12 results about "Group signature" patented technology

The invention discloses a carbon emission abnormity traceability method and device, a medium and equipment, and belongs to the field of carbon emission, and the method comprises the steps: receiving a traceability request containing a to-be-verified data identifier, positioning target link data from a block chain storage, and executing signature verification and Hash consistency verification, thereby guaranteeing the authenticity and consistency of the data. And if the verification of the target link data is passed, verifying the inclusion relation of Merkle tree root hash of each link upwards layer by layer to confirm the integrity of the full-chain data. And if verification failure of any level is found, the feature data of the level is combined with an anomaly detection model based on an isolated forest algorithm, and an abnormal data node is positioned. And then, according to the signature information of the abnormal data node and the preset tracking secret key, a group signature verification and private key derivation process is applied, the responsibility participant is traced, and the tracing process of the carbon emission abnormity is completed, so that the problem that the carbon emission abnormal point cannot be accurately and efficiently traced in the prior art is effectively solved.

The application provides a kind of unmanned plane anonymous authentication and identity remote identification method, unmanned plane and its supervision equipment, the method includes: by unmanned plane service provider in advance selecting system main private key and main public key, define attribute set;And by unmanned plane registration process, generate and issue certificate for the unmanned plane;Unmanned plane running process, generate RID data packet that can be anonymous authentication and meet RID rule;RID data packet includes the following information: unmanned plane position, unmanned plane speed, unmanned plane attribute ciphertext, unmanned plane operator's location ciphertext, encrypted unmanned plane public key information, time stamp, group signature;Timing broadcast RID data packet, so that receiver obtains the position and flight speed of unmanned plane according to the received RID data packet. Utilize the scheme of the application, the effective management and privacy protection of unmanned plane can be realized.

Various methods for authenticating user devices in a group messaging protocol, such as messaging layer security (MLS), are described. Some methods make use of public and private tokens wherein the public token is derivable from the public token by use of a one-way function. Further methods replace the tokens with one-time signature key pairs. A further method makes use of a group signature scheme to allow traceability of user devices.

Provided is an electronic currency system comprising: a remittance apparatus, which is the remittance source of electronic currency to which additional information is added each time remittance is made; and a receiving apparatus, which is the remittance destination of the electronic currency. The remittance apparatus comprises a verification key reception unit configured to receive a group verification key of a group to which the receiving apparatus belongs, a signature unit configured to use a member signature key of the remittance apparatus to generate a group signature for the group verification key and a hash value of the additional information that is most recently added to the electronic currency, and a currency transmission unit configured to transmit to the receiving apparatus the electronic currency to which the group verification key, the hash value, and the group signature have been added as the additional information. This makes it possible to appropriately ensure the anonymity of a user of electronic currency while maintaining the traceability.

The invention belongs to the technical field of block chains, and particularly relates to an air quality data management method and device and a medium, and the method comprises the steps: combining a block chain technology with a linkable group signature mechanism, taking an ecological environment department node as a group administrator, and taking an air quality data collection node as a group member; and safety management and credible uplink of the air quality data in the whole process of acquisition, transmission and storage are realized. The data acquisition node performs group signature on the air quality data and uploads the air quality data on the premise of not exposing the real identity, so that the privacy of the data source node is protected, and a single-point device is prevented from being maliciously targeted; meanwhile, a link detection algorithm is introduced on the basis that group signature verification is passed and is used for identifying whether multiple signatures are from the same data acquisition node or not, so that Sybil attacks and malicious quantity swiping behaviors are effectively prevented, and extra calculation overhead caused by frequent opening of the group signatures is avoided.

The invention belongs to the technical field of copyright protection, and discloses a federated learning model-oriented anonymous traceable protection method, which comprises the following stages: system initialization and multi-key distribution, gradient updating and signature, federated aggregation, signature mapping and federated node fingerprint embedding and model distribution. According to the anonymous traceable protection method oriented to the federated learning model, a unique signature is introduced for each node and a training round in federated learning, and measurement based on cosine similarity is designed to detect a model leakage person; according to the method, group signatures and model watermarks are combined, model leakers are accurately tracked while anonymity of legal nodes is guaranteed, traceability is achieved, feasibility and practicability in actual federal learning application are guaranteed, anonymous tracking and responsibility attribution of potential leakers are achieved on the premise that model performance is not sacrificed, and the method is suitable for popularization and application. Therefore, the overall safety and reliability of the system are improved.

