119 results about "Multisignature" patented technology

The invention discloses a multi-signature transaction information processing method for a data transaction platform based on a block chain. Each of a buyer and a seller generates a transaction key pair at self client, and the data transaction platform generates and distributes a single transaction key pair for each transaction process; the seller releases data to be transacted on the block chain via the data transaction platform; after the buyer submits a transaction application, an intermediate address is generated according to a three-party public key, money is transferred to the intermediate address after payment, and the seller receives the money, writes the money into the block chain, then encrypts data and sends the encrypted data to the buyer; after the buyer receives the data, if transaction is acknowledged, the double parties sign, and the money is transferred to the address of the seller; and if objection exists, the data transaction platform makes a judgment, and determines to transfer the money to the buyer or the seller according to the judgment result. Data and transaction information during transaction of the double parties are processed in a special regional chain manner, and meanwhile, the data transaction platform cannot embezzle the transaction money, so that the security of digital assets during transaction is further guaranteed.

The invention discloses a method and a device for generating a signature, a terminal and a server, and belongs to the technical field of information. According to the method, an aggregated signature is generated via sub-signatures of a plurality of signature parties, and an aggregated public key is generated based on public keys of the plurality of signature parties, so that the length of the acquired aggregated signature is less than that of a multi-signature acquired by splicing the plurality of sub-signatures, the length of the aggregated public key is less than that of a multi-public key acquired by splicing the plurality of public keys, and thus when the aggregated signature and the aggregated public key are transmitted via a network, the network transmission load is reduced, the storage space is saved when in storage, when the signature is verified, the aggregated public key and the aggregated signature are directly used for verifying a message to be signed, and the complexity ofsignature verification is greatly reduced.

A method of generating a keyless digital multi-signature is provided. The method includes receiving multiple signature generation requests from one or more client computers, building subtrees based on the signature generation requests, and constructing a search tree including the subtrees. The method also includes assigning explicit length tags to leaf nodes of the search tree to balance the search tree and applying a hash function to each of the search tree nodes. The root hash value and the height of the search tree make up a generated aggregate signature request, followed by receiving an aggregate signature based on the aggregate signature request. The keyless digital multi-signature is generated based on the aggregate signature and contains an implicit length tag to verify that the number of signature generation requests is limited. The aggregate signature is generated if the height of the search tree does not exceed a predetermined height limitation.

The present invention discloses a blockchain-oriented key management method, which is used for initial allocation, management and loss recovery of the key. The method comprises the following steps: before starting the application, allocating two pairs of keys for each user who joins the blockchain, and generating a pair of backup keys at the same time in a key management center (platformer side);setting weights for the master key pair, the secondary key pair, and the backup key pair respectively; and defining a multi-signature verification script for the blockchain transaction process. In practical applications, the method can be further extended to multiple platform and multi-mode weight checks. According to the blockchain-oriented key management method disclosed by the present invention, a set of solutions for key recovery, asset recovery, and multi-user rights management after the loss of the key in a blockchain application are proposed, the problems that key recovery and the difficulty in finding or recovering the assets in the case of key loss can be effectively solved, bigger problems and loopholes in the existing key management mechanism in the blockchain application are made up, and normal use for users can be facilitated.

Methods and systems are provided for generating and verifying signatures of digital messages communicated between signers and verifiers. Using bilinear mappings, such as Weil or Tate pairings, these methods and systems enable generation and verification of efficient multisignatures, identity-based ring signatures, hierarchical proxy signatures, and hierarchical online / offline signatures.

The systems and methods on a blockchain platform for one or more intermediaries for services including proxy re-encryption, independent audit, multiple-signatures based smart wallet associated with a smart contract and split-key authentication to achieve secure passwordless login. Proxy re-encryption by receiving a ciphertext from a first user with condition parameters that has been encrypted with a dynamically selected encryption algorithm. Audit service receiving an encrypted file from a user for storage on the blockchain platform; enforcing the security policy parameters for all access requests to the file on the blockchain platform; and optionally providing audit report of the encrypted file storage and access. A smart wallet with a group key using multiple signatures based on receipt of a threshold number of signatures. Split-key authentication by splitting the private key into two or more parts; and assigning the split private key part to two or more client devices.

