Meta-Key: A Secure Data-Sharing Protocol Under Blockchain-Based Decentralized Storage Architecture

摘要

In this paper a secure data-sharing protocol under blockchain-baseddecentralised storage architecture is proposed, which fulfils users who need toshare their encrypted data on-cloud. It implements a remote data-sharingmechanism that enables data owners to share their encrypted data to other userswithout revealing the original key. Nor do they have to download on-cloud datawith re-encryption and re-uploading. Data security as well as efficiency areensured by symmetric encryption, whose keys are encrypted by user's public key.Then, the key-ciphertext is recorded into a blockchain system so reliabilityand secrecy are ensured. When data are necessary to be shared, proxyre-encryption is adopted in order to generate new symmetric keys as well ascorresponding ciphertexts dedicated for data-sharing so security of user'soriginal key can be well-remained.