53 results about "Aggregate signature" patented technology

A method and system for generating and verifying a monotone policy aggregate signature σf a message. The method involves storing a common message at a local storage device, generating a signature for the common message using a secret cryptographic key at a local signature generation module, and transmitting the user signature to an aggregator module. The aggregator module combines the user signature with other user signatures to generate an aggregate signature. The aggregate signature is then transmitted to a verification module for verification. The monotone policy aggregate signatures are constructed from non-interactive batch arguments that support adaptive subset extraction for expressive monotone policies.

The invention relates to a bank-enterprise direct connection scene-oriented revocable security signcryption method, and belongs to the field of information security. According to the method, digital signature and encryption are deeply coupled in a single logic step, so that the calculation complexity is reduced, and the requirements of confidentiality, integrity and non-repudiation of information transmission in a financial scene are met; and meanwhile, a key updating mechanism is designed, so that access blocking of the history and the newly-added ciphertext after permission revocation is ensured. In order to solve a subversive attack possibly initiated by an internal opponent, a password reverse firewall architecture is introduced, an encrypted ciphertext is reconstructed through a re-randomization module, and algorithm risks possibly caused by tampering of a random number generator are blocked. A block chain intelligent contract and aggregation signature technology is further introduced, a fair and reliable decentralized verification platform supporting batch verification is constructed for bank and enterprise users, the cloud verification efficiency is improved, and responsibility tracing can be performed through records on the block chain when major property safety accidents occur.

The invention discloses a smart tea garden block chain traceability system and method, and the method comprises the following steps: carrying out the standardization processing and aggregation of data of each link, and generating an event set identifier; performing compact commitment on the event set by adopting an RSA accumulator to generate a staged commitment value; introducing a BLS threshold signature mechanism, and performing joint signature on the event set by a plurality of trusted nodes to generate an aggregation signature; binding and writing the commitment value and the aggregation signature into a block chain; in traceability query, the existence of events is verified through an RSA accumulator, and node consensus is verified through a BLS threshold signature, so that a safe, transparent and verifiable traceability system is constructed. The system covers the whole process information management of tea from planting, processing, storage, transportation to sales.

The invention discloses a security time-limited verifiable and traceable threshold signature method and system. The security time-limited verifiable and traceable threshold signature system comprises a plurality of signer modules, an aggregator module, a tracker module and a notarist module, wherein the signer module signs data to obtain signature fragments, constructs a time lock puzzle and a commitment, processes the data and correspondingly sends the data to an aggregator, a tracker and a notarization person; after receiving the data, the aggregator module processes the data to obtain an aggregation signature, constructs a proof and a commitment, and sends the data to the tracker module; after receiving the data, the tracker module applies for a token, decrypts the data by using the token, and tracks the data to obtain a signer sequence after verification is passed; and after receiving the application, the notarist module gives a token, and if the aggregator does not perform correct aggregation within the specified time, the notarist processes related data and recovers an aggregation signature. According to the method, the privacy and the traceability of the threshold signature are considered while the security time limit can be verified and traced.

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.

To provide a communication system capable of minimizing an amount of signature data.SOLUTION: When a signature system is a one-to-one signature system, each of the terminal devices 5 to 7 transmits a data msg detected by itself, identification information id of itself, a signature system type, and the tag tag generated by signing the data msg and the identification information id using a one-to-one signature key to a gateway 3, and the gateway 3 transmits [msg, id, type, tag] received from each of the terminal devices 5 to 7 to a server 1. When the signature system is an aggregate signature system, each of the terminal devices 5 to 7 transmits [msg, id, type, tag' (=tag generated by signing using the aggregate signature key)] to the gateway 3, and the gateway 3 transmits the aggregate tag a_tag and [msg, id] generated by signing msg, id, tag' using the aggregate signature key to the server 1.SELECTED DRAWING: Figure 1

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 present invention provides a heterogeneous aggregate signature system for a verification center, comprising: the verification center obtains a signature sequence (ID i ,m i ,R i ,S i ,T i ), calculate the ID i is the identity information of each signing terminal; m i is the message to be encrypted; T i is the timestamp; S i is the characteristic code of each signature terminal; R i =r i P, r i The parameter is randomly selected by each signing terminal; the equation is calculated and verified based on the signature code of each signing terminal type. If true, the signatures of n user terminals are verified successfully. This invention provides a system that, by rationally setting signature codes for aggregated verification, enables heterogeneous signing terminals to sign based on their respective public key systems, with the verification center then performing unified aggregated verification. This reduces the verifier's system initialization and signature verification overhead, and provides signature and authentication services for users of different cryptographic systems.

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 discloses an updatable signature method for detecting a forged signature, and mainly solves the problem that an attacker forgery a signature and uploads the signature to a cloud server in an updating gap in the prior art, and the problem that the server and the attacker collude. The method comprises the following steps of: after a signer signs a message, carrying out aggregation operation on an obtained signature and an aggregation signature; the signers negotiate a secret value with the server, respectively use the secret value to calculate an update token, and then the signers use the update token to update the secret key and sign; after the verifier verifies the signature, the server detects and removes the forged signature, and then updates a message-signature pair stored in the server; the signer checks whether the server colludes with the attacker. According to the method, the aggregation signature technology is used in the signature process, detection and removal of forged signatures are achieved, and the protection level of a cloud service system is greatly enhanced.

