59 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.

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.

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 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 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.

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.

The application relates to a multi-signature method, a multi-signature verification method and a device of a blockchain platform. The multi-signature method of the application acquires a signature address corresponding to a multi-signature transaction, thereby determining signature data of the multi-signature transaction, and then encrypts user signature data in the signature data by using a locally pre-stored private key to cover the user signature data, thereby realizing an encryption process of the multi-signature. After the encryption is completed, a signature user list, an updated signed user list and a signature threshold are used to perform an operation of a blockchain chaining process, thereby broadcasting the updated signature data to the blockchain. The application can effectively apply a multi-signature scheme to the blockchain.

The application belongs to the technical field of blockchains, and particularly relates to a resource allocation method, a resource allocation device, a computer readable medium and an electronic device. The resource allocation method comprises the following steps: sending a contract template for agreeing on a resource allocation rule to a transaction platform node in a blockchain network, so that the transaction platform node performs content filling and signature processing on the contract template to obtain a single-party signed smart contract carrying a digital signature of the transaction platform node; sending the single-party signed smart contract to a transaction subject node in the blockchain network, so that the transaction subject node performs content checking and signature processing on the single-party signed smart contract to obtain a multi-signature smart contract carrying a digital signature of the transaction platform and a digital signature of the transaction subject; performing signature checking on the multi-signature smart contract, and allocating resources to the transaction platform node and the transaction subject node according to the multi-signature smart contract that passes the checking. The method can improve the reliability and credibility of network transactions.

This application relates to the field of data security technology, specifically to a method and system for verifying the anti-counterfeiting of digital property rights certificates. The method includes: generating a digital property rights certificate based on user-submitted property rights information; constructing multiple sub-tasks for multiple contents requiring digital signatures and sending them to different participants; determining the signing order of participants performing parallel multi-signatures according to their historical signing times to generate an initial multi-signature; setting a key update mechanism to regenerate a new multi-signature; and randomly verifying the generated multi-signature multiple times to verify the validity of the digital property rights certificate. This application aims to improve the efficiency and reliability of anti-counterfeiting verification of digital property rights certificates.

Techniques are provided for generating and using a multi-signature token for electronic message validation according to the one or more embodiments as described herein. Specifically, a multi-signature token may be generated that includes at least two digital signatures and information (e.g., user information). Each of the at least two digital signatures may be generated using a private key of at least two key pairs that are maintained on a plurality of keystores that have at least two different implementations (e.g., security protocols). If the at least two digital signatures are valid, the multi-signature token may be determined to be valid and the client request may optionally be performed. If at least one of the at least two digital signatures is invalid, the client request is optionally not performed.

The invention relates to a locally verifiable non-interactive identity multi-signature method, and provides a locally verifiable identity multi-signature method (LV-IBMS) based on bilinear pairings, which supports verification of validity of a signature for a specific user through auxiliary information under the condition that a complete signer set is not exposed. The scheme has a non-interactive signature process, compact signature generation is realized through an exponential inverse aggregation technology, and the size of auxiliary information required to be acquired by local verification is constant. In addition, under the condition that the scheme is simply expanded, the scheme also allows the verifier to verify the legality of the signature on the signer subset with the help of the auxiliary information, and the size of the auxiliary information is independent of the size of the subset, so that the communication and calculation overhead of the signature verification for the specific subset is further reduced.

A computer implemented method for generating a multisignature transaction for a blockchain comprising: receiving a first output and a non-signature portion of a first input, the first input comprising an outpoint to a first spendable transaction output encoding a multisignature requirement; electronically signing the first output and the non-signature portion of the first input, thereby generating a signature for satisfying the multisignature requirement when included with: (i) an associated sighash single flag, and (ii) at least one other signature; receiving a second output and a non-signature portion of a second input, the second input comprising an outpoint to a second spendable transaction output encoding a signature requirement requiring at least one signature; and electronically signing the second output and the non-signature portion of the second input, thereby generating a signature for at least partially satisfying the signature requirement when included in a signature portion with an associated sighash single flag.

The invention provides an electronic data evidence chain solidification method and system based on a block chain technology. The method comprises the following steps: collecting real-time target evidence data from a plurality of data sources; the format of the target evidence data is a text format; classifying the real-time target evidence data based on a text classification model to obtain various types of to-be-mapped data; mapping various types of to-be-mapped data based on a preset evidence chain standard, and performing data conversion on the mapped data based on a preset storage format to obtain standard evidence chain data; performing encryption processing and uplink operation on the standard evidence chain data to obtain an evidence block chain containing the standard evidence chain data; and protecting data security in the evidence block chain by adopting a multi-signature and distributed storage technology, and completing electronic data evidence chain solidification. According to the method, accurate text classification, decentralization, non-tampering and traceability are realized.

The embodiment of the present invention provides a transfer method based on a consortium chain, which includes determining k transaction participating nodes for multiple signatures from each node of the consortium chain through a proof of work mechanism for a transfer transaction of a transaction initiating node in the consortium chain, obtaining random numbers of each transaction node in the transaction node set composed of the transaction initiating node and the k transaction participating nodes from the consortium chain, and generating a signature of the transaction node for the transfer transaction based on the signature mechanism, performing aggregation processing based on the signatures of the transfer transactions of each transaction node through an aggregation node to obtain an aggregate signature, verifying the aggregate signature through a verification node, and executing the transfer transaction after the verification is passed. In this way, the scheme can ensure that the signature capabilities of each selected transaction participating node are relatively strong through the proof of work mechanism, thereby improving the success rate of the aggregate signature, thereby effectively improving the efficiency of the entire transfer transaction.