Covert communication method based on video frame offset coding

Abstract

The invention discloses a covert communication method based on video frame offset coding. Data are transmitted by using a magnetic field leaked when a CPU decodes a video. By changing timestamp information of some frames in the video, the decoding time of the corresponding frames when the video is played is changed, and then the occurrence time of the peak of the leakage magnetic field when the CPU works is changed, namely, the energy distribution of the magnetic field is changed. A normal magnetic field signal segment generated by the non-offset frame is coded as 1, an abnormal magnetic field signal segment generated by the offset frame is coded as 0, and steganography information is leaked by analyzing energy distribution of the magnetic field. By adopting the method provided by the invention, the reading of the video steganography information does not need to obtain a video file, and only needs to use the magnetic sensor with high sampling rate to collect the magnetic signal released when the CPU decodes the video when the video is played, analyze the energy distribution characteristics of the magnetic field and recover the content of the video steganography information from the magnetic field signal, so that the video steganography information can be read. And meanwhile, a relatively high data transmission rate can be realized, and the video size and quality are hardly influenced, so that the transmission concealment is ensured.

Description

technical field [0001] The invention belongs to the field of communication technology, relates to video steganography and magnetic field communication technology, and in particular relates to a covert communication method based on video frame offset coding. Background technique [0002] The reading of the current video steganography technology generally needs to directly obtain the video file, and analyze the video file to obtain the steganographic information. However, in some important places, physical isolation is usually used to ensure internal network security to prevent the leakage of sensitive information. For example, devices are prohibited from connecting to the wireless network, the internal private network is physically isolated from the Internet of Things, and visitors are prohibited from taking photos, recordings, videos, and operating sensitive equipment. In this case, the video file cannot be obtained, so reading the content encoded in the video through elect...

AI Technical Summary

Problems solved by technology

There have been related technologies to infer video encoding content through the magnetic field signal leaked by the CPU before, but it is only applicable to occasions where the transmission rate is not high and the video size and quality are not sensitive. How to design a new video steganography method to meet the high transmission rate , and has no obvious impact on video size and quality to meet the needs of covert transmission, it is an urgent problem to be solved

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