27 results about "Aggregate signature" patented technology

A signature control method implemented by a computer, the signature control method including: acquiring, by a processor circuit of the computer, a plurality of pieces of document information and signature information that corresponds to each piece of document information of the plurality of pieces of document information; generating, by the processor circuit of the computer, aggregate signature information obtained by aggregating the signature information that corresponds to the each piece of document information of the plurality of acquired pieces of document information on a basis of the plurality of acquired pieces of document information; and outputting, by the processor circuit of the computer, the generated aggregate signature information in association with aggregate public key information obtained by aggregating public key information that corresponds to the each piece of document information of the plurality of pieces of document information and the plurality of pieces of document information.

A method for aggregating digital signatures includes receiving first data packages from signers, each first data package including a signer identifier, a payload, and a payload signature; verifying the payload signatures; bundling correctly signed payloads into a batch; obtaining a batch digest, and proofs of inclusion of the payloads in the batch. In some embodiments, the method further includes sending second data packages including the batch digest and a respective proof of inclusion to the signers, the respective proof of inclusion proving that the payload of the respective signer is included in the batch; receiving third data packages from the signers, each third data package including the signer identifier, and a respective batch digest signature. The method may additionally include verifying the batch digest signatures; aggregating correctly signed batch digest signatures; and including the aggregated batch digest signature in the batch.

The invention discloses an Internet of Vehicles cross-domain authentication and key agreement method based on a double-chain structure. The method comprises the following steps: generating system public parameters based on a trusted authority and writing the system public parameters into a main chain; generating a corresponding identity encryption value, a reputation value, an area number and a vehicle and road side unit binding value based on the road side unit registration information; generating a virtual identity, a secret value and a binding parameter of the vehicle based on the vehicle user registration information; the vehicle obtains a binding value of the vehicle and the roadside unit based on the binding parameter and initiates authentication to the roadside unit to obtain an area number; when the vehicle needs cross-domain communication, the vehicle generates a hidden identity and a cross-domain request based on target area verification node information, and a verification node generates an aggregation signature and an encryption seed after verifying the cross-domain request; the main node verifies the legality of the vehicle based on the aggregation signature, and decrypts the encrypted seed to obtain a seed; and the main node queries in the main chain based on the area number and the virtual identity of the vehicle to obtain a secret value, and verifies the session key based on the secret value and the seed.

The invention discloses a trusted data aggregation method and system for a large-scale distributed intelligent terminal. The method comprises the following steps: step 1, initializing and defining public parameters and private parameters of each entity of an access layer; step 2, the intelligent terminal of the end layer converts the multi-dimensional data into single data for encryption and signature by using the parameters in the step 1), sends the encrypted data and the signature to an edge aggregator of the edge layer, and sends the signature to a block chain of the chain layer at the same time; step 3, an edge aggregator of the edge layer performs weighted aggregation on the encrypted data in the step 2), aggregates signatures, and sends the signatures to a control center of the cloud layer and a block chain of the chain layer; and step 4, the control center of the cloud layer decrypts by using the aggregated data in the step 3) to obtain a single-dimensional data aggregation value, and the block chain of the chain layer performs signature verification by using the aggregated signature value sent in the step 3) and the single-dimensional data aggregation value decrypted by the control center.

The application discloses a kind of high efficiency and privacy protection asynchronous payment method based on block chain, belong to the field of block chain privacy protection technology.This method supports the case where multiple transactions are generated in the system to protect user privacy.The signature of all transactions of the user is aggregated into a single aggregate signature for aggregate verification.This method extends the single verification of locally verifiable signature to subset verification.Later, without knowing all user transactions, the subset of transactions that need to be delayed can be decompressed from this aggregate signature.The method deploys a server to provide a time key so that the delayed payment service provider can only rewrite the on-chain transaction at a specific point in time.Follow-up changes to the transaction through the trapdoor of chameleon hashing only require node network verification, saving time and arithmetic capability compared to generating a new transaction.The method has practical security features and more acceptable efficiency in terms of computational complexity and communication overhead.

