3 results about "Broadcast encryption" patented technology

A computer-implemented method of enabling users to access broadcasted messages using blockchain transactions comprising: determining a set of users eligible to access a message; maintaining a key graph comprising a plurality of nodes representing keys, generating an encrypted message; determining a set of encrypted data items; obtaining a message transaction comprising: a respective input associated and signed by each respective user, a respective input associated with and signed by the broadcasting party, a respective output associated with and locked to a respective public key of the respective user and / or a public key of the broadcasting party, and a respective output comprising the set of encrypted data items; causing the message transaction to be submitted to a blockchain network; and broadcasting the encrypted message to at least the set of users.

This application discloses a data transmission method, apparatus, computer device, and storage medium. The method includes: negotiating a key between a first device and each second device based on preset configuration parameters to generate a broadcast key and a content key between the first device and each second device; encrypting broadcast data using the broadcast key to generate encrypted broadcast data, and broadcasting the encrypted broadcast data; when connecting to a target second device that communicates with the first device based on the encrypted broadcast data, encrypting the content data using the content key to generate encrypted content data; sending the encrypted content data to the target second device and receiving the encrypted data processing result returned by the target second device based on the encrypted content data; and decrypting the encrypted data processing result using the content key to obtain the data processing result. By using the content key and broadcast key negotiated between the devices for encrypted data transmission, data security is ensured.

The application discloses a privacy protection system based on federated learning and relates to the technical field of privacy protection.The system comprises a distributed participating node cluster, each participating node is configured with a local model training unit and a privacy protection module, a coordination server connected with each participating node through a secure communication layer, containing a model aggregation module and a dynamic trust evaluation module, a global model distribution channel for broadcasting encrypted global model parameters to participating nodes, and a privacy protection module integrated in the local participating node, containing a homomorphic encryption engine and a local differential privacy injector.The application synchronously achieves the improvement of privacy protection strength, the optimization of model utility, the breakthrough of system efficiency and the expansion of security boundary under the federated learning framework, and provides an industrial-level solution for cross-domain data collaborative learning.