The embodiments described herein comprise hardware and software improvements in blockchain-asset exchange technology, whereby one or more servers automatically, based on a set of predetermined rules,executes a mechanism allowing blockchain-asset exchange customers to place standing-limit or market orders for blockchain-based digital assets (e.g., cryptocurrencies) with a counter-party, but without counter-party risk. The counter-party will not receive the payment until the customer's exchange order has executed, and the customer has taken possession and ownership of the desired asset. The customer cannot reverse payment or otherwise rescind the payment from the counter-party once the customer receives the desired asset. The systems and methods use blockchain databases, multi signature keysigning procedures, and a transparent, objective, automated, rules-based software agent to manage and autonomously govern transfer of digital blockchain-based assets in a multi-party exchange scenario, without risk of asset loss and without the discretion of any human actor.

Methods and systems are provided for generating and verifying signatures of digital messages communicated between signers and verifiers. Using bilinear mappings, such as Weil or Tate pairings, these methods and systems enable generation and verification of efficient multisignatures, identity-based ring signatures, hierarchical proxy signatures, and hierarchical online / offline signatures.

The invention relates to a micro-blog multi-signature method based on a chain block. The method comprises the following steps: 1, performing user registration to obtain a pair of public key and private key and an address for transaction and generated by the private key; 2, creating multi-signature addresses by m users by using the addresses obtained in step S1; 3, creating micro-blog sending transaction, and inserting to-be-sent information in the transaction by using an OP-RETURN operator, wherein the OP-RETURN operator is operated by the multi-signature addresses created in step S2, the multi-signature addresses support the authority of n of m; and 4, performing digital signature on the micro-blog transaction by the users onsite in turns, and broadcasting the micro-blog transaction after at least n signatures are obtained, and permanently recording the micro-blog transaction in the block chain after the success of the transaction. The micro-blog multi-signature method has the advantages of not worrying about tampering and deletion of the micro-blog, generating no advertising push, and having high security and high information credibility, etc.

A multi signature verification system adds new additional data to original data with a signature attached thereto and verifies validity of the original data and the additional data. The system includes an electronic signature attaching apparatus including an electronic signature attaching unit attaching an electronic signature to original data previously created, acquired trapdoor hash value, and identification information, a data addition apparatus, and an electronic signature verification apparatus.

Provided is a virtual currency generation apparatus including a blockchain generator configured to generate a blockchain including a virtual currency that is generated based on a credit limit of a consumer and to update the blockchain based on payment details; an account manager configured to manage multi-signatures of a plurality of accounts sharing the blockchain; and a transaction generator configured to store a transaction condition corresponding to each of the plurality of accounts and to proceed with a payment using the virtual currency based on the transaction condition.

The invention discloses a method for efficiently carrying out cross-chain information transaction interaction in a block chain. The first blockchain node needing cross-chain transaction sends a firstdigital asset to the first cross-chain smart contract; if the anchoring node group monitors that the cross-chain information is linked, multiple signatures are carried out and published; the other blockchain nodes select the first digital assets to receive according to the public information, transfer the second digital assets into a second cross-chain smart contract, and obtain the second digitalassets by the first blockchain node after the uplink confirmation; after the anchoring node group monitors uplink confirmation of the received information, information transferred to the receiving node by the first digital asset is generated and signed; and the first cross-chain transaction contract transfers the first digital asset to the receiving node after obtaining the signature of the anchoring node, and the receiving node obtains the first digital asset after confirmation. According to the invention, the cross-chain transaction is realized through the anchoring node and a multi-signature mode, and two transaction parties can efficiently complete the cross-chain information interaction only through one-time initiating and receiving operation.

The invention discloses a 5G unmanned aerial vehicle cross-domain identity authentication method and system based on a block chain, and a terminal, and relates to the technical field of unmanned aerial vehicles, and the key points of the technical scheme are as follows: initiating a transfer transaction with additional information as a communication connection request; sending an identity authentication request to an alliance chain according to the communication connection request; the alliance chain calls a built-in intelligent contract to search access control information and a registration validity period of domain A equipment according to the identity authentication request; performing hash processing on an identity label in the account information to obtain a second hash value, and matching the second hash value with the first hash value; and the domain B equipment performs session key negotiation with the domain A equipment according to the legal identity information and then establishes communication connection. According to the invention, the identity authentication of the cross-domain unmanned aerial vehicle in the distributed environment is realized by using the multi-signature intelligent contract, only one transaction needs to be submitted to the block chain for one-time authentication, and compared with a traditional authentication mode using a digital certificate, the identity authentication is completed with smaller communication overhead.