The invention relates to the technical field of block chain security and data asset management, and discloses a data asset life cycle management system based on a block chain. And encryption group parameters and generators are generated and checked through a secure random source, so that the randomness and the anti-attack capability of a bottom-layer password system are ensured. And a secret polynomial is adopted to segment the master key and distribute the master key to each node, so that distributed key management is realized, and the risk of single-point loss is reduced. Attributes are automatically judged during asset registration, the life cycle stage is accurately mapped, and management automation and state tracking are improved. A standardized event message is constructed for each asset state change, and node part signature and threshold aggregation signature are adopted to ensure the consistency and non-tampering property of an audit chain. And the private key share is dynamically updated during node change or period remodeling, so that the risk of long-term key leakage is reduced. After the assets are terminated, all keys are automatically destroyed, only necessary chain records are left, and the residual keys are prevented from being abused.

The invention provides a trusted data space data interaction method based on a block chain oracle machine, and relates to the technical field of block chains, and the method comprises the steps: receiving a data packet sent by a data provider; performing BLS aggregation signature verification on the BLS signature data, recalculating a local commitment value, comparing the local commitment value with a vector commitment value to confirm content integrity, and judging data admission only after the dual verification is passed; and in response to a data request of a data user for a target data item, obtaining the original data, the digital signature and the Merkle member proof corresponding to the target data item based on the Merkle DAG data structure, generating a verifiable object, and returning the verifiable object to the data user. The block chain oracle machine is introduced as a trusted data space access data connector, and verifiable access and traceable circulation of data resources are realized by constructing a trusted bridging link among the data resources, the block chain oracle machine data connector, the block chain account book and the trusted data space.

This invention relates to the field of secure arraying technology for intelligent nodes, and discloses a lightweight secure arraying method for mobile intelligent nodes. The method includes: a system initialization phase generating elliptic curve formula parameters and an IPFS public key set; a public key validity verification phase using Groth16 zk-SNARK for efficient proof of anonymous public key ownership; a cross-domain authentication phase generating a one-time temporary regional identifier and updating the IPFS set; a signature generation phase employing a short-ring signature algorithm to construct an aggregated signature to support efficient batch signature verification; and a traceability phase extracting traceable factors to locate the true signer. This invention balances node anonymity, lightweight design, and traceability, making it suitable for resource-constrained scenarios such as connected vehicles and the Internet of Things.

The embodiment of the application discloses a kind of vehicle ad hoc network efficient aggregation anonymous verification method and related device, the method is verified based on the freshness of time stamp first, guarantee the freshness of time stamp from source;Then the validity of single signature is verified one by one, eliminate received invalid signature;Finally, aggregate signature verification is carried out, and the overall validity of all signatures can be verified by once bilinear pairing operation, compared with the verification of traditional method one by one, multiple bilinear pairing operations are needed, and the calculation complexity can be reduced.In high concurrency scene, processing delay is shortened from seconds to hundreds of milliseconds, which can effectively solve the problem of low efficiency of dynamic message authentication in Internet of Things, especially in vehicle networking, and meet the real-time demand.In addition, the application also introduces the smart contract and distributed digital identity verification technology of block chain, which can prevent malicious attacks of Internet of Things virus or node, and it is particularly important to improve privacy protection and prevent privacy leakage.

The invention discloses a Byzantine fault-tolerant improved consensus protocol implementation method and system based on layering and pipeline, and the method comprises the following specific steps: S1, a preparation stage PREPARE: a master node generates and broadcasts a new proposal Bv, and after a common node votes and accepts, a group leader collects a signature and aggregates the signature into a partial aggregation signature, and then sends the partial aggregation signature to the master node; s2, pre-submission stage PRECOMMIT: after aggregating a set number of preparation votes, the main node generates and broadcasts a pre-submission message; after the common nodes vote and approve, the group leader collects and partially aggregates signatures again, and then sends the signatures to the main node; s3, COMMIT in a submission stage: after the main node aggregates a set number of pre-submission tickets, broadcasting a final submission message; and the common node submits the block after verification, and jointly triggers the view to be switched to the next main node. Through the aggregation signature technology, the communication complexity is reduced, signature aggregation is changed from original leader aggregation to excitation node primary aggregation and leader secondary aggregation, and the verification process is accelerated.

Various aspects of the technologies described herein relate to systems, methods, and machine-readable media for cross-chain communication on a blockchain platform. Various aspects may include accepting a first transaction, comprising a message and a message payload, on a first blockchain. The aspects may also include verifying a message on the first blockchain by signing the message using the signing keys of one or more validators in a first set of validators on the first blockchain. The aspects may also include generating an aggregate signature based on the signing keys of one or more validators in a first set of validators. The aspects may also include submitting a second transaction, comprising a message and an aggregate signature, on a second blockchain. The aspects may also include verifying the second transaction on the second blockchain based on a shared registry.

