Japan Cybersecurity and Post-Quantum Cryptography
On December 23, 2025, Japan’s National Cybersecurity Office released its new Cybersecurity Strategy (2025 Cyber Strategy) which emphasized “cyber resilience from the perspectives of national security and economic security.” As Japan elevates quantum-resistant security from a future planning issue to an immediate policy priority, it creates significant near-term opportunities for U.S. companies offering cybersecurity and post-quantum cryptography (PQC) solutions.
The 2025 Cyber Strategy specifically addresses the importance of developing effective countermeasures against “harvest now, decrypt later” intelligence gathering, whereby adversaries capture encrypted communications and store them for later decryption when the technology becomes available. The Government of Japan has therefore positioned cryptographic quantum resistance, and the transition to PQC, as a policy priority.
The 2025 Cyber Strategy also states that as the everyday, practical usages of quantum computers and quantum communication become increasingly realistic, concerns of both government and industry are growing that the security of widely used public-key cryptography may be compromised or weakened alongside these advancements. This necessitates addressing a wide range of challenges including cyberattack vulnerabilities and AI safety. As a result, PQC-related technologies and solutions have been elevated from a future consideration to an immediate action item in Japan.
The strategy further calls for strengthening critical infrastructure supply chains (such as finance, energy, and defense, which handle large volumes classified and confidential information) across Japan’s public and private sectors. As more Japanese companies recognize communications and data security as a business risk, quantum-ready security will be increasingly implemented by government agencies and critical infrastructure operators. The Japanese market is therefore a prime target for comprehensive, end to end supply chain solutions ranging from executive level risk assessment services to zero trust architecture redesigns that integrate post-quantum cryptographic solutions. American exporters looking to explore such opportunities may contact the U.S. Commercial Service in Japan at Office.Tokyo@trade.gov for more information.