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A Covert Communication Method Based on Video Decoding Electromagnetic Leakage

A technology of covert communication and video decoding, applied in the field of communication, can solve the problem that the video cannot be read

Active Publication Date: 2020-03-24
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, if the video file is not obtained, the steganographic content in the video cannot be read using the existing video steganography technology

Method used

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  • A Covert Communication Method Based on Video Decoding Electromagnetic Leakage

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Embodiment Construction

[0024] The method of the present invention will be further described below in conjunction with the drawings.

[0025] The present invention provides a covert communication method based on electromagnetic leakage of video decoding, especially video steganography and reading methods, which are different from traditional video steganography methods. The method uses the change of the magnetic field near the CPU during video decoding. Other devices with magnetometers can read the video steganographic content, so that the physical isolation of the network can be broken when the steganographic content is read. The flowchart of video steganography and reading is as follows figure 1 As shown, it mainly includes adding error correction code, adding synchronization sequence, 2ASK (binary amplitude shift keying) modulation to generate video coding information sequence, video coding, video playback and magnetic signal acquisition, magnetic signal synchronization, filtering, 2ASK demodulation...

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Abstract

The invention discloses a covert communication method based on video decoding electromagnetic leakage. A magnetic field leaked when a CPU works is used and the frame type and quantization parameter ofcertain frames of a video are changed, thereby changing the CPU occupancy rate when the video plays the corresponding frame, and steganographic information is leaked out through the magnetic field ofthe CPU. By adoption of the method in the invention, the video steganographic information is read without obtaining a video file, and only needing to collect a magnetic signal of the CPU with a smartphone or a magnetic sensor and recover the content of the video steganographic information from the signal when the video is played.

Description

Technical field [0001] The invention belongs to the field of communication technology, and relates to video steganography and magnetic field communication technology, in particular to a covert communication method based on electromagnetic leakage of video decoding. Background technique [0002] The current video steganography technology requires video files to be read. In some important places, physical isolation is usually used to ensure network security to prevent the leakage of sensitive information. For example, the device is prohibited from connecting to the wireless network, the internal private network is physically separated from the Internet of Things, and visitors are prohibited from taking photos, recording, and video recording, and operating sensitive devices. In this case, without obtaining the video file, the steganographic content in the video using the existing video steganography technology cannot be read. For situations where video files cannot be obtained, how...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/467H04N21/835H04N21/234H04N21/44
CPCH04N19/467H04N21/234H04N21/44H04N21/835
Inventor 徐文渊冀晓宇张聚川
Owner ZHEJIANG UNIV
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