16 results about "Broadcast encryption" patented technology

A computer-implemented method of enabling users to access broadcasted messages using blockchain transactions comprising: determining a set of users eligible to access a message; maintaining a key graph comprising a plurality of nodes representing keys, generating an encrypted message; determining a set of encrypted data items; obtaining a message transaction comprising: a respective input associated and signed by each respective user, a respective input associated with and signed by the broadcasting party, a respective output associated with and locked to a respective public key of the respective user and / or a public key of the broadcasting party, and a respective output comprising the set of encrypted data items; causing the message transaction to be submitted to a blockchain network; and broadcasting the encrypted message to at least the set of users.

A candidate broadcast encryption scheme for N users with parameter size poly(log N) is disclosed. Security of the scheme can be proved under a non-standard variant of the learning with errors (LWE) assumption, yielding a broadcast encryption scheme that is post-quantum secure with a security reduction to a simple assumption. Also disclosed is a ciphertext policy attribute-based encryption (CP-ABE) scheme for circuits of a-priori bounded polynomial depth where the parameter size is independent of the circuit size, where security can be proved under an additional non-standard assumption.

The application discloses a reverse firewall method suitable for broadcast encryption and belongs to the technical field of information security. The method deploys a reverse firewall at a key generation center KGC and an encryptor in a broadcast encryption protocol to resist backdoor attacks. The specific steps include the following: firstly, the KGC initializes system public parameters and broadcasts the re-randomized public parameters to all participants, including the encryptor and the decryptor; secondly, the KGC generates a key pair of the encryptor and the decryptor; then, the encryptor generates ciphertext by running an encryption algorithm by using the re-randomized public parameters and the decryptor set, and sends the ciphertext header to the decryptor after re-randomization; finally, if the decryptor is in the selected set, the decryptor calculates a session key by using the public parameters, the ciphertext header and the private key to perform decryption, so that the privacy information of the participants cannot be leaked to an attacker, and thus the privacy leakage prevention of the overall broadcast encryption method is realized.

The invention relates to the technical field of block chains and cryptography, in particular to a decentralized group communication authentication broadcast encryption method based on a block chain. Through six core steps of system initialization, user initialization, CRS generation, network joining, signature / encryption and verification / decryption, public parameters and a global CRS vector are generated through an intelligent contract, a user can complete key negotiation and identity verification without multiple rounds of interaction, and the communication process is concise and efficient; the sender generates a ciphertext with a fixed size and broadcasts the ciphertext to the block chain, and the receiver independently completes key reconstruction and decryption by virtue of a private key of the receiver, so as to eliminate dependence on a central mechanism and a single-point fault risk; on the basis of a bilinear group cryptography hypothesis, under a random oracle model, the random oracle model has selected ciphertext attack security and strong unforgeability under selected message attack; key negotiation and broadcast encryption can be completed by one round of communication without a central mechanism, and security, high efficiency and expansibility are considered.

This application discloses a data transmission method, apparatus, computer device, and storage medium. The method includes: negotiating a key between a first device and each second device based on preset configuration parameters to generate a broadcast key and a content key between the first device and each second device; encrypting broadcast data using the broadcast key to generate encrypted broadcast data, and broadcasting the encrypted broadcast data; when connecting to a target second device that communicates with the first device based on the encrypted broadcast data, encrypting the content data using the content key to generate encrypted content data; sending the encrypted content data to the target second device and receiving the encrypted data processing result returned by the target second device based on the encrypted content data; and decrypting the encrypted data processing result using the content key to obtain the data processing result. By using the content key and broadcast key negotiated between the devices for encrypted data transmission, data security is ensured.

