The four partners have now done this by developing an integrated key management and share control system. They have demonstrated its ability to advance personalized healthcare with a use case that demonstrates secure storage and reconstruction of bulk genomic data, plus storage of genome data on numerous individuals in multiple locations, that can be reconstructed as and when necessary, with personal authentication.
The integrated platform provides unified management and operation of quantum cryptography, secret sharing, and personal authentication. It integrates functions for generating cryptographic keys and random numbers, which are used in large numbers in quantum cryptography and secret sharing, and achieves unified operation of data transmission and storage. As it provides cryptographic keys and random numbers in the same format, and they can be used interchangeably, it realizes highly efficient operation of a large-scale system.
Transmission of large volumes of genomic data requires a large number of quantum encryption keys, but the speed at which they can be generated is limited. Until now, distributed backup systems that store multiple shares at multiple locations have done so at fixed locations. However, the current use case requires distributed storage of large volumes of data on individuals at any given time, which would prevent efficient use of quantum cryptographic keys. The new share control system uses information on remaining quantum encryption keys at each distributed location to determine optimal storage locations, and associates the information with individual IDs. This realizes efficient, secure storage of large volumes of personal data at multiple locations in a large-scale system, and also facilitates data reconstruction and secure use by using personal authentication to identify and reconstruct specific shares.
By linking the distributed data storage technology demonstrated in July 2021 and integrating it with the newly developed key management system and share control system, the four parties have established a personalized healthcare system. Authentication of individuals and personal genome data sharing and reconstruction is based on the My Number Card, an individual ID card issued by the Japanese Government. Genome analysis data cannot be reconstructed at medical centers without the cardholder's consent, preventing information leakage. Demonstrations at ToMMo and Tohoku University Hospital have confirmed the feasibility of this information-safe, practical personalized healthcare system, that can also reconstruct data from shares stored at other sites if data is lost at one site due to a disaster.