Should Indian Businesses Worry About Quantum Breaking Encryption?

As of 24 October 2026: the service descriptions, prices and turnaround figures on this page are current.

What is harvest now, decrypt later, and why should it worry an Indian business?

It is an adversary storing encrypted traffic and logs now, with the intention of decrypting them once a cryptographically relevant quantum computer exists. The traffic is useless while it is encrypted, so there is no immediate signal that an attack has happened, which is what makes the pattern attractive to state and criminal actors alike. For an Indian business the question is not whether the data will be broken next year, but how long the data must remain confidential. A medical record, a signed contract, a government identity document and a payment trail all carry confidentiality requirements measured in years, and some in decades, which is long enough for the curve to bend. The data that can be thrown away after a year is not the problem; the archive is.

Which encryption is actually at risk from quantum computing?

Two families, and the distinction matters. Public-key schemes, including RSA and elliptic-curve cryptography, are broken by Shor's algorithm, which solves the factorisation and discrete logarithm problems efficiently. That means a quantum computer of sufficient scale would break the key exchange and the signatures that TLS, code signing and document signing all depend on. Symmetric ciphers are not: AES-256 is not expected to be weakened by Grover's algorithm below an effective key size that is not practically reachable, and hash functions are similarly safe at 256 bits. So a quantum adversary is not an excuse to panic about your disk encryption, and it is a serious reason to plan a migration of your public-key layer, which in most estates means the certificate and key management estate rather than the data itself.

What should an organisation do now, before the migration is urgent?

Three things, all of which take months rather than years. First, take a cryptographic inventory: find every place a key lives, including certificates, code signing keys, API keys, SSH keys, encryption libraries and their versions, plus the data each one protects and how long it must stay confidential. Second, buy crypto-agility, by ensuring that key lengths, algorithms and certificate authorities can be changed centrally rather than in deployed software. Third, start the long-life data migration, replacing RSA and ECC key exchange with post-quantum hybrid schemes for the systems that hold the archives, and re-encrypting the data itself. Doing these in order means a future migration is a configuration change rather than a rebuild, which is the entire difference between a three-month project and an eighteen-month one.

Does the Indian regulatory position add any urgency?

It adds a reason to have the inventory before the audit asks for it. The Digital Personal Data Protection Act, 2023 requires appropriate safeguards for personal data, DPDP Rule 7 notification obligations commence from May 2027, and 83% of Indian organisations have not begun comprehensive DPDP implementation. When a notification analysis requires you to show that a record was protected, the crypto inventory is the evidence, and if a cryptographic control is going to change, it is far better to change it before the archive is at rest in a scheme you will have to migrate later. The financial and health sectors in India will feel this first, because their retention horizons are the longest and their data the most sensitive.

What are the common questions about Q?