The invention discloses an anonymous broadcast encryption and multi-party authentication transmission method based on extended chaotic mapping, and belongs to the technical field of information security. The method comprises the following steps of: 1, initializing a system: generating a master key and a corresponding public key; step 2, key generation: the node calculates a private key by using an extended Chebyshev polynomial in combination with the master key and the identity information of the node; step 3, signcryption: broadcast information is constructed by using extended chaotic mapping in combination with a Lagrange interpolation polynomial, and a signature is generated; step 4, de-signcryption: the receiver calculates related parameters and verifies the signature, recovers the plaintext by using the own key after the verification is passed, and terminates decryption if the verification is not passed; and step 5, constructing a relay transmission network: ensuring anonymity and untraceability of a sender and a receiver. According to the method, high calculation efficiency and low communication overhead are realized, anonymity, public verifiability, confidentiality and unforgeability are met, ciphertext disturbance can be effectively resisted, and security guarantee is provided for sensitive information transmission.

The application discloses an anonymous broadcast encryption and multi-party authentication transmission method based on an extended chaotic mapping and belongs to the technical field of information security. The method comprises the following steps: 1, system initialization: generating a master key and a corresponding public key; 2, key generation: a node calculates a private key by using an extended Chebyshev polynomial in combination with the master key and identity information of the node; 3, signing and encrypting: constructing broadcast information by using an extended chaotic mapping in combination with a Lagrange interpolation polynomial to generate a signature; 4, decrypting the signature: a receiver calculates relevant parameters and verifies the signature, recovers plaintext by using a self key after verification, and terminates decryption if the verification fails; and 5, building a relay transmission network: guaranteeing the anonymity and untraceability of a sender and a receiver. The method has high calculation efficiency and low communication overhead, meets the anonymity, open verifiability, confidentiality and unforgeability, can effectively resist ciphertext disturbance and provides security guarantee for sensitive information transmission.

The invention discloses a security isolation and information exchange method based on an encryption algorithm, and the method comprises the following steps: 1, dividing a source security domain and a target security domain, and setting a controlled communication channel; 2, generating a public key parameter and a secret key parameter based on a certificateless public key cryptosystem; 3, determining an encryption control condition, an encryption path and a broadcast encryption parameter, and generating a target side context binding identifier; step 4, generating a controlled ciphertext in the source security domain; step 5, executing proxy re-encryption processing in a cross-security domain; 6, transmitting the controlled ciphertext to the target security domain in a one-way manner through the controlled communication channel; step 7, completing context consistency verification; and 8, recording audit information. According to the method, a certificateless public key cryptosystem, a symmetric encryption algorithm, a broadcast encryption technology and a proxy re-encryption mechanism are combined, so that the security, compliance and auditing performance of an information exchange process among environments with different security levels are remarkably improved.

The invention provides an encryption method and system of a trusted chip and a storage medium, relates to the field of industrial internet security, and solves the technical problem that an existing encryption method is insufficient in adaptability when the network scale changes. The method comprises the following steps: broadcasting an encrypted beacon frame to adjacent equipment through a built-in dual-mode radio frequency device, and receiving a response beacon frame of the adjacent equipment; constructing a trust topological graph based on the response beacon frames; and identifying cluster head equipment and member equipment of the trust topological graph, and activating a corresponding encryption layer according to the cluster head equipment and the member equipment. The method and the device are used for realizing the equipment encryption process of the trusted chip in the industrial network.

The application discloses a privacy protection system based on federated learning and relates to the technical field of privacy protection.The system comprises a distributed participating node cluster, each participating node is configured with a local model training unit and a privacy protection module, a coordination server connected with each participating node through a secure communication layer, containing a model aggregation module and a dynamic trust evaluation module, a global model distribution channel for broadcasting encrypted global model parameters to participating nodes, and a privacy protection module integrated in the local participating node, containing a homomorphic encryption engine and a local differential privacy injector.The application synchronously achieves the improvement of privacy protection strength, the optimization of model utility, the breakthrough of system efficiency and the expansion of security boundary under the federated learning framework, and provides an industrial-level solution for cross-domain data collaborative learning.

