8 results about "Group key management" patented technology

According to the distributed photovoltaic ring communication group key generation method provided by the invention, safe and efficient group key management is realized by combining a group number derivation mechanism, environment feature binding and a quantum key enhancement technology. The method comprises the steps that a preset broadcast root key is called from a concentrator, and the broadcast root key is used for deriving group keys of members in each group; acquiring environment characteristics of members in each group in a communication group corresponding to the concentrator, and recording an acquisition timestamp; summarizing the environmental characteristics of all members in the communication group, and performing hash processing on the summarized environmental characteristics to obtain an initial environmental characteristic vector; and generating a first group key with a preset length through a key derivation function based on the broadcast root key, the initial environment feature vector, the timestamp and a preset group identifier.

The invention discloses an unmanned aerial vehicle cluster dynamic cross-domain key management method and system based on the Chinese remainder theorem (CRT), a key generation center generates system public and private keys and public parameters, and a ground station and an unmanned aerial vehicle perform hierarchical registration and verify respective keys; the unmanned aerial vehicles respectively generate signature messages and send the signature messages to a specified ground station for identity verification, and the ground station constructs a group key based on CRT and publishes the group key to the block chain; when a new unmanned aerial vehicle applies for joining, a signature message is sent to the ground station, and the ground station updates and publishes the group key; when the unmanned aerial vehicle applies for leaving, a leaving message is sent to the ground station, and the ground station updates and publishes the group key. According to the method, complex operations such as bilinear pairing operation and large integer modular exponentiation operation are avoided by optimizing the group key derivation process based on the CRT, and the calculation complexity is remarkably reduced. Meanwhile, efficient cross-domain authentication and batch verification are realized through Pedersen commitment and a zero-knowledge proof technology, and communication and calculation overhead is reduced.

The invention discloses an intelligent medical information integration system, which comprises a medical data acquisition module, a self-adaptive processing module, a data storage management analysis module and an intelligent management information output module, and relates to the technical field of medical information management. The technical problem that safety, real-time performance and manageability of medical data cannot be fully guaranteed is solved, the medical data are divided according to the data sensitivity degree, a differential encryption strategy is adopted, and for core sensitive data, a fine-grained encryption mode of sensitive slice division-access control strategy binding-double-key encryption is adopted, so that the safety, real-time performance and manageability of the medical data are guaranteed, and the safety, real-time performance and manageability of the medical data are guaranteed. By combining a high-performance symmetric encryption algorithm and a key derivation mechanism, security encryption and fine-grained access control of core sensitive data are realized, and sensitive data leakage is prevented; for general sensitive data, a time window grouping-group key management-repetition mode compression encryption mode is adopted, so that the encryption and storage efficiency is improved while the security is ensured.

The invention provides a massive vector file storage encryption system and method, in the system, an encryption client is installed at a working terminal, and an encryption gateway is connected in series between the working terminal and a vector file storage server; the encryption client is used for realizing mapping from a network file system in the vector file storage server to a local file system in the working terminal and writing and reading processing of files; the encryption gateway is used for realizing storage protection of vector files based on a file storage protocol, realizing user group key management, distributing different group keys according to different user groups, performing encryption protection on the vector files to which the user groups belong, and ensuring that authorized users can access the vector files in the corresponding user groups. According to the method, high-performance vector file encryption and decryption transmission and storage can be realized, vector file isolation protection is realized through group access control, vector file processing application and storage server transformation are not needed, the performance is high, and the safety of vector file storage is improved.

The application discloses a kind of unmanned aerial vehicle self-organizing network group key management methods supporting member dynamic joining, quitting and key recovery, belongs to unmanned aerial vehicle self-organizing network security communication technical field.The method includes: system initialization;UAV node is registered, and based on physically unclonable function generation and equipment binding key material;Utilize Cuckoo filter to quickly screen legal members;Two-way authentication and key exchange process are executed between adjacent nodes and establish edge session key;Group key derivation is realized based on edge session key;When node is lost, group key recovery is executed;When member dynamic joins, quits or is revoked, group key update is executed.The method can reduce authentication and key management overhead, improve the processing efficiency when node recovery and member change, and ensure the forward security, backward security, integrity and confidentiality of group communication.

Disclosed herein is an apparatus and method for federated learning based on group key management. The apparatus receives learning group participation request information from a learning node that intends to participate in a federated learning group, updates a group key required for the learning node to participate in federated learning using a key material generated by hashing the learning group participation request information, decrypts an encrypted local variable received from the learning node and thereby updates the same to a global variable, and transmits the global variable to the learning node after encrypting the same using the updated group key.

The invention relates to the technical field of computer application, and provides a group key management method and system for a space-ground integrated block chain network, and the method comprises the steps: carrying out the initial installation of block chain nodes, and employing two key shares for each node; after the block chain node is initially installed, electing a right agent node in a secret sharing mode; after the right agent node election is completed, a group key is calculated in a secret sharing and user key share hiding mode; in the group session, when the common node exits, the group key is recalculated in a secret sharing mode; in the group session, when the corruption node exits, recalculating the group key by adopting a secret sharing and corruption node broadcasting mode; in a group session, when a new node joins, a one-way message digest function is used to calculate a new group key. According to the invention, safer, more efficient and more reliable guarantee is provided for network communication, and a solid security foundation can be provided for various application scenes.