The application discloses a kind of carbon footprint data revision request verification method and device, belong to data management technical field. Including: in response to the revision request of carbon footprint data from multiple authorized units, obtain the independent attribute signature of multiple authorized units respectively;According to the independent attribute signature of multiple authorized units respectively, verify whether all attributes that each authorized unit possesses include multiple preset core attributes;In the case where all attributes that each authorized unit possesses include multiple core attributes, the independent attribute signature of multiple authorized units is aggregated into corresponding aggregate signature;The validity of aggregate signature is verified, and in the case where aggregate signature passes validity verification, the revision operation corresponding to revision request is executed on carbon footprint data.The method provided by the application significantly improves the verification efficiency in the multi-agency collaborative authorization scenario through the aggregation signature and batch verification mechanism.

This invention relates to the field of water supply supervision. By collecting water meter pulse counting data and environmental parameters, it achieves data standardization and temperature compensation, and generates metering metadata with timestamps, cumulative values, and checksum tags based on the ISO / IEC 14882 standard. On this basis, a sliding window LSTM model is used to identify water use behavior categories and associate them with knowledge graph nodes of regulatory intent, achieving a semantic mapping between behavior and regulatory rules. Combined with blockchain technology, verifiable semantic commitments and evidence certificates are generated through hashing, Merkle root authentication, and aggregate signatures, supporting permission auditing and on-chain traceability based on SNARK zero-knowledge proofs. The system also incorporates feedback data from regulators and uses graph neural networks to dynamically optimize the behavior confidence threshold. This technical solution effectively ensures the data integrity, compliance, and regulatory transparency of water use behavior, enhancing the intelligence and traceability of the water audit system.

The application provides a kind of based on encoding's collaborative signature method and system, the method includes: initialization center generates and distributes global public key and private key component according to cryptographic parameter, each signature participant receives the message to be signed after, based on chameleon hash function according to the message to be signed, global public key and private key component, generate the signature information of each signature participant, signature aggregation party carries out aggregation processing to the signature information of each signature participant, obtains signature set, according to global public key, signature set and the identity information of signature verification party, generate the signature set to be verified, signature verification party according to the identity information of itself, global public key, the message to be signed and the signature set to be verified carries out verification processing, and according to the verification result determines whether to receive signature set.Not only can reduce the interaction times of participant in collaborative signature process, but also can greatly reduce signature size, reduce the burden of multi-party communication, and improve overall signature efficiency.

The application belongs to the technical field of computers, and particularly relates to an intelligent networked vehicle data credible traceability system and method based on a distributed ledger, which comprises a trusted execution environment module, a group aggregated signature module, a chain decentralized storage network and a distributed ledger, and realizes whole-link credibility measurement of vehicle-end data from the beginning of generation, breaks through the bottleneck of linear growth of signature verification calculation amount, and still maintains efficient operation under the scale of one million vehicles, and provides data traceability ability with legal effect for traffic accident responsibility determination, insurance claim settlement and other scenes.

The invention provides a microgrid block chain rapid transaction method based on optimized PBFT. The method comprises the following steps: firstly, collecting transaction history and output stability parameters of distributed energy nodes (DERs) in a microgrid, and establishing a dynamic credit scoring model; then, a verifiable random function is utilized to elect a consensus leader from candidate nodes, and a safety access mechanism adapting to topological changes is formed; and the leader node generates a variation Schnorr signature in combination with the electric energy transaction data and the state timestamp of the power distribution network, and transmits the variation Schnorr signature in the logic fragment through multicast. And verifying the replica node, generating a partial signature and aggregating the partial signature to realize message compression. And finally, verifying the aggregated signature in batches, updating the credit score and asynchronously caching the block. According to the method, communication congestion and delay of the PBFT in high-frequency transactions are relieved, and the system throughput and scheduling stability are improved.

The application discloses a kind of network information security processing method and system based on blockchain, comprising the following steps: collecting security event source data in network environment and carrying out analysis, generate security processing abstract information;Security processing abstract information is encoded into security state vector;Security state vector generates KZG commitment, gets commitment value, and generates corresponding open proof, collectively encapsulated as HotStuff candidate proposal;HotStuff candidate proposal is sent to different verification node, and signature vote is generated for security processing abstract information;The signature vote that satisfies legal quantity requirement is executed BLS aggregate signature processing, and generates aggregate legal certificate;Commitment confirmation is executed, and chain security processing record is formed;Chain security processing record in blockchain account book is read, target field is verified, and security processing result is output.The application improves the trusted confirmation ability of network information security processing result.

