Meta-Key: A Secure Data-Sharing Protocol under Blockchain-Based Decentralised Storage Architecture
This addresses data security for users in untrusted decentralized environments, but appears incremental as it builds on existing blockchain and encryption techniques.
The paper tackles secure data-sharing in decentralized storage by proposing Meta-Key, a protocol that uses blockchain for key management and proxy re-encryption, with security analysis showing it is free from collusion attacks.
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.