The application discloses a safe and credible distributed industrial internet identification analysis method and device, wherein the method comprises the following steps: identifier structure setting; trusted identity authentication; trusted identification registration; identification security analysis. The application firstly provides trusted authentication for the identity and identification of the nodes in the identification analysis system through the ordered multiple group signature technology, ensures the safe and credible identification source data, secondly improves the identifier structure setting by introducing the IPFS technology, thereby realizing the strong correlation of the identification and the source data, and finally realizes the safe storage and safe transmission of the identity certificate, the identification and the source data through the block chain and the asymmetric encryption technology. The application utilizes the block chain and the ordered multiple group signature algorithm, ensures the safe and credible industrial internet identification analysis system process, binds the identification and the source data, realizes the source safety of the industrial internet identification, and prevents the malicious modification of the enterprises on the industrial internet identification and the source data.

The invention belongs to the technical field of block chains, and particularly relates to a block chain-based carbon emission data trusted transaction and auditing method, which comprises a block chain trusted sensor node deployed in a workshop or equipment, an enterprise node and an auditing node. Group signature, double-chain evidence storage and auditing arbitration are combined to form a complete trusted architecture; a double-chain architecture with a data chain and an auditing chain separated is adopted, and efficient evidence storage and auditing isolation is achieved.

The application provides a time-limited group signature method with double privacy. The method comprises the following steps: a system initialization operation: generating system parameters and creating a time tree; an administrator initialization operation: the administrator generates his own public and private keys, pseudonym parameters, a register and a revocation list; a user joining a group operation: the user generates his own public and private keys, generates his own pseudonym and applies to join a group; a group certificate generation operation: the administrator issues a group certificate to the user who is approved and makes the user a group member; a group revocation operation: the administrator uses the time tree to obtain the current encryption time and verifies, and adds the group member whose time limit is invalid to the revocation list; a group signature generation operation: a message is sent to the group member, the group member signs the message and sends it to a signature verifier; a signature verification operation: the signature verifier verifies the group signature; and a signature tracker operation: if there is a dispute between the signature verifiers, the administrator is requested to arbitrate, and the administrator tracks the real identity of the corresponding group member.

The invention discloses an edge terminal-oriented federal differential privacy logistics express sheet security processing system, and relates to the technical field of image processing and privacy computing. According to the invention, for a logistics tail end distribution scene, a cloud-side-end three-layer architecture is adopted; a cloud server is responsible for surface sheet image rough desensitization and sample distribution; the edge server is responsible for jurisdiction terminal management, gradient aggregation and malicious detection; the edge terminal is internally provided with an image acquisition module, a fine desensitization module, a lightweight model training module, a differential privacy disturbance module, an anonymous identity verification module and a breakpoint resume module. Differential privacy noise adding is completed locally at the terminal, and it is ensured that the original gradient does not go out of the terminal; bidirectional anonymous verification is realized through group signature and zero-knowledge proof, and malicious behavior traceability is supported; a breakpoint resume and three-level cache mechanism is designed for a weak network environment, and the uploading success rate is improved. According to the method, data localization storage and quantifiable privacy protection are realized, various threats such as gradient inversion, Sybil attack and replay attack are effectively defended, the method adapts to the actual working conditions that logistics handheld terminal resources are limited and the network is unstable, and the safety, reliability and compliance of the system are remarkably improved.

The invention discloses a method and a system for automatically intercepting anonymous messages of a harassing sender, and relates to three entities, namely an anonymous sender, a message platform and a real-name receiver, and the method is divided into three stages, namely initialization, message sending and message replying. The invention designs an automatic anonymous user shielding mechanism which does not need to be pre-operated by a receiver aiming at the problem of malicious harassment of a contributor in anonymous submission. The core idea of the mechanism is to limit the unreplied user to continuously send the message, and at the same time, the technologies of encryption, random signature, group signature, zero-knowledge proof and the like are used to hide sensitive information such as message content, communication association, sender identity and type and the like for a message platform. The anonymity of the sender is protected to the maximum extent, and meanwhile the possibility that the receiver is harassed and damaged is effectively reduced.

The invention provides a mobile Internet of Things device group signature method and system based on privacy protection, and the method comprises the steps: obtaining a group initialization parameter generated by an issuer, and distributing a group signature key to a target device applying for joining a group based on the group initialization parameter; determining a current event token of the target device on the basis of the group signature key in combination with a preset event definition rule, and judging whether the event of the target vehicle changes or not on the basis of the event token to obtain a judgment result; if the judgment result is yes, signing based on the group signature key and the current event token to obtain a group signature; if the judgment result is no, signing based on the group signature successfully obtained last time and the current event token to obtain an event signature; and performing effective verification on the group signature or the event signature based on the group public key and the current event token to obtain an effective group signature or an effective event signature. According to the invention, the privacy protection requirement of dynamic change in the scene of the mobile Internet of Things is met.