10 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.

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 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 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 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.