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Distributed storage plays an essential role in realizing robust and securedata storage in a network over long periods of time. A distributed storagesystem consists of a data owner machine, multiple storage servers and channelsto link them. In such a system, secret sharing scheme is widely adopted, inwhich secret data are split into multiple pieces and stored in each server. Toreconstruct them, the data owner should gather plural pieces. Shamir's (k,n)-threshold scheme, in which the data are split into n pieces (shares) forstorage and at least k pieces of them must be gathered for reconstruction,furnishes information theoretic security, that is, even if attackers couldcollect shares of less than the threshold k, they cannot get any informationabout the data, even with unlimited computing power. Behind this scenario,however, assumed is that data transmission and authentication must be perfectlysecure, which is not trivial in practice. Here we propose a totally informationtheoretically secure distributed storage system based on a user-friendlysingle-password-authenticated secret sharing scheme and secure transmissionusing quantum key distribution, and demonstrate it in the Tokyo metropolitanarea.

Unbreakable distributed storage with quantum key distribution network and password-authenticated secret sharing