The invention provides an identity-based distributed multi-layer aggregation signature method, which is applied to a system comprising a main node and a plurality of sub-nodes, and comprises the following steps: any sub-node sends a first key generation request to the main node, and the first key generation request comprises identity information of the sub-nodes; the main node responds to the first secret key generation request and carries out secret key extraction based on the identity information of the child nodes so as to obtain a first private key-public key pair based on the identity information of the child nodes and send the first private key-public key pair to the corresponding child nodes; the child node aggregates and signs the message based on the first private key-public key pair. In addition, any sub-node can respond to the key generation request of the corresponding secondary sub-node according to the process based on the private key-public key pair of the sub-node. According to the method, the expandability of a key distribution strategy is ensured by using an identity-based public key system, and the calculation and communication burden of large-scale signature and verification is reduced by means of an aggregation signature technology.

The invention discloses a low-altitude Internet of Things bidirectional anonymous authentication method based on a BLS aggregation signature. The method comprises the steps that a trusted mechanism generates and discloses bilinear pairing system parameters; the unmanned aerial vehicle registers with a ground control station to obtain a public and private key pair based on a BLS algorithm and an initial dynamic pseudonym with timeliness; the unmanned aerial vehicle generates a BLS signature for the authentication message by using the current dynamic pseudonym and the private key and broadcasts the BLS signature; the ground control station executes aggregation verification on the received at least one BLS signature, and verifies the validity of all signatures at one time; the two parties complete bidirectional authentication after the verification is passed; and after the authentication session ends, the unmanned aerial vehicle updates the dynamic pseudonym without mathematical association between the new and old pseudonyms. According to the method, the calculation complexity of batch verification is reduced to a constant level through the BLS aggregation signature, and the authentication delay in a high-concurrency scene is remarkably reduced; and intersession linkability is cut off through a dynamic pseudonym updating mechanism, and identity and track privacy protection is realized.

This invention discloses a data asset management method and system based on distributed ledger technology, relating to the field of distributed ledger technology. The method includes: triggering a dynamic evaluation smart contract based on an ownership certificate to generate a dynamic valuation matrix through a federated learning model and an off-chain network; inputting the dynamic valuation matrix into a cross-chain gateway to perform atomic binding operations, and deploying a dynamic token contract on the target chain to output a token certificate; driving a cross-chain transaction engine to process the token certificate through an authentication blockchain protocol to generate a transaction certificate containing a quantum-resistant aggregate signature; and using the transaction certificate to activate a monitoring smart contract to analyze asset state parameters in real time and output adaptive rebalancing instructions. This invention ensures the atomicity of cross-chain transactions in quantum-resistant signature verification, dynamic valuation validity consensus, and automatic fee allocation through an improved hash time-locking protocol and a three-dimensional time window state machine.

This invention belongs to the field of blockchain and distributed system technology, specifically providing a Byzantine fault-tolerant RAFT consensus method based on a deputy leader and threshold BLS signatures. The method includes: fixing a trusted authorizing institution as the deputy leader, which coordinates the collection, normalization calculation, and score broadcasting of performance indicators from all follower nodes, providing a performance basis for election; after a follower's heartbeat times out, it becomes a candidate and initiates an election request to the deputy leader; the deputy leader generates and divides signature shares using the threshold BLS signature system, generates commitment values ​​for each share using the Pedersen commitment scheme, and distributes them; after a candidate initiates a voting request, each node returns its share after multi-dimensional verification; the candidate collects sufficient shares to generate an aggregate signature and submits it to the deputy leader; the deputy leader completes the final verification and decision and broadcasts the leader confirmation message; after all nodes in the network synchronize and update their roles, the new leader leads the heartbeat and log synchronization. This solution ensures the performance reliability of the leader node, improves the cryptographic security of the election signature, standardizes and simplifies the election process, effectively improves the efficiency, fault tolerance, and overall availability of the distributed system consensus process, and adapts to the application needs of large-scale heterogeneous node distributed systems.

