Distributed cloud storage is a hot topic for security researchers around the globe pursuing secure data storage and a team in China is now merging quantum physics with mature cryptography and storage techniques to achieve a cost-effective cloud storage solution.
Shamir’s secret sharing, a known method, is a key distribution algorithm. It involves distributing private information to a group so that ‘the secret’ can be revealed only when a majority pools their knowledge. It’s common to combine quantum key distribution (QKD) and Shamir’s secret sharing algorithm for secure storage – at an ‘utmost security level’. But utmost security solutions tend to bring substantial costs, including significant cloud storage space requirements.
An American Institute of Physics team has presented a new method that uses quantum random numbers as encryption keys, disperses the keys via Sharmir’s secret sharing algorithm, applies erasure coding within ciphertext, and securely transmits the data through QKD-protected networks to distributed clouds.
The method not only provides quantum security to the entire system but also offers fault tolerance and efficient storage – and this may help speed the adoption of quantum technologies.
The solution is currently feasible from both technological and engineering perspectives: it meets the requirement for relevant quantum and cryptographic standards to ensure a secure storage solution capable of withstanding the challenges posed by quantum computing.
More details can be found in the research paper ‘Quantum-secure fault-tolerant distributed cloud storage system’.