An authenticating server is coupled to a blockchain network is configured to: (1) receive a transaction application data from a user, wherein the transaction application data includes a wallet data containing a wallet address data and a user's signature data; (2) check whether an amount of a cryptocurrency corresponding to the wallet address data on the blockchain network is sufficient to perform the transaction; and (3) when the amount of the cryptocurrency corresponding to the wallet address data on the blockchain network is sufficient to perform the transaction, transmit a multi-signature wallet transaction data to the blockchain network for validating a blockchain operation, and send a confirmation data of the transaction associated with the transaction application data to an opposing party of the transaction. The multi-signature wallet transaction data includes the wallet address data, the user's signature data and a signature date of the authenticating server.

The invention discloses a multi-signature based digital currency wallet service management method and system. The system includes a contract verification server and three wallet service party terminals, each of the three wallet service party terminals holding a set of secret keys. The method includes that a wallet client terminal initiates a service request and sends the request to a wallet service provider terminal; the wallet service provider terminal and a wallet client terminal or a wallet service supervisor terminal selected according to the type of the service request perform digital signing on the service request data according to private keys held by themselves and the service request data with multiple signatures is obtained; the wallet service provider terminal sends the servicerequest data with the multiple signatures to the contract verification server; the contract verification server verifies the service request data with the multiple signatures according to a service-related contract and corresponding service processing is performed after the verification. According to the invention, the service traceability is high and the safety and reliability of digital currencyare high.

The embodiment of the invention relates to a cross-block chain asset management method and equipment, a computer readable storage medium and a computer program product. The method comprises the following steps: at the management equipment, in response to receiving a request of a user for recharging a second block chain based on a first token of a first block chain, generating a multi-signature address, and configuring the multi-signature address to allow to change associated data of the multi-signature address in response to the fact that multi-signature information of the user and the secondblock chain passes verification; generating first transaction data in response to the confirmation that the multi-token address receives the to-be-recharged first token, so as to generate second tokenfor the smart contract of the second blockchain, the first transaction data at least indicating to recharge the to-be-recharged first token from the multi-token address to the receiving address; acquiring multiple signature information of the user and the second block chain for the first transaction data; and sending multi-signature information for the first transaction data to a second block chain, so that the second block chain provides a second token for an account associated with the user in response to confirmation that the multi-signature information passes verification.

The invention relates to the technical field of blockchain cross-chain, in particular to a blockchain heterogeneous chain cross-chain transaction method, which comprises the following steps that: A) auser node S1 of a first blockchain transfers digital assets D1 to a cross-chain transaction contract, generates cross-chain transaction information and uploads the cross-chain transaction informationto a chain; b) the anchoring node group monitors cross-chain transaction information, generates transaction intermediate information and performs multiple signatures; c) transaction intermediate information is monitored by a cross-link router, the transaction intermediate information is converted into cross-link transaction information of a second block chain structure, and then the cross-link transaction information is opened; d) the user node of the second block chain selects the digital assets to receive, transfers the digital assets D2 to the user node S1, and generates cross-chain transaction receiving information; e) the anchoring node group generates transaction confirmation information; and F) the cross-link router monitors transaction confirmation information, and the digital asset D1 is sent to the user node S2. The beneficial effects of the invention are that the method avoids the centralization of the cross-chain transaction through the open anchoring node group and the cross-chain routing, and improves the safety and reliability of the cross-chain transaction.

The invention discloses a cross-chain transaction method based on multiple signatures. The cross-chain transaction method is characterized by comprising the following steps that (1) an asset account based on multiple signatures is created on an alliance block chain; (2) the user performs cross-chain asset buying and selling operation on a transaction quotation interface; (3) after the buyer and the seller of the transaction reach a consensus, the transaction matching system verifies the consensus and then sends the consensus to the cross-chain transaction system; (4) the cross-chain transaction system performs secondary verification on the transaction information, then signs the transaction to complete multiple signature operations, and finally sends the transaction information to the corresponding block chain for consensus; (5) when an abnormal transaction occurs, the cross-chain transaction system sends transaction information again for the failed transaction of the two parties, andfor the failed transaction of the single party, the alliance chain identifies the abnormal transaction and freezes the additional profit account; the additional profit-gaining user can select reversetransaction or resend failed transaction information, thereby recovering the frozen account quota.

The invention discloses a design method and a device for realizing a block chain system supporting multiple signatures. The design method comprises: receiving a first transaction, wherein the first transaction is used for deploying an intelligent contract, the first transaction at least comprises a to-be-deployed intelligent contract, a first multi-signature rule associated with the intelligent contract and a first transaction identifier, and the first multi-signature rule comprises a set first public key set, a first signature threshold value and first consensus information comprising a firstconsensus rule; deploying an intelligent contract and generating a contract address of the intelligent contract; storing a first transaction voucher, wherein the first transaction voucher comprises acontract address, a first multi-signature rule and a first transaction identifier; And returning the contract address of the smart contract. The disclosed method and device reduce the code burden ofthe smart contract to reduce the scale and complexity of a local account book, support the change of multiple signature rules on the basis of not modifying the original smart contract data, and reducethe resource consumption caused by the redeployment of the smart contract.

