Research Context and Problem Statement.
As of early 2026, the global transition to Post-Quantum Cryptography (PQC) has evolved from a theoretical imperative to a rigid regulatory mandate. This shift is primarily driven by the immediate exigency of the "Harvest Now, Decrypt Later" (HNDL) threat targeting data confidentiality. However, beyond the risk of decryption, the emergence of Cryptographically Relevant Quantum Computers (CRQCs) introduces a parallel threat to the fundamental integrity of digital infrastructure: "Trust Now, Forge Later" (TNFL). While HNDL compromises secrecy, TNFL targets the authenticity of digital signatures underpinning the global economy. This paper analyzes how four major powers—the United States, the European Union, the People's Republic of China, and the Russian Federation—are navigating these complex threats through the theoretical lens of the Collingridge Dilemma. Furthermore, the paper introduces the concept of 'Topological Cyberspace Bifurcation' to describe a systemic phase transition in global cyber-governance, where the emergence of CRQCs forces the unitary digital commons into two disjoint equilibria: the Western 'Hybrid' model and the Eastern 'Sovereign' model. We argue that this bifurcation precipitates a 'Compatibility Trap'. Specifically, technical incompatibility regarding post-quantum primitives systematically evolves into an insurmountable conflict of laws under Chapter V of the General Data Protection Regulation (GDPR). Under the EDPB Draft Guidelines 01/2025, state-of-the-art encryption serves as a valid supplementary measure only if it mathematically precludes disproportionate state access. Consequently, a multinational entity utilizing Eastern state-mandated cryptography cannot simultaneously satisfy the GDPR's transfer requirements established by the CJEU in Schrems II (C-311/18).
Methodology.
The research applies a comparative legal analysis combined with predictive policy modeling. Legal Analysis: We examine primary legislative texts enacted or amended between 2024 and 2026. Key instruments include the US COINS Act of 2025 and Cyber Resilience Act (EU), alongside China's 2026 amendments to the Cybersecurity Law and Russia's National Project "Data Economy". Predictive Modeling (Stress Testing): Moving beyond static analysis, the paper stress-tests the resilience of these regulatory frameworks by simulating two high-probability scenarios for the 2030-2032 timeline: a systemic HNDL data breach and a TNFL-enabled espionage incident in the North Sea. The latter dynamically models an attack targeting the network's classical authentication substrate, demonstrating how adversaries bypass the physical QKD layer by forging the legacy PKI 'handshake'.
Analysis: The Quantum Bifurcation.
The paper identifies a fundamental "Quantum Bifurcation" in global governance, challenging the traditional binary of "Western innovation" vs. "Eastern control."
The Western "Hybrid" Shift: We argue that the EU and US are executing a strategy of "legal engineering." They are solidifying non-binding instruments—specifically NIST PQC standards (FIPS 203-205) and EU roadmaps—into hard market requirements via legislation like the EU Cyber Resilience Act (CRA) and the US COINS Act, attempting to resolve the Collingridge Dilemma by fostering private-sector innovation. However, our analysis reveals a critical vulnerability: the reliance on decentralized private compliance creates latency. In the event of an integrity attack (TNFL), the coordination required to update authentication protocols across fragmented markets may prove too slow compared to centralized regimes.
The Eastern "Sovereign" Model: In contrast, China and Russia utilize a "preemptive control" model rooted in hard law. China's "Whole Nation System" and Russia's state-owned enterprises (Rosatom, RZhD) integrate regulation directly into the supply chain. These regimes utilize strict requirements to enforce immediate domestic compliance, prioritizing sovereignty.
Expected Results and Conclusions.
The policy simulations reveal a critical strategic trade-off. In the event of a 2032 TNFL incident—where an attacker forges a trusted update for critical infrastructure—the Eastern model ensures a swift, unified mobilization through state command, effectively mitigating the spread of forged credentials. Conversely, the Western model promotes cryptographic agility but faces higher risks of coordination failure among private actors. Furthermore, the analysis of the EuroQCI scenario demonstrates that infrastructure itself is becoming a regulatory tool. The EU's deployment of the EuroQCI creates a de facto regulatory perimeter that binds member states more effectively than traditional directives. Crucially, the research identifies a systemic 'Intra-Western Divergence': while the EU anchors its sovereign defense in physical-layer security through the EuroQCI initiative, the US National Security Agency (NSA) formally decries QKD as inadequate for securing National Security Systems. The aforementioned contradiction creates a fractured regulatory perimeter within the Atlantic alliance. The paper concludes that without trans-bloc harmonization, the digital economy risks fracturing into incompatible "quantum spheres of influence." We offer specific policy recommendations to mitigate these risks, emphasizing the urgent need for cross-border interoperability standards and PKI migration timelines. Only through application of such mechanisms can the "Western" sphere avoid internal fragmentation and effectively counter the existential risks of both HNDL and TNFL.
