2results about How to "Control overhead" patented technology

The invention discloses an SM9-based verifiable fair broadcast proxy re-encryption method and a hardware architecture thereof, and relates to the technical field of information security. The re-encryption method comprises the following steps: encrypting an original message based on SM9 to generate an initial ciphertext, generating a re-encryption key based on a private key of a data owner and an authorized user identifier set, and sending the initial ciphertext and the re-encryption key to a proxy server; the proxy server performs re-encryption operation on the initial ciphertext based on the re-encryption key to generate a re-encrypted ciphertext, and broadcasts the re-encrypted ciphertext to all authorized users, and the authorized users perform decryption verification on the received re-encrypted ciphertext by using own private keys; and a public verifier can perform verification arbitration on the re-encrypted ciphertext based on a non-interactive zero-knowledge proof protocol. According to the re-encryption method provided by the invention, a multi-user application scene is expanded, direct verification of the re-encrypted ciphertext is realized, and a fair and neutral dispute judgment rule is established.

This application provides a field query method, apparatus, device, medium, and product, comprising: receiving a query request sent by a blockchain light node; parsing the query field from the query request; determining the field's popularity and whether it meets a preset index construction trigger condition; if so, parsing the query type from the query request and determining the target index structure from a preset set of index structure types; performing a query operation on the query request to obtain a query result; further generating verification information; compiling the verification information into a Boolean circuit; and generating a zero-knowledge proof based on the Boolean circuit; and sending the query result and the zero-knowledge proof to the light node. Thus, while improving query efficiency, it effectively controls verification and communication overhead and enhances the long-term stability of the blockchain system.