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

A consensus method, system, and consensus node. The method includes: determining a consensus node within a consensus group initiating a consensus proposal in a current round of consensus based on a random number from a previous round, the determined consensus node initiating the consensus proposal; each consensus node within the consensus node group signing the consensus proposal using its own first private key share in a threshold signature algorithm to generate a first signature share, and broadcasting the first signature share to other consensus nodes within the consensus group; consensus nodes that have collected a threshold number of first signature shares using a first recovery function in the threshold signature algorithm to recover a first aggregate signature, and broadcasting the first aggregate signature and the corresponding first aggregate public key to a blockchain network; blockchain nodes that have received the first aggregate signature and the first aggregate public key verifying the first aggregate signature using the first aggregate public key, and upon successful verification, determining the consensus proposal corresponding to the first aggregate signature as the current consensus result.

The invention discloses a log synchronization method, system and device and a medium, and relates to the technical field of block chains. The method of the main node comprises the following steps: acquiring a request message sent by a client, and performing validity verification on a signature of the client; in response to the fact that a first verification result of the client signature is valid, adding the request message to a main node account book, and broadcasting a log entry with the request message to all slave nodes, so that each slave node feeds back a part of signature to which the slave node belongs; generating an aggregated signature according to the signatures of all the parts; generating a zero-knowledge proof according to the request message; broadcasting the aggregated signature and the zero-knowledge proof to each slave node, so that each slave node performs validity verification on the log entry, the aggregated signature and the zero-knowledge proof, and feeds back a second verification result; and according to each second verification result, submitting the log entry and broadcasting a log copy message, so that each slave node copies the log entry into a slave node account book. According to the scheme, the safety of the distributed system is improved.

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 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 invention provides a data aggregation method and device, and the method comprises the steps: an edge gateway carries out the aggregation operation of data from a plurality of data producers, and generates an aggregation signature, the data is a ciphertext which is encrypted and digitally signed by the corresponding data producers, and the aggregation signature is generated by the edge gateway; by means of the data aggregation method and device, the problem that an existing industrial internet data aggregation scheme is not comprehensive in consideration in the aspect of data storage safety is solved, and then the privacy and integrity of the data are guaranteed.

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 application relates to a signature-based set semantic similarity connection method, and belongs to the fields of databases and information retrieval. The method comprises four parts: firstly, a classification tree construction step: a classification tree is constructed according to a WordNet knowledge base given a data set; secondly, a set signature step: each set in the data set is signed to obtain a corresponding signature data set; thirdly, a data preprocessing step: the sets in the signature data set are sorted to obtain a sorted data set; and finally, a connection processing step: self-connection is performed on the sets in the sorted data set to obtain a set of semantic similarity results. The method is based on signature prefix filtering technology and length filtering technology, and finally realizes the set semantic similarity connection method, so that the set semantic connection efficiency can be effectively improved.

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

The present invention provides a VANET privacy protection method based on certificateless aggregate signatures to protect against collusion attacks, relating to the field of in-vehicle network security technologies. Specifically, the method comprises: constructing a VANET privacy protection model based on certificateless aggregate signatures to protect against collusion attacks, comprising a vehicle equipped with an onboard unit (OBU), a roadside unit (RUU), an application server, a key generation center (KGC), and a trusted institution; wherein the RBU is primarily responsible for aggregating vehicle signatures and transmitting them to the application server; the application server is primarily responsible for verifying the validity of the aggregate signatures and detecting whether the VANET has been attacked by collusion, and sending invalid aggregate signatures that fail verification to the trusted institution; the KGC is primarily responsible for generating partial private keys for the vehicle; and the trusted institution is primarily responsible for providing registration services for the RBU and the vehicle and generating a pseudonym for the vehicle, thereby using the vehicle's pseudonym to reveal the true identity of an illegal signature from the application server.

The embodiment of the invention discloses a transaction processing method and device, equipment and a medium, which can be applied to various scenes such as intelligent traffic, auxiliary driving, cloud technology and artificial intelligence. The transaction processing method comprises the following steps: acquiring transaction data of transactions initiated by a transaction initiator for a plurality of decentralized applications, wherein the transaction data comprises aggregated signature data obtained by aggregating signature data corresponding to the plurality of transactions respectively; calling an aggregation signature verification smart contract based on the smart contract corresponding to the smart contract account of the transaction initiator, and verifying the aggregation signature data; if the verification of the aggregated signature data is passed, calling a decentralized application smart contract of each transaction based on a smart contract corresponding to a smart contract account, executing each transaction, and obtaining an execution result of each transaction; and sending the execution result of each transaction to the transaction initiator. According to the technical scheme, the transaction processing efficiency is improved, and the transaction processing scheme is perfected.

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.

The invention relates to a signature-based set semantic similarity connection method, and belongs to the field of databases and information retrieval. Comprising four parts of contents: firstly, a classification tree construction step: giving a data set, and constructing a classification tree according to a WordNet knowledge base; secondly, a set signature step: signing each set in the data set to obtain a corresponding signature data set; then, a data preprocessing step: sorting the signature data set to obtain a sorted data set; and finally, a connection processing step: performing self-connection on sets in the sorted data sets to obtain a semantic similar result pair set. Based on the signature prefix filtering technology and the length filtering technology, the set semantic similarity connection method is finally realized, and the set semantic connection efficiency can be effectively improved.

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.