Science & Cybersecurity
Q-day refers to the point when a cryptographically relevant quantum computer becomes powerful enough to break widely used encryption standards such as RSA-2048, posing a serious threat to global digital security, financial systems, and critical infrastructure.
The concern originates from Shor’s algorithm (1994), which demonstrated that a sufficiently large quantum computer could factor large numbers exponentially faster than classical computers, undermining the mathematical foundations of today’s public-key cryptography.
APSC relevance: Important for cybersecurity, quantum computing risks, and the future of digital governance and data protection.
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