A method for performing identity authentication on an account in a block chain system comprises the steps of obtaining a first transaction comprising a zero knowledge proof and a first root hash, a public input of the zero knowledge proof comprising a first account address, an authentication item public key subset and a first signature, the zero-knowledge proof is used for proving that the first root hash is calculated based on first secret data input by a first user, the first signature is an aggregate signature of sub-signatures corresponding to an authentication item public key subset, and each sub-signature is generated by signing a first certificate of the first user by an identity authentication mechanism; the authentication item public key corresponds to an identity authentication item. Under the condition that the zero-knowledge proof passes verification and the first root hash is the same as a second root hash stored in the block chain system, the first signature is verified, and the second root hash is uploaded by an identity authentication mechanism and is a root hash of an authentication Merck tree; and under the condition that the verification is passed, determining the passed identity authentication item of the first account address according to the authentication item public key subset.

The invention discloses a certificateless aggregation signcryption method for emergency communication, an emergency communication system and a computer readable storage medium, and belongs to the technical field of information security. The signcryption method comprises the steps of system initialization, pseudonym generation, partial private key generation, secret key generation, signcryption, unsigncryption and batch verification. According to the method, the user identity, the public key, the message and the timestamp are strongly bound through the hash function, the public key replacement attack and the replay attack are effectively resisted, and the protection of the malicious key generation center is realized; meanwhile, a batch verification mechanism is introduced in the scheme, multiple ciphertexts can be verified at a time, and the calculation overhead is remarkably reduced; according to the scheme, on the premise that confidentiality, unforgeability, traceability, integrity, non-repudiation, mutual authentication and non-linkability are guaranteed, calculation and communication cost is low, and the method is particularly suitable for a post-disaster emergency communication scene composed of a detection unmanned aerial vehicle, a relay unmanned aerial vehicle and a ground station.

The application provides an electronic evidence storage method and system, an electronic device and a storage medium, wherein the method comprises: acquiring public information, a registration table and a credit list library, the registration table is used for storing real and pseudonymous identities of electronic evidence, and the credit list library is used for storing credit identifiers of users; calculating blind aggregate signatures of a plurality of electronic evidences of any user according to the public information, the registration table and the credit list library; verifying the blind aggregate signatures; and uploading the verified blind aggregate signatures to a new block of a first block chain. Through the application, the problem of low storage efficiency of electronic evidence on a block chain in the related art is solved.

The invention provides a coding-based collaborative signature method and system, and the method comprises the steps: an initialization center generates and distributes a global public key and a private key component according to a cryptographic parameter, and after receiving a to-be-signed message, each signature participant carries out the coding of the to-be-signed message according to the to-be-signed message, the global public key and the private key component based on a chameleon hash function; generating signature information of each signature participant, performing aggregation processing on the signature information of each signature participant by a signature aggregation party to obtain a signature set, generating a to-be-verified signature set according to the global public key, the signature set and the identity information of the signature verification party, and verifying the to-be-verified signature set according to the to-be-verified signature set. And the signature verification party performs verification processing according to the identity information of the signature verification party, the global public key, the to-be-signed message and the to-be-verified signature set, and determines whether to receive the signature set according to a verification result. According to the method, the interaction times of participants in the collaborative signature process can be reduced, the signature size can be greatly reduced, the multi-party communication burden is reduced, and the overall signature efficiency is improved.

A method for signing a message mi, by a user device, from a zero-knowledge proof cryptographic protocol defined by an element g belonging to a group G1 of order p, with p designating a prime integer, and elements u, v, r, s, t belonging to a group G2, a hash function H and a current time period w. The method includes: a generating a pair of private and public keys, the private key including an element αi selected from the ring Z / pZ, the public key including a first element and a second element being a zero-knowledge proof of possession generated from the cryptographic protocol; and generating a signature σi of the message mi from the private key and a random variable 6, the signature including a first element σ1i and a second element σ2i.

The invention relates to the field of data processing, and provides a transaction evidence analysis method, device and equipment, a medium and a computer program product, and the method comprises the steps: determining public and private keys and target evidence based on a consistency verification request sent to a verified node; determining a signature of the target evidence according to the consistency verification request, the public and private keys and a hash root; the hash root is determined based on the target evidence; determining the data integrity of the verified node according to a comparison result of the local aggregation signature and the response aggregation signature; the response aggregation signature is obtained by aggregating the signature of the target evidence; and under the condition that the verification of the data integrity is not passed, determining the damaged data location of the verified node based on the comparison result. Through the data consistency verification process and the data damage positioning method, accurate judgment of transaction data integrity and accurate positioning of damaged data are improved.