“From Ancient Ciphers to Post-Quantum Cryptography: Advancing Cryptographic Resilience in the Era of Emerging Technologies.”

Cryptography has always evolved in response to changing technologies, capabilities, and threats. From the earliest substitution ciphers used to conceal messages in ancient civilizations to the mathematically grounded systems that secure today’s digital infrastructure, cryptography reflects humanity’s enduring need for trust in communication. Early cryptographic methods relied largely on manual techniques, offering limited protection. As analytical skills and tools advanced, the twentieth century marked a decisive turning point, with the emergence of modern cryptography founded on information theory, computational hardness, and rigorous security definitions. Breakthroughs such as in symmetric and public-key cryptosystem, as well as in digital signatures enabled secure communication over open networks and became essential to the growth of the internet, electronic commerce, and digital governance.

Today, cryptography stands as a pillar to secure communication. The anticipated arrival of large-scale quantum computers threatens to undermine widely deployed public-key cryptosystem, such as RSA (Rivest-Shamir-Adleman) and ECC (Elliptic Curve Cryptosystem), and raising concerns over long-term data confidentiality and system resilience. In response, the cryptographic community is developing quantum-safe, or post-quantum cryptographic solutions, designed to withstand both classical and quantum attacks, due to Shor’s algorithm. This transition is not merely a technical upgrade, but a strategic shift that demands foresight, crypto-agility, and coordinated global action.

By viewing cryptography as an evolving discipline, this talk traces the long curve of cryptographic evolution, highlighting key transitions that reshaped how secrecy, authentication, and trust are achieved. This talk also emphasizes the importance of adaptability in securing the digital future, from the ancient cryptographic techniques to modern cryptographic solutions resilience against AI-enabled (Artificial Intelligence) technology. With the advent of quantum computing coupled with artificial intelligence technology, the need for resilience has never been greater, and post quantum cryptography (PQC) represents the next frontier in protecting information against quantum threats. In addition to quantum threats, the increasing use of AI-assisted approaches in cryptanalysis introduces new and evolving challenges. By charting this evolutionary path of innovation, this talk also addresses why advancing cryptographic resilience is essential to securing the digital future. Ensuring long-term cryptographic resilience reminds us that digital trust depends on our ability to anticipate and adapt to emerging threats, ultimately enabling crypto-agile infrastructures.