Abstract: Method, device and system for building blockchain-based secure aggregation in federated learning with data removal are provided. The method includes: selecting a first quantity of client nodes, to participate in an i-th iteration; sending a list of the selected client nodes to each of the first quantity of client nodes; acquiring model training information transmitted by each of a second quantity of client nodes, the model training information being transmitted in a form of cypher text, where the cypher text is generated by performing homomorphic encryption on the model training information based on pairwise seeds computed for each of the first quantity of client nodes from a symmetric bivariate polynomial and a private seed computed from asymmetric bivariate polynomial; aggregating the cypher text to obtain an aggregate result; and broadcasting a list of the second quantity of client nodes and the aggregate result via a blockchain.

Abstract: Disclosed is a method for constructing an emergency reporting system of vehicle networking based on multi-signatures, which comprises the following steps: initializing an emergency reporting system to obtain a public-private key pair and pre-calculation parameters of a vehicle set; obtaining authentication information of the emergency based on the public-private key pair and the pre-calculation parameters; integrating the authentication information to obtain multi-signatures of the emergency; and completing the system construction by regulating a traffic state based on the multi-signatures. The method realizes the efficient signature generation function of the vehicle with limited computing resources, reduces the communication pressure and computing pressure of roadside units, and may effectively prevent the common rogue key attacks in other schemes.

Abstract: Disclosed is a method for constructing an emergency reporting system of vehicle networking based on multi-signatures, which comprises the following steps: initializing an emergency reporting system to obtain a public-private key pair and pre-calculation parameters of a vehicle set; obtaining authentication information of the emergency based on the public-private key pair and the pre-calculation parameters; integrating the authentication information to obtain multi-signatures of the emergency; and completing the system construction by regulating a traffic state based on the multi-signatures. The method realizes the efficient signature generation function of the vehicle with limited computing resources, reduces the communication pressure and computing pressure of roadside units, and may effectively prevent the common rogue key attacks in other schemes.

Abstract: A method of digital forensics based on blockchain technology and a fine-grained access control scheme, using a finite state machine (FSM) based on smart contracts to manage a digital certificate, where a law enforcement agency ends the warrant request to a court and upon approval of the request collects the forensics data by obtaining the master secret key for accessing the forensic data from a plurality of authorities. The forensics data are encrypted by D-KP-ABE (Distributed Key Police Attribute-based Encryption) with privacy-preserved access policy. The secret sharings are required to form the decryption key for accessing the forensics data. The secret sharings are distributed among the plurality of authorized authorities so that no individual authority has a complete master key by itself. Each state of the FSM requires digital signature(s) of at least one specific authorized authority for transitioning to a next state.

Abstract: A method of digital forensics based on blockchain technology and a fine-grained access control scheme, using a finite state machine (FSM) based on smart contracts to manage a digital certificate, where a law enforcement agency ends the warrant request to a court and upon approval of the request collects the forensics data by obtaining the master secret key for accessing the forensic data from a plurality of authorities. The forensics data are encrypted by D-KP-ABE (Distributed Key Police Attribute-based Encryption) with privacy-preserved access policy. The secret sharings are required to form the decryption key for accessing the forensics data. The secret sharings are distributed among the plurality of authorized authorities so that no individual authority has a complete master key by itself. Each state of the FSM requires digital signature(s) of at least one specific authorized authority for transitioning to a next state.

Abstract: There are provided an array substrate, a display panel and a display device. The array substrate includes a display area and a non-display area. The non-display area include: at least one first wiring configured to be connected with a signal line within the display area and with a driver integrated circuit disposed within the non-display area; and at least one second wiring configured to cause photoresist to be uniformly distributed during a spin coating process of the photoresist.

Abstract: There are provided an array substrate, a display panel and a display device. The array substrate includes a display area and a non-display area. The non-display area include: at least one first wiring configured to be connected with a signal line within the display area and with a driver integrated circuit disposed within the non-display area; and at least one second wiring configured to cause photoresist to be uniformly distributed during a spin coating process of the photoresist.