Abstract: Solutions for authenticating digital audio include: generating a first band-limited watermark using a first key, generating a second band-limited watermark using a second key, wherein the bandwidth of the second watermark does not overlap with the bandwidth of the first watermark; and embedding the first watermark and the second watermark into a segment of the digital audio file. Solutions also include determining a first watermark score of a segment of the digital audio file for the first watermark using the first key; determining a second watermark score of the segment of the digital audio file for the second watermark using the second key; based on at least the first watermark score and the second watermark score, determining a probability that the digital audio file is watermarked; and generating a report indicating whether the digital audio file is watermarked. In some examples, solutions may also embed and decode messages.

Abstract: This application provides exception detection methods and communication apparatuses. An example method includes: sending, to a first user plane network element, a request message for requesting to report a transmission status of first data of a terminal device; receiving the transmission status of the first data from the first user plane network element; when determining, based on an exception detection policy at a first level and the transmission status of the first data, that an exception at the first level exists in the terminal device, sending, to at least one user plane network element serving the terminal device, a request message for requesting to report a transmission status of second data of the terminal device; and determining, based on an exception detection policy at a second level and the transmission status of the second data, whether an exception at the second level exists in the first terminal device.

Abstract: Embodiments of this application provide a method for obtaining a security classification result for a location area. A security function network element receives an identifier of a target location area and determines to perform security analytics on the target location area based on the identifier of the target location area. The security function network element may determine a security classification result of the target location area based on first information, where the security classification result indicates a degree to which a potential attack exists in the target location area. The first information is related to behavior information of a terminal device in the target location area, where the behavior information includes traffic data and/or movement track information.

Abstract: This application provides a communication method, a communication device, a storage medium, and a program product, and may be applied to the field of 5th generation (5G) new radio (NR) technologies. When a communication apparatus meets an authentication trigger condition, authentication information is obtained from the communication apparatus by using an authentication request. The authentication information may be used to verify authenticity of first identification information of the communication apparatus, to implement security authentication on the communication apparatus. When a communication apparatus that passes the security authentication accesses a communication network, security of the communication network can be improved.

Abstract: The present application provides an automatic method for forecasting strong cold waves from horizontal-to-vertical trough transition using wave truncation, which includes: reading geopotential height data within a 500 hPa forecast key region in forecasting operations, and converting a screen coordinate system into a Cartesian coordinate system; analyzing contour lines of the geopotential height field; repeatedly truncating and splitting waves to extract truncation points; selecting trough candidate nodes from a set of truncation points; screening trough candidate nodes and organizing and constructing a trough line; detecting a slope of the trough fitting line to find a horizontal trough; calculating a north-south extension distance of the found horizontal trough; comparing this north-south extension distance with a north-south extension distance at a next time; and in a case where an increase amount exceeds a preset threshold, determining the start of a horizontal-to-vertical trough transition, thereby foreca