75 results about "Multisignature" patented technology

The invention discloses a digital asset secure transaction system and method based on a block chain, and belongs to the cross field of block chain technology and financial science and technology. The system adopts a layered architecture design and comprises an intelligent contract execution layer, a distributed account book storage layer and a cross-chain interaction layer. The transaction method comprises the following steps: generating a digital identity certificate based on asymmetric encryption, and realizing privacy protection through zero-knowledge proof; a secure transaction channel is constructed by adopting a multi-signature mechanism, and sensitive data processing is performed in combination with a trusted execution environment; and designing a dynamic fragmentation strategy to optimize the transaction throughput, and establishing an on-chain and off-chain collaborative verification mechanism. The innovation point is that a double-layer verification model combining a verifiable delay function and a threshold signature is provided, and millisecond-level confirmation is realized while the transaction irreversibility is ensured. The system supports multi-chain asset atomic exchange, and interoperability of different block chain networks is realized through a heterogeneous cross-chain gateway. The scheme has the characteristics of high transaction confirmation speed, high privacy protection level and high system expansibility.

The invention relates to the technical field of service examination and approval, and discloses a service examination and approval processing method, device and equipment and a storage medium, and the method comprises the steps: receiving a user authorization request, verifying the user authorization request, and obtaining a sub-account certificate with a reading only permission; performing real-time data acquisition on the plurality of e-commerce platforms based on the sub-account credentials to obtain multi-dimensional user data including transaction records, operation data and evaluation information; inputting the multi-dimensional user data into a preset space-time sequence attention network and graph convolution hybrid model to carry out dynamic evaluation on a user behavior pattern to obtain risk quantitative indexes; inputting the risk quantitative indexes into a rule engine integrating an adaptive decision tree and a genetic algorithm for automatic decision making to obtain a graded approval decision; and performing multi-signature encryption on the execution instruction according to the graded approval decision to obtain a safety operation instruction and execution state information, thereby realizing full-process automation from data acquisition, risk assessment to decision execution.

A blockchain-based system and method for secure and auditable sharing of medical image studies between providers, patients, and authorized recipients. The system has modules for verifying identities of trusted healthcare providers as issuers of medical data, managing secure storage of medical images and metadata, minting non-fungible tokens (NFTs) representing patient ownership of studies, authenticating patient consent for data sharing, and controlling access to shared data by authorized parties. Issuer registration authenticates healthcare providers permitted to submit studies by verifying credentials against authoritative sources. Secure data management employs cryptographic wallets and smart contracts to ensure only verified issuers can create new medical data NFTs on the blockchain. Automated processing extracts medical data such as image files and metadata upon upload for separate secure storage, with metadata references encrypted in the associated NFT. The system generates patient-controlled wallets for managing ownership of their medical NFTs without separate identity verification. Patient consent for sharing data is authenticated through multi-signature wallets requiring patient approval before minting study NFTs. Controlled access for other parties is gated by cryptographic proofs of authorization without exposing data. The immutable blockchain ledger records all sharing transactions initiated through patient and provider wallets, providing transparency and an auditable trail of how and when medical data is shared or accessed and by whom. The decentralized architecture promotes patient control, security, and accountability in managing sensitive healthcare information.

The invention discloses an industrial equipment evidence obtaining data management method and system, equipment and a medium, and relates to the field of industrial data safety management. The method comprises the following steps: acquiring different types of evidence obtaining data of industrial equipment; carrying out cleaning and attribute labeling on the evidence obtaining data to obtain pre-processed evidence obtaining data; generating a unique hash value for the pre-processed evidence obtaining data, and writing the hash value and the labeled attribute into the block chain; storing the processed evidence obtaining data into a distributed file system and a database; performing multi-signature access control based on the smart contract of the block chain, and allowing a user to access requested data from a distributed file system and / or a database after the access request is approved; and recording each data access operation in the block chain through the smart contract. According to the method, high-reliability guarantee of the whole process of collecting, storing and accessing the evidence obtaining data of the industrial equipment is realized.

