Securing Post-Quantum Cryptography: Mitigating Side-Channel Vulnerabilities in the Quantum Era

Abstract

Post-quantum cryptographic (PQC) algorithms, designed to defend against quantum threats, present new implementation challenges, particularly their susceptibility to side-channel attacks (SCAs). Unlike traditional attacks that exploit mathematical weaknesses, SCAs target physical properties—such as timing, power, and electromagnetic emissions—during cryptographic operations to expose sensitive data like private keys. PQC schemes, including lattice-based, code-based, and hash-based algorithms, may inadvertently leak critical information through these channels, despite their resistance to quantum attacks. This presentation examines the potential for SCAs to exploit vulnerabilities within PQC implementations, assessing various attack vectors and identifying specific algorithmic features at risk. Our analysis reveals that many PQC algorithms are still susceptible to side-channel leakage, highlighting a need for security measures that address these risks. We explore the effectiveness of SCA techniques such as differential power analysis, electromagnetic analysis, and timing attacks, as well as the role of software supply chain integrity—through Software Bill of Materials (SBOM) and quality assurance—in safeguarding PQC systems. The findings underscore the importance of developing secure software supply chains, resilient hardware, and robust PQC implementations that ensure end-to-end security. This holistic approach is essential for protecting cryptographic systems as we advance into the post-quantum era.