A blockchain cloud storage user data security solution includes four steps: step A, a client constructs a blockchain client operation environment and downloads an operation framework through an application construction unit in a PC; b, the client performs multi-signature by adopting a multi-signature technology based on zero knowledge consensus through an application unit in the client; c, the client cuts, fragments and encrypts the to-be-uploaded data through an application fragment cutting unit in the client; and step D, when the client downloads the file in the cloud storage system, whetherthe data stored in the blockchain by the client is complete and available or not is verified by adopting a Merkle tree verification method. Based on the fact that the blockchain technology has natural decentralization characteristics, the method totally adopts four steps, achieves scattered storage of data, reduces risks of data loss and complete data stealing, prevents data from being maliciously tampered by a center node, and effectively achieves the effect that cloud storage data of users is safer. Based on the above, the method has a good application prospect.

The invention relates to a multiple digital signature method based on an identity cipher mechanism. The method comprises the steps that 1 system parameters are initialized; 2 keys are generated and distributed; and 3 multiple signatures are generated and authenticated. According to the invention, the investment cost of an authentication mechanism can be reduced; the burden of certificate management is reduced; the operation efficiency of a system is improved; and the security and stability of the system are strengthened.

The invention relates to the field of information encryption, and discloses a multi-signature method, a signature center, a medium and electronic equipment, the method is executed by the signature center, the signature center comprises a signature unit and a plurality of signature participants, and the method comprises the following steps: each signature participant acquires a prime number order cyclic group under an elliptic curve equation; the signature participant receives a private key generated by the key generation center according to the identifier of the signature participant; the signature participant obtains a public key of the signature participant by using a formula based on the private key of the signature participant; each signature participant generates a random number, andthe signature unit obtains a target random point by using a formula based on the random number; and each signature participant signs the to-be-signed message based on the target random point accordingto a formula and sends the signed message to the signature unit, and the signature unit synthesizes the signed message to obtain a signature of the to-be-signed message. According to the method, thesignature security and the maintainability of the signature system are improved, the resource consumption during multiple signatures is reduced, and the signature efficiency is improved.

The invention discloses a data encryption storage method for a mimicry defense system, and the method comprises the steps that an input agent module receives a data read-write request of a user, uploads user settings to a strategy controller after the user settings are converted and packaged, and distributes the user settings to a heterogeneous cloud storage platform according to a strategy; aftercomprehensive analysis of the strategy controller, a multi-signature strategy, an encryption strategy, a fragmentation strategy and a signature authentication strategy are formulated and distributedto the heterogeneous cloud storage platform; the heterogeneous cloud storage platform performs multiple signature, fragmentation and encryption operation or recombination, decryption and authentication operation on the data according to the issuing strategy and uploads the data to the decision device; the decision device decides the signature authentication and uploads the signature authenticationto the strategy scheduler; and the output agent module processes and converts the operation information and reports the operation information to a user. According to the method, the data security isimproved, different security policies can be reasonably formulated according to different data security requirements, and the requirements of users on the data storage performance are met.

The invention provides an ordered multi-signature method based on a block chain, and the method comprises the steps: firstly a signer generates a public and private key pair for signature, and a public key serves as an address on the block chain of the signer; secondly, the data owner generates a deposite transaction, sets a deposit amount and a signature time interval, aggregates signer public keys needing to be signed and generates a signature sequence, and publishes the messages; then, each signer signs the file in sequence, signature safety is guaranteed by generating a part of public keysused for signature this time, and after signature is completed, the signature is sent to the intelligent contract and the next signer; after the intelligent contract passes the signature, the signergenerates a claim transaction through a deposite transaction, and takes back the deposit; and finally, the intelligent contract sends the final signature to the data owner. By using the aggregation public key, the signature verification time is reduced, and the fair exchange protocol based on the penalty mechanism ensures the high efficiency in the signature process.