In certain embodiments, multisignature-based network operations are performed. Some embodiments may generate transformed instructions for a network operation and a set of sent messages based on an instruction precursor and obtain a set of signed messages corresponding to a set of sent messages. In connection with cryptographic verification of the set of signed messages, some embodiments cause the execution of the network operation based on the cryptographic verification satisfying a threshold number of valid signatures.

A computer-implemented method of automatic event and user-driven event triggers digital notarization on the data and documents on one or more blockchains, according to example embodiments. A method may combine a novel method of additional digital notary functions with existing hash algorithms, digital or electronic signature technologies, secured data or document storage and may add the novelty of assigning notary requirements to a digital asset in a digital dossier. Embodiments may include a digital asset with an aggregation of a digital dossier, notary specification, a notary party group, event-driven automated notary process, a multi-party automated notary process, and a multi-notary notary process. The notary specification may identify the items in the dossier that must, according an example embodiment, apply a notary, signature requirements, and other settings. The method may be applied for the lifecycle of activities for an asset independent of the time duration of the life of the asset.

The invention relates to a multi-signature method with aggregable and responsibility-traceable public keys, relates to the technical field of block chains, and is used for solving the problems that in a privacy protection block chain system, user identity tracking is difficult, the privacy of signers cannot be guaranteed, and privacy protection and effective supervision cannot be balanced. The multi-signature method comprises the following steps: generating a public and private key pair and public parameters; generating a user key; key distribution; user signature; the combiner aggregates and outputs the signature; verifying signature validity; the tracker tracks the signer. According to the method, the roles of the combiner and the tracker are set, the work of aggregating the signature share is completed by the combiner, and only the signature signed and output by the combiner is recognized as an effective signature. And meanwhile, when some illegal behaviors occur, a participant signer is tracked through a tracker, so that identity tracking of the block chain is effectively realized, and meanwhile, privacy of legal users is ensured.

Systems and methods for computer-implemented commodity transactions using blockchain-based smart contracts. A server with memory executes application to authenticate buyer and seller, receive listing with commodity identifier, quantity, quality, delivery terms, price; generate smart contract specifying participant identifiers, wallet or banking info, order and contract IDs, milestone events, settlement terms; commit contract to blockchain; escrow funds associated with contract; obtain shipment, inspection, and delivery status via oracle; verify milestone satisfaction; release escrowed funds accordingly; record settlement on chain; and update database. Modules may include compliance to compute taxes and fees, identity to perform KYC / AML, and dispute resolver to execute predefined remedies. Optional multisignature escrow and fiat or crypto settlement are supported. Executions store hashes and ledger indices to provide tamper evident audit trails.

The invention relates to a block chain on-chain and off-chain linkage query method and system based on a decentralized oracle machine, and the method comprises the steps: obtaining to-be-stored multi-modal data, storing the multi-modal data in an off-chain manner, obtaining a data abstract through abstract calculation, and obtaining a label and a value of the label through information labeling; constructing a time index; storing the time index, the label and the value of the label in a storage contract deployed on a chain; the storage under the chain synchronizes the data abstract and the storage address to an oracle contract deployed on the chain, and the oracle contract is subscribed by a decentralized oracle network; the storage contract responds to the user query and is sent to the oracle contract, and the nodes in the decentralized oracle network generate integrity proof based on the subscribed user query; and the decentralized oracle machine network aggregates the digital signatures of the nodes to obtain multiple signatures reaching a threshold value, and sends the original data, the multiple signatures and the integrity proof corresponding to the user query to the user to realize the block chain up-chain and down-chain linkage query.

The invention discloses a block chain service processing method and device, a medium and a program product. The method relates to the technical field of block chains, and comprises the following steps: generating a service processing request through a service initiator, and sending the service processing request to each signer; the service hash is signed according to the private key through a signer, and a signature result and a public key are sent to the smart contract; wherein each signer generates an independent public and private key pair in advance; through the smart contract, performing signature verification according to the signature result and the public key sent by each signature party, and updating the number of effective signatures according to the signature verification result; and through the smart contract, when it is determined that a predefined service processing condition is satisfied according to the number of effective signatures, triggering service processing logic, and writing a service processing result into the block chain. By adopting the technical scheme, the security of block chain service processing can be improved through a multi-signature mechanism and an intelligent contract technology, and the multi-signature processing efficiency is ensured.

