In this letter we propose Meta-key, a data-sharing mechanism that enables users share their encrypted data under a blockchain-based decentralized storage architecture. All the data-encryption keys are encrypted by the owner's public key and put onto the blockchain for safe and secure storage and easy key-management. Encrypted data are stored in dedicated storage nodes and proxy re-encryption mechanism is used to ensure secure data-sharing in the untrusted environment. Security analysis of our model shows that the proxy re-encryption adopted in our system is naturally free from collusion-attack due to the specific architecture of Meta-key.
@article{arxiv.1710.07898,
title = {Meta-Key: A Secure Data-Sharing Protocol under Blockchain-Based Decentralised Storage Architecture},
author = {Dagang Li and Rong Du and Man Ho Au and Yue Fu},
journal= {arXiv preprint arXiv:1710.07898},
year = {2020}
}