2 results about "Attribute-based encryption" patented technology

The application discloses a cross-chain data transmission method and system, relates to the technical field of blockchains, and applies to a data possession end. The method comprises the following steps: generating a corresponding linear key matrix according to an access strategy of each attribute; encrypting to-be-transmitted data according to a security vector set and the linear key matrix to obtain target encrypted ciphertext; sending the target encrypted ciphertext to a main chain, and storing the target encrypted ciphertext to a target storage position through the main chain, so that a data user end obtains the target encrypted ciphertext through a relay chain and a parallel chain. The blockchains in the data transmission system are divided into the main chain, the parallel chain and the relay chain. Then, data is stored on a distributed storage network. Finally, an attribute-based encryption algorithm is used to resist quantum attacks and ensure the safety of data in the transmission process, so that the overall execution efficiency, the computing performance and the system safety of the blockchain network data transmission are improved.

A searchable registration attribute-based encryption method includes: generating a public reference string using a public reference string generator; users generating their own public and private keys; a key manager collecting and aggregating the public keys of all registered users to generate a unified master public key and auxiliary decryption keys; the data owner encrypting the original data while generating a searchable ciphertext index, uploading it to a cloud server for storage, thus achieving data encryption and searchability; the user generating a search trapdoor based on the keywords to be searched, sending it to the cloud server through a secure channel, with the trapdoor bound to the user's own attributes to ensure fine-grained search permissions; the cloud server verifying whether the user's attributes meet the access policy without decrypting the data, then performing keyword matching and returning the successfully matched ciphertext; the user using their private key, the ciphertext returned by the cloud server, and the search component to decrypt the ciphertext and recover the original data.