According to the distributed oracle authentication system based on reputation scoring, selectable threshold signatures, multiple signatures and aggregation signatures are adopted to meet applications under different authentication requirements, automatic management and data verification of nodes are achieved through on-chain and off-chain cooperation, the on-chain part comprises a signature module, a reputation scoring module and an excitation module, and the off-chain part comprises a signature module, a reputation scoring module and a reputation scoring module. And dynamic scoring and automatic updating of the nodes are realized through an intelligent contract. And the under-chain part is responsible for data acquisition and verification and data integrity check of a Merkel tree structure. A scoring mechanism in the system is automatically updated based on the performance of nodes in a data verification task, and a high-reputation node is selected as a leader node, so that the anti-attack capability of the system and the reliability of task execution are improved. And through an automatic reward and punishment mechanism, the nodes are stimulated to maintain good service performance. The whole reputation management and election process is automatically executed through the smart contract, and it is ensured that the distributed Oracle system can operate efficiently and transparently without human intervention.

The invention discloses a decentralized identity authentication method using a DID technology, and the method comprises the following steps: S1, generating a public key and a private key by a user, and generating an identity identifier by using the public key; s2, the user combines the identity data with the identifier, encrypts the identity data and the identifier, and stores the encrypted identity data and identifier on the block chain; s3, the third-party authentication mechanism issues a verifiable certificate based on the identifier; s4, the user manages the verifiable certificate, signs the identity verification request by using a private key, and sends the signed identity verification request to the verifier; s5, the verifier verifies the validity of the signature through the public key on the block chain; s6, recording verification time, a signature and a result, and storing the verification time, the signature and the result on the block chain; s7, the user can recover the lost private key or identity identifier through multiple signatures or other mechanisms; and S8, providing a user-friendly interface, supporting cross-platform migration of identity data, following open standards and protocols, and establishing a transparent governance mechanism. According to the method, the block chain and the advanced encryption technology are combined, and safe storage and privacy protection of identity data are realized.

The invention discloses a multi-signature method based on an SIS trap door one-way function. The multi-signature method comprises the following steps: (1) Setup step: a trusted party takes a safety parameter as a public parameter required by an input and output scheme; (2) a KeyGen step: each signer outputs a public and private key pair by taking a public parameter as input; (3) Sign step: each signer takes the private key, the public key, the public parameter and the message as input and outputs a single signature for the message; (4) AggKey step: the verifier takes the signer public key set as input and outputs an aggregation public key; and (5) Verify step: a verifier outputs a bit 1 or 0 by taking the public parameter, the aggregated public key, the message and the multiple signatures as input, which represents that verification succeeds or fails. According to the method, the key homomorphism of the SIS trap door one-way function is utilized, so that multiple signatures of the data are realized; a lattice-based cryptosystem is used, so that the attack of a quantum algorithm can be resisted; the probability verification thought is used, and the efficiency of verifying multiple signatures is improved.

The invention discloses a commodity transaction data security management method and system based on a block chain, and relates to the technical field of commodity transaction data management, and the method comprises the steps: constructing a commodity transaction network based on the block chain, including sellers, buyers and consensus verification and supervision nodes, and guaranteeing the security of transaction data through employing distributed storage. A unique identifier is generated when the commodity information is linked, and the unique identifier is stored through a hash function and a digital signature. Transaction is driven by an intelligent contract, and consensus calculation is carried out by adopting right and interest proof, workload proof or entrusting right and interest proof. Orders are classified and stored, multiple signatures verify transactions, and funds are managed by an intelligent contract and released according to a transaction state. Commodity traceability adopts a time integral model to calculate a circulation process, and meanwhile, a privacy protection mechanism is utilized to ensure information security of two transaction parties. The method has better effects in the aspects of security, privacy and tamper-proofing capability.