The embodiment of the invention discloses a data sharing method and a related device, equipment and system. The data sharing method comprises the following steps of: sharing data, the first node or the proxy node of the first node receives a sharing request for indicating to share the target data to n nodes in the blockchain network, generates a first multiple signature address according to the public keys of at least n nodes, and encrypts the target data through the first multiple signature address to obtain first transaction data; and then, uploading the first transaction data to a blockchain network, and after receiving the first transaction data, the n nodes decrypt the first transaction data according to at least i private keys included in the private keys of the at least n nodes to obtain target data. According to the method, a fair and supervisable data sharing mode is provided, the data sharing process is transparent and fair, and the safety of the shared data can be improved and protected.

The invention discloses a multi-signature flexible blockchain payment method and device and electronic equipment. The multi-signature flexible blockchain payment method comprises the steps of storingto-be-allocated digital assets sent by a sender into a multi-signature address of a blockchain so as to open a flexible payment channel; obtaining at least one piece of allocation information allocated by the sender, and generating at least one corresponding reallocation flexible payment signature according to the at least one piece of allocation information; and flexibly paying the to-be-allocated digital assets to a corresponding account according to the at least one reallocation flexible payment signature. According to the method, two parties can realize flexible payment without a need of directly establishing a flexible payment channel through sending the to-be-allocated digital assets to the multi-signature address of the blockchain and establishing a flexible payment network, therebynot only effectively ensuring the reliability and safety of payment, but also having the advantages of low payment cost, short confirmation time, high flexibility and the like, effectively improvingthe user experience and being simple and easy to implement.

The invention discloses a certificateless multivariable broadcast multi-signature method. The method comprises the steps of establishing system parameters, generating part of keys, generating signature keys, performing signing and performing verifying. The invention provides a certificateless multivariable broadcast multi-signature method by combining a certificateless public key cryptosystem anda broadcast multi-signature technology under a multivariable public key cryptosystem, and the method solves the problem of key hosting of the identity-based public key cryptosystem. The final multi-signature length is irrelevant to the number of signers, the verification time of the multi-signature is consistent with the verification time of a single part of signature, and the method has the advantages of signature, small verification calculation amount, quantum computing attack resistance and the like, and can be applied to the fields of vehicle-mounted networks, education systems and the like.

The invention provides a multi-signature transaction method and device, and a storage medium. The method comprises the following steps: generating a first multi-signature transaction, wherein the signature information of the first multi-signature transaction comprises a multi-signature identifier, a first public key of each first account capable of managing a transaction initiator of the first multi-signature transaction, and a multi-signature judgment rule capable of successfully executing the first multi-signature transaction, by the plurality of second accounts, signing the transaction content of the first multi-signature transaction according to the held private keys to obtain first signature data, and sending the first multi-signature transaction to a blockchain network, so that the blockchain node judges whether each piece of first signature data in the signature information conforms to a multi-signature judgment rule or not, and if so, executing the first multi-signature transaction. According to the invention, the service fee for generating the multi-signature transaction is reduced, and the multi-signature scene is suitable for all asset types.

The invention provides an anonymous multi-signature method, computer equipment and a storage medium. The method comprises the following steps: generating a first repeated verification hash according to a second private key and a first ID; taking the first ID, the first repeated verification hash and the root of the first Merkel tree as public input of a circuit certification algorithm, and taking the second private key, the second address and the path information as private input to generate first certification information; generating a first anonymous multi-signature transaction comprising the first ID, the first repeated verification hash, the tree root and the first certification information, sending the first anonymous multi-signature transaction to the block chain network for execution by the node, and inputting each item of second repeated verification hash, the verification parameter, the first ID, the first repeated verification hash, the tree root and the first certification information into a circuit verification algorithm for verification; if yes, storing the first repeated verification Hash into the contract, and judging whether the number of the repeated verification Hash accords with a verification threshold or not; if yes, determining that the multi-signature verification succeeds. According to the invention, anonymous multiple signatures on the block chain are realized.

The invention discloses a digital signature and signature verification method, system and device and a storage medium. The system comprises: a secret key generation processing module which is used for generating a user signature root private key and a user signature verification root public key for a plurality of user sides; a digital signature module which is used for recovering according to a plurality of signature private key fragments sent by a plurality of user sides to obtain a user signature root private key, and carrying out signature processing on the to-be-signed data by adopting the user signature root private key to obtain to-be-signed data; and a digital signature verification module which is used for recovering according to the plurality of signature verification public key fragments sent by the plurality of user sides to obtain a user signature verification root public key, carrying out signature verification processing on the data to be subjected to signature verification by adopting the user signature verification root public key, and determining whether the signature verification of the data to be subjected to signature verification is passed or not. According to the method and the device, the technical problems that the signature verification process of multiple signatures in a traditional digital signature system is low in efficiency and even causes a single-point fault that signature verification cannot be performed are solved.