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ポスト量子の脅威：日本はいかにして量子時代の暗号化に備えているか？

Imagine a master key capable of unlocking every vault in Tokyo’s financial district overnight, not through physical force, but mathematical supremacy. This isn’t speculative fiction; it’s the imminent reality of quantum computing. Current encryption standards like RSA and ECC, which safeguard everything from bank transfers to national security communications, could disintegrate under quantum processing power. For Japan’s business leaders, this represents more than a technical curiosity. It’s an existential threat to economic stability and corporate sovereignty. The vulnerability lies in Shor’s algorithm, a quantum approach that factors large numbers exponentially faster than classical computers. Once practical quantum machines arrive, experts suggest a decade or sooner, data encrypted today could be retrospectively decrypted. Intellectual property decades old, sensitive merger negotiations, even citizen health records could spill into hostile hands. The time…