The invention discloses an identity-based multi-signature system and method based on SM9 and key isolation, and the method comprises the steps: a signature user firstly sends identity information to a key generation center, and generates an initial moment signature key of the signature user; and the signature user interacts with the assist device, and the assist device generates key updating information. After receiving the secret key updating information, the signature user updates the temporary signature secret key of the signature user, carries out signature by using the updated temporary signature secret key, and then sends an individual signature to the intelligent contract module; the smart contract module verifies the legality of the individual signature, and if the signature is legal, an aggregation operation is carried out to generate multiple signatures; and if not, rejecting the signature. According to the method, the risk caused by key leakage in the multi-signature process is effectively reduced, the security of the signature process is remarkably improved, and the problems of key leakage risk and low signature efficiency in the existing multi-signature technology are solved.

The invention belongs to the technical field of automobile electronics, and particularly relates to an ECU secret key safety filling method and system. Bidirectional identity authentication is carried out, a secure communication channel between the KLM and the KMS is established by adopting an mTLS protocol, and identity counterfeiting attack is prevented in combination with a certificate bidirectional verification mechanism; secret key encryption transmission: carrying out asymmetric encryption on a secret key plaintext by using an ECU root secret key public key; multiple signature verification is carried out, ECU identity information is signed through a KLM working key private key, a key ciphertext is signed through the KMS working key private key, a KMS working key public key is signed through the KLM working key private key, and the ECU verifies the KLM identity legality and verifies the key integrity twice; the technical problems of identity counterfeiting and secret key leakage and tampering in the traditional secret key filling process are effectively solved, the purposes of secure transmission and secret key storage in the secret key filling process are achieved, and the automobile information security level is remarkably improved.

A request to perform an action related to a smart contract deployed on a blockchain may be received at a database system. The smart contract may be associated with a multi-signature authorization policy including one or more signature criteria for performing the action. A respective signature request message may be transmitted to a plurality of recipients. The signature request messages may identify the smart contract and the action. A plurality of signature response messages may be received. Two or more of the signature response messages may include a respective signature generated based on a respective private cryptographic key. An action execution message may be transmitted to execute the smart contract to perform the action. The action execution message may include the two or more signatures. The smart contract may be configured to perform the action when the two or more signatures comply with the multi-signature authorization policy.

The invention discloses a safe and efficient lattice-based multi-signature method, which introduces an ownership proving mechanism for verifying that a signer holds a legal key pair, and effectively prevents a malicious signer from controlling an aggregation public key to generate a forged signature by forging a public key. And signature participants are organized by adopting a homomorphic commitment mechanism and a tree structure, so that the interaction turns and the communication data volume required in the signature process can be effectively reduced. The tree structure localizes communication between participants, so that the overall bandwidth consumption can be reduced, the aggregation efficiency is improved, and good adaptability and expandability are shown in a large-scale distributed system. Compared with a traditional lattice-based multi-signature scheme, the method has the advantages that through structure optimization and process simplification, the communication data volume and the computing resource consumption can be remarkably reduced while the security is maintained, so that the scheme has higher feasibility and efficiency advantages in practical application.

The invention provides a vulnerability protection method and device, equipment, a medium and a product. Belongs to the technical field of network security. Uploading the vulnerability detection report to a block chain network, wherein an intelligent contract is deployed in the block chain network; obtaining at least one vulnerability fixing task, wherein the vulnerability fixing task comprises a vulnerability fixing difficulty level; determining a task execution end of the at least one vulnerability repair task according to the difficulty level, and issuing the corresponding vulnerability repair task to the task execution end; acquiring a vulnerability repair result returned by the task execution end; performing security detection on the vulnerability repair result according to a multi-signature mechanism of the block chain network and a preset rule of the smart contract; and under the condition that the vulnerability repair result passes the security detection, determining that vulnerability repair is completed. The technical problems of low security of vulnerability information and low system stability caused by vulnerability repair in related technologies are solved.

