersecurity in the Era of Quantum Computing: Preparing for Post-Quantum Threats

Quantum computing is the future of computing with promised radical increase in processing capability; however, it is a threat the existing cybersecurity paradigm. Classical encryption techniques especially the ones based on public-key cryptography are insecure against quantum algorithms such as Shor’s algorithm where typical cryptographic schemes the use of which was exemplified by the RSA and ECC will be threatened. While torrents of research have been accomplished in building and developing quantum computers, the importance of post-quantum cryptography (PQC) becomes more felt. This paper attempts to look at the threats that quantum technologies pose to current cryptographic methods and the countermeasures that are being worked on to counter them. We do so to evaluate the current status on quantum computing and its ramifications to data security, as well as the work that academic and government institutions and business enterprises have done on coming with Quantum-Resistant Cryptography. In addition, the paper gives an overview of the most promising post-quantum cryptographic techniques including lattice cryptography, hash-based signatures, and code-based cryptosystems and cryptographic protocols that are under consideration as the next generation cryptographic protocols. It also tackles the problems related to the migration to the post-quantum cryptographic systems the problem of standardisation the problem of compatibility, and the problem of growth of new algorithms. Moreover, prescriptive advice on the concept of quantum readiness and timely implementation of cyber defence plans to safeguard sensitive data and crucial infrastructure against quantum risks is provided. Finally, the paper offers suggestions for the organisations for starting to transition to the post-quantum landscape in terms of using hybrid cryptographic systems and promoting cooperation in the fight against the threats of quantum technology world-wide.