A computer implementation method that enables users to access a broadcasted message using blockchain transactions, comprising: determining a set of users eligible to access the message; maintaining a key graph having multiple nodes representing keys; generating an encrypted message; determining a set of encrypted data items; obtaining a message transaction having respective inputs associated with and signed by each user, respective inputs associated with and signed by broadcasting parties, respective outputs associated with and locked to each user's and / or broadcasting party's public keys, and respective outputs having a set of encrypted data items; submitting the message transaction to a blockchain network; and broadcasting the encrypted message to at least a set of users.

The application discloses a kind of unmanned plane authentication methods based on broadcast encryption information, it is related to unmanned plane communication technical field, specifically discloses, constructs several that encryption decryption rules, and based on association change rule, determine the encryption decryption rule applied in different time section, based on encryption decryption rule, interactive information is encrypted and decrypted, based on the location and flight length of unmanned plane at present, determine the first security risk factor of unmanned plane, based on the number of times of unknown information received by unmanned plane or control center, determine the second security risk factor of unmanned plane, the timeliness requirement of interactive information is comprehensively analyzed, first security risk factor and second security risk factor, determine the length of specific key and the change frequency of association change rule, while guarantee the timeliness of the security of interactive information between unmanned plane and control center.

The invention discloses a smart contract signing method and device based on edge computing and a medium. The method is applied to privacy computing and a block chain, and comprises the following steps: acquiring a signing request of a target user, extracting signing information of the target user based on the signing request, and transmitting the signing information to an edge computing environment; in the edge computing environment, calling target user protocol data of the block chain based on the subscription information, and performing intelligent contract signing according to the target user protocol data to generate a contract signing result; and determining a permission user set corresponding to the contract signing result, and encrypting the contract signing result by using a broadcast encryption algorithm based on the permission user set to generate an encrypted contract signing result. Through processing in the edge computing environment, the data transmission distance can be shortened, the delay is reduced, and the processing efficiency is improved. Manual intervention is not needed, and a self-service signing process is realized. And the authority of the signing result is bound with the user set through a broadcast encryption algorithm, and only the authorized user can decrypt the result, so that the privacy of the user is ensured.

The invention discloses an intelligent fusion terminal plug-and-play configuration method and system oriented to multi-modal equipment, which is used for accessing target equipment to an intelligent fusion terminal, and comprises the following steps: the target equipment broadcasts target characteristic data in a short range; the intelligent fusion terminal receives the target feature data in a short range and searches corresponding target equipment total information according to the target feature data; the intelligent fusion terminal confirms a target access port according to a target port opening rule, and encrypts the target access port into encrypted data according to a target port encryption protocol; the intelligent fusion terminal broadcasts the encrypted data in a short range and drives the intermediate unit to open a target access port; and the target equipment receives the encrypted data in a short range, analyzes the encrypted data into an ideal access port through a built-in target port decryption protocol, and then initiates connection to the intermediate unit according to the ideal access port. According to the configuration method and system, the convenience of accessing the target accessory equipment to the intelligent fusion terminal and the operation safety of the fusion terminal can be considered.

The invention relates to the technical field of broadcast encryption, and discloses a block chain fragmentation method based on broadcast encryption, which comprises the following steps: firstly, carrying out broadcast encryption, and establishing a broadcast encryption group according to broadcast encryption for each node to form a fragment; then public and private keys are generated, the public and private keys of each node are generated according to the characteristics of the broadcast encryption group, the public key is used for encryption, and any node in the broadcast encryption group can be decrypted by adopting the private key; after encryption, carrying out ciphertext transaction in the fragments, and in each fragment, sending all transactions and messages by adopting broadcast encryption; and after the transaction is decrypted, the ciphertext in the fragment is billed in each fragment, and only the node in the fragment can decrypt and identify the block or the transaction. The security problem is solved by introducing the broadcast encryption technology and encrypting the data on the chain, the data encrypted by the broadcast encryption technology is stored in a ciphertext state on the chain, and non-relevant nodes or users cannot decrypt the ciphertext, so that the purpose of privacy protection is achieved.