Users of a multisignature wallet can customize keys to initiate various transactions. As a user specifies roles to customize keys, a smart contract is updated to associate the roles with the keys, where the customized keys are then associated with the user's multisignature wallet. The user may perform transactions by signing using the key or an address of the key, where a transaction can be processed upon verifying the key and its role. Additionally, a privacy service can facilitate blockchain transactions initiated using a key of a multisignature wallet. The privacy service receives a transaction signed by a key of the multisignature wallet and identifies a proxy wallet using the key. The privacy service validates and signs the transaction, which is then sent to a proxy wallet. The proxy wallet can cause a blockchain transaction to be executed.

Techniques are presented for a blockchain-implemented method and system of controlling use of or access to a parking space. The method comprises generating a blockchain transaction indicative of a condition on use of, or access to, the parking space, the blockchain transaction comprising a multi-signature script requiring a plurality of signatures for completion of the blockchain transaction; providing a first subset of the plurality of signatures to the blockchain transaction to generate a partially signed signature script to partially complete the blockchain transaction; and responsive to the condition on use of or access to the parking space being satisfied, providing a second subset of the plurality of signatures to the blockchain transaction to fully complete the blockchain transaction.

The invention discloses a light client communication method, system and device based on a consensus committee, and a storage medium, belongs to the technical field of block chains, and solves the technical problem that an existing light client protocol still has obvious limitations in the aspects of storage and communication overhead, security and consensus mechanism compatibility. The invention discloses a light client protocol compatible with various consensus mechanisms and having universality and security, the protocol designs a consensus committee dynamic election mechanism without a trusted third party based on chain quality attributes, and provides a concise and efficient proof generation normal form in combination with weighted multiple signatures. On the premise of not depending on a centralized relay, a light client protocol keeps communication and storage complexity lower than a sub-linear level, and security threats such as Eclipse attacks and the like are effectively defended.

The invention relates to a cross-fragmentation block chain transaction control method. The method comprises the steps of performing initial logic fragmentation based on multi-dimensional performance indexes and historical behavior data of nodes; behavior characteristic data generated by the nodes in the actual transaction process are collected, and node reputation values are calculated and updated through a sliding window weighted average and time decay model; each logic fragment operates as an independent consensus unit, and an improved PBFT consensus protocol is adopted to perform transaction sorting and block generation; if the transaction relates to cross-fragmentation, screening high-reputation nodes, executing three-layer authentication of subjective, objective and recommendation trust, and using a BLS multi-signature verification path; and after the transaction is completed, synchronizing the state of each fragment, executing excitation or punishment on the node according to the transaction participation condition, and updating the reputation value of the node. According to the method and the device, dynamic screening, multilayer verification and excitation control of the cross-fragment transaction nodes can be realized, so that the system expansibility is improved, and the security and the adaptive capability are enhanced at the same time.

The present disclosure generally relates to methods, systems, apparatuses, and non-transitory computer readable media for managing cryptocurrency. A cryptocurrency management system has a cryptocurrency management device (CMD), a mobile communication device (MCD), and a cryptocurrency management server (CMS) that are each configured to store a respective private key for use in generating a respective authenticating signature for a multi-signature address of a cryptocurrency network. Any two of the three authenticating signatures capable of being generated by the CMD, MCD, and CMS may be combined to generate a fully authenticated request for transferring cryptocurrency associated with the multi-signature address. The system provides the user with a flexible self-custody solution that permits him or her to transfer cryptocurrency without having to access the private key stored at the CMS. However, the CMS enables for recovery in the event of loss or unavailability of one or both of the CMD and / or the MCD.

