181results about How to "Guaranteed to be tamper-proof" patented technology

The invention discloses a data processing system based on a block chain. The system comprises: an infrastructure layer consisting of a portal, a client and N servers based on peer-to-peer network communication. Each server establishes an initial block of a block chain and maintains a block chain. A processing layer is used for realizing the data interaction and processing between the system application layer and the infrastructure layer. The layer comprises a data uploading module, a single block verification module, a data query module, and each server of the infrastructure layer in the periodic block chain verification module periodically verifies the correctness of the self-maintained block chain. The application layer is used for calling the module of the processing layer according tothe request of the user, and realizing the access control in this layer. By utilizing the embodiment of the invention, the system query data efficiency and the resource utilization ratio are higher than those of other block chain processing systems.

The invention discloses an electronic invoice generation method based on digital signatures. The method includes the steps that according to a request of an enterprise, a tax bureau end generates an empty electronic invoice file with the tax bureau digital signature according to content, serving as original text data, of the empty electronic invoice file and sends the empty electronic invoice file to the corresponding enterprise end; when filling in and issuing an electronic invoice, the enterprise end obtains the empty electronic invoice file with the tax bureau digital signature and conducts signature verification on the tax bureau digital signature, and if the signature passes verification, the electronic invoice is issued on the empty electronic invoice file according to order information and the enterprise digital signature is generated according to the content, serving as original text data, of the issued electronic invoice and is stamped on the electronic invoice; the enterprise end transmits the issued electronic invoice file and additional data of the electronic invoice to the tax bureau end in the form of file streams after the issued electronic invoice file and the additional data are encrypted; the tax bureau end decrypts received file stream data and verifies the obtained enterprise digital signature, and centralized storage of the electronic invoice is conducted in a tax bureau if the enterprise digital signature passes verification.

The invention relates to a system configuration tool and model cloud system bidirectional checking interaction method. The method comprises the steps that an intelligent substation system configuration tool requests to download an ICD model file from a model cloud system; the intelligent substation system configuration tool conducts signature verification on function information of the ICD model file; the intelligent substation system configuration tool conducts consistency verification on the ICD model file obtained after signature verification and an SCD model file stored in the intelligent substation system configuration tool; and the intelligent substation system configuration tool uploads the SCD model file passing consistency verification to the model cloud system. By adopting the method of achieving system configuration tool and model cloud system bidirectional interaction and conducting on-site configuration model checking, system configuration tool and model cloud system bidirectional interaction can be guaranteed, the problem that an on-site configuration model is inconsistent with the model cloud system is avoided, and meanwhile the model authenticity, the unavailable tampering property and the off-line model and on-line model consistency of on-site configuration are guaranteed by conducting digital signature verification and on-line dynamic model checking.