3results about How to "Achieve defense" patented technology

This invention provides a privacy-preserving method, system, and device for perturbation-based graph federation learning. Specifically, it includes the following steps: S0, acquiring original local graph data in the local environment of each federation participant, the original local graph data including graph node feature vectors and a first adjacency matrix; S1, calculating graph node embedding representation vectors based on the graph node feature vectors and the first adjacency matrix, simultaneously calculating the average degree of nodes, and then constructing a node similarity matrix; S2, selecting a potential edge for any node based on the node similarity matrix and average degree generated in S1, generating a potential edge set, and constructing a second adjacency matrix; S3, performing a secondary screening of the potential edges based on the potential edge set and the second adjacency matrix obtained in step S2, constructing a final adjacency matrix; S4, regenerating the graph node embedding representation vectors based on the final adjacency matrix obtained in S3, and uploading them to a central server.

The present application discloses a small celestial body offset efficiency evaluation method based on state transition tensor, and belongs to the field of spacecraft orbit mechanics. The method of the present application is as follows: a multi-body system dynamics model is established, the impact geometry of the small celestial body relative to the earth is calculated, and the state transition tensor of the small celestial body orbit is derived, so as to quickly calculate the influence of the initial state change of the small celestial body on the impact geometry, and obtain the orbit offset caused by the impact of the impactor when the earth's gravity is dominant after the small celestial body approaches the earth; the second-order state transition tensor is used to obtain the orbit offset of the small celestial body after a period of time, and the high-efficiency quantitative evaluation of the offset efficiency of the small celestial body after being impacted by the impactor is realized. By fixing the velocity deviation and changing the position and direction of the applied deviation, the optimal change direction corresponding to the optimal offset efficiency of the small celestial body orbit can be determined. The present application has the advantages of high evaluation accuracy and high efficiency, and is suitable for offset strategy selection and efficiency evaluation of small celestial body defense tasks.

The invention discloses a virus defense method, system and device and a computer readable storage medium, relates to the technical field of information security and storage protection, and is applied to defense software to detect whether a target host is attacked by a virus or not. In response to the fact that the target host is attacked by the virus, generating a hardware-level blocking signal; the hardware-level blocking signal is sent to a preset hardware device, so that the hardware device modifies firmware area parameters of the target host hard disk after responding to the hardware-level blocking signal, and then the target host hard disk refuses write-in operation on the physical level; wherein the communication link between the defense software and the hardware device is a link independent of the operating system of the target host, and the communication link between the hardware device and the hard disk of the target host is a link independent of the operating system of the target host. According to the method, independent defense which is not influenced by the authority of the operating system can be realized, the defense mechanism can still run normally even if the system is crashed or controlled, the defense capability of the hard disk to viruses is improved, and the security of the hard disk is ensured.