The present invention discloses a group key negotiation method for area perception in an unmanned system, which mainly solves the problems in the prior art such as not supporting multi-level group division, location privacy leakage, excessive overhead, and insecure group keys. The implementation scheme is as follows: constructing a drone system; each unmanned device converts its own position coordinates into a set of hierarchical encoded bit strings with hierarchical area attributes, and calculates the matching result of the area according to this set; each unmanned device calculates the member list of each hierarchical area according to the matching result; each unmanned device generates a multi-signature for the member list, and the remote control station verifies the consistency of the member list according to the multi-signature of the unmanned device; the remote control station and the unmanned devices in each area member list jointly negotiate the group key of each area; in each time period, the group key is updated according to the change of the member list. The present invention has good privacy, high update efficiency, and strong security, and can be used for group communication in unmanned systems.

A blockchain system has an identity-based blockchain account including a primary chain, a secondary chain, and at least one key book applying to the account, the at least one key book having a key page. The system includes: a hardware processor; and a memory device storing instructions. When the instructions are executed by the processor, they cause the processor to: record a multi-signature transaction originating from the account in the secondary chain; associate the transaction with the key page of the at least one key book, the key page including (i) a signature-authorization rule, and (ii) a plurality of keys corresponding to a plurality of transaction authorizers; record, in the secondary chain, an authorization of the transaction from a transaction authorizer of the plurality of transaction authorizers; and once a number of authorizations recorded on the secondary chain satisfies the signature-authorization rule, record the transaction on the primary chain for execution.

The present invention provides a multi-signature cross-chain system and method based on Raft consensus, including: a Raft consensus module: receiving cross-chain transactions, and synchronizing the received cross-chain transactions to all nodes in the network, and the nodes in the network perform Raft consensus on the cross-chain transactions; a multi-signature module: randomly electing a leader node based on all nodes in the network, the leader node generates corresponding proofs based on the cross-chain transactions after Raft consensus, and broadcasts the generated proofs to all nodes in the network. When the number of proofs generated meets a preset value, the proofs of all nodes are combined into a final proof, and the generated final proof is synchronized to all nodes in the network, and the nodes in the network perform Raft consensus on the final proof; a multi-signature verification module: verifying the validity of the final proof after Raft consensus based on the smart contract on the chain; a Proof storage on-chain module: the leader node stores the verified valid final proof on the chain.

The invention relates to a method comprising a quantum-resistant lattice-based accountable subgroup multi-signature scheme.

The invention discloses a traceable multi-signature method supporting a distributed aggregator and lightweight setting, which is characterized in that a decentralized signature generation mechanism is realized by adopting a cryptographic method comprising bilinear pairing, a linear homomorphic time lock, a cryptographic hash function and a BLS signature; the method specifically comprises the steps of system initialization, key generation, authorization generation and aggregation, prompt generation, partial signature and verification, authorization verification, signature aggregation, authorization revocation, signature verification and the like. Compared with the prior art, the method has a decentralized key generation mechanism, a distributed aggregator mechanism and a signature accountability function, so that high communication overhead caused by the use of a distributed key generation protocol and a single-point fault possibly caused by excessive dependence on a single aggregator are avoided; and meanwhile, a strong association mechanism between the signer and the final multiple signatures is established, and the signer is responsible for the signature behavior of the signer, so that the problems of low efficiency and high centralization of aggregators caused by dependence on a DKG protocol are effectively solved.

The present invention relates to the field of information security, and specifically refers to an RSA multiple blind signature method and system based on identity authentication. The method includes RSA initialization, CA public key certificate registration, public key certificate exchange, public key acquisition and verification, information encryption, signature initiation and multiple signatures, signature reception and verification, information sending, and information reception. The present invention uses the RSA algorithm to encrypt information, and at the same time adopts the CA authentication and local public key sharing mechanism to realize the authentication of message signatures, preventing impersonation of signature initiation and impersonation of signatures; the present invention adopts a scatter-type signature and identity authentication mechanism to realize the traceability of incorrect signatures and prevent the overall signature from failing due to a single incorrect signature, which can effectively replace the aggregate signature, and the time complexity only changes from 1 to O(n); the system includes a key generation tool, a data encryption and decryption module, a data signature and verification module, a trusted certification authority CA, an information storage device, and a transaction processor.