Data Protection

Quantum Data Protection

Quantum computing does not just threaten encryption in the abstract — it changes what "reasonable" data protection looks like for any organisation holding long-lived sensitive personal data.

The "harvest now, decrypt later" problem

Data encrypted today can be intercepted and stored now, for decryption once capable quantum hardware exists in the future. For personal data with long confidentiality requirements — health records, financial history, government identifiers — this is a present risk, not a future one, and it should inform today's data protection impact assessments and retention policy, not just a future encryption migration plan.

Where this meets the DPDP Act

India's Digital Personal Data Protection Act requires data fiduciaries to implement reasonable security safeguards appropriate to the data they hold. As post-quantum cryptography standards mature and government guidance becomes more specific, the bar for what counts as "reasonable" is likely to rise — meaning organisations should treat quantum-readiness as part of their ongoing DPDP compliance programme, not a separate initiative.

A practical starting point

Identify which categories of personal data your organisation holds with the longest confidentiality horizon, prioritise those for early post-quantum cryptographic protection, and tighten retention policy so you are not holding more long-lived sensitive data than you need to — data you no longer hold cannot be harvested. See our full Data Protection & Privacy practice page.