2results about How to "Flexible Access Control" patented technology

The application discloses a cross-industry supply chain supervision method based on multi-chain cooperation, a business sub-chain is used for recording internal information of enterprise transaction subjects and business data of various supply processes; a transaction main chain is mainly responsible for transaction implementation and interaction between different businesses, and records circulation states and transaction data of commodities at various links of the supply chain; and a supervision chain is used for supervising and auditing transaction data between different businesses of the supply chain. The application combines an identity-based encryption mechanism based on fine-grained privacy protection, protects the privacy of multi-party cooperative transaction data in the supply chain process, and solves the contradiction between the privacy of supply chain transaction data and the implementation of supervision. The application designs two verification methods of transaction types based on an aggregated signature protocol, so as to realize aggregated verification of on-chain transactions and rapid tracking of abnormal transactions, and effectively improves the performance of system supervision and traceability.

This invention belongs to, but is not limited to, the field of information security technology, and particularly relates to an efficient data sharing method and system supporting user revocation and key tracking, comprising: system initialization, where an attribute authority generates a master public key and a master private key; attribute key generation, where a data user sends a key request to the authority and receives the corresponding attribute key; data encryption, where the data owner formulates an access policy for their data and encrypts the data accordingly, then uploads the ciphertext to the cloud; update key generation, where the attribute authority generates an update key for its maintained revocation list; decryption key generation, where the data user executes to obtain the decryption key; ciphertext decryption, where users who meet the policy and have not been revoked can decrypt the data; and tracking data encryption and malicious user tracking, where any user can perform tracking encryption to complete malicious user tracking.