The Indian Computer Emergency Response Team (CERT-In), alongside cybersecurity firm SISA, cautions that these powerful machines could soon break the encryption used to protect everything from online banking to personal identity systems.

CERT-In's new white paper outlines how attackers may already be stockpiling encrypted data to unlock later using quantum tools, a tactic called 'harvest now, decrypt later'. If left unaddressed, this strategy could expose sensitive data stored today once quantum technology matures.

AI is adding to the urgency. As it becomes more embedded in digital systems, it also increases access to user data, raising the stakes if encryption is compromised. The biggest digital systems in India, including Aadhaar, cryptocurrencies, and smart devices, are seen as particularly exposed to this looming risk.

Everyday users are advised to take precautions: update devices regularly, use strong passwords with multi-factor authentication, and avoid storing sensitive data online long-term. Services like Signal or ProtonMail, which use strong encryption, are also recommended.