Unlock instant, AI-driven research and patent intelligence for your innovation.

Short-distance multi-user covert communication method and system based on Wi-Fi network card

A covert communication, multi-user technology, applied in short-distance communication services, link quality-based transmission modification, transmission systems, etc., can solve the problem that RSSI signals are easily captured, the data transmission rate is limited by network card switches, and it is not conducive to data concealment. Transmission etc.

Active Publication Date: 2019-10-01
NORTHWEST UNIV
View PDF15 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (2) The RSSI signal is easy to be captured, and the RSSI information can be captured by any commercial network device in the space, which is not conducive to the concealed transmission of data;
[0006] (3) The data transmission rate is limited by the delay of the network card switch, only about 1bps

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Short-distance multi-user covert communication method and system based on Wi-Fi network card
  • Short-distance multi-user covert communication method and system based on Wi-Fi network card
  • Short-distance multi-user covert communication method and system based on Wi-Fi network card

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] In this embodiment, a method for concealed communication of short-distance multi-users based on a Wi-Fi network card is disclosed, including the following sub-steps:

[0078] Step 1: The Wi-Fi signal source sends out a radio frequency signal, and the receiving end receives the radio frequency signal and calculates the original CSI between the Wi-Fi signal source and the receiving end according to the radio frequency signal;

[0079] Step 2: The user end reflects the radio frequency signal sent by the Wi-Fi signal source. The user end includes multiple users. Each user uses a network card to simultaneously load their respective orthogonally encoded information sequences on the radio frequency signal, and obtain a comprehensive radio frequency signal through superposition. Signal;

[0080] Step 3: The receiving end receives the integrated RF signal and calculates the CSI between the Wi-Fi signal source and the receiving end based on the integrated RF signal, and establish...

Embodiment 2

[0145] A short-distance multi-user covert communication system based on a Wi-Fi network card, including a Wi-Fi signal source, a user terminal, and a receiving terminal;

[0146] The Wi-Fi signal source is used to send a radio frequency signal to the receiving end;

[0147] The user end includes K users, and each user uses a network card to simultaneously load their respective information sequences to the radio frequency signal, and each user uses a network card to simultaneously load their respective orthogonally coded information sequences to the radio frequency signal, and obtain a comprehensive radio frequency signal through superposition. The signal synthesis radio frequency signal is reflected to the receiving end;

[0148] The receiving end receives the radio frequency signal sent by the Wi-Fi signal source and the integrated radio frequency signal reflected by the user end, respectively calculates the CSI between the Wi-Fi signal source and the receiving end, and estab...

Embodiment 3

[0168] experiment procedure

[0169] First, a multi-user covert channel backscatter communication system is constructed in the 5GHz frequency band through commercial Wi-Fi equipment. Then, we collect data through the system to evaluate system performance. The experimental data collection is carried out in an ordinary laboratory, and there are multiple Wi-Fi access points (APs) working in the same frequency band in the surrounding rooms or corridors, which always cause interference to the system.

[0170] Evaluation and configuration

[0171] The experimental evaluation is based on Figure 6 Designed for the user scenarios shown in . Specifically, we used a commercial miniature desktop computer equipped with an Intel 5300 Wi-Fi network card and a 5dBi omnidirectional antenna as a signal assistant and a receiver, respectively. And a commercial miniature desktop computer equipped with Atheros AR9580Wi-Fi network card and 5dBi omnidirectional antenna for users. The experiment...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a short-distance multi-user covert communication method and system based on a Wi-Fi network card. The method comprises the following sub-steps: step 1, a Wi-Fi signal source sends out a radio frequency signal, and a receiving end receives the radio frequency signal and calculates CSI between the Wi-Fi signal source and the receiving end; step 2, the user side reflects the radio frequency signal sent by the Wi-Fi signal source; each user simultaneously loads an information sequence which is subjected to orthogonal coding to the radio frequency signal by using a network card, and a comprehensive radio frequency signal is obtained through superposition; step 3, the receiving end receives the integrated radio frequency signal and calculates CSI between the Wi-Fi signalsource and the receiving end according to the integrated radio frequency signal, establishes mapping from the CSI amplitude to the signal level to obtain a comprehensive signal level, and decodes thecomprehensive signal level to obtain an information sequence of a user. According to the invention, data of a plurality of users can be transmitted, a receiver at a receiving end is helped to separateimportant information of the plurality of users, and the safety of transmitting the important information by the users through public network connection is ensured.

Description

technical field [0001] The invention belongs to the technical field of covert communication, and in particular relates to a method and system for short-distance multi-user covert communication based on a Wi-Fi network card. Background technique [0002] In recent years, with the increasing popularity of wireless networks and mobile smart terminals, short-range wireless data transmission has become an indispensable part of people's daily life. In the short-distance situation, a large amount of user privacy information is transmitted between user devices through Wi-Fi, Bluetooth, NFC and other methods, and there are huge security problems. According to the "Security Report for the First Quarter of 2019" released by Tencent Mobile Security Lab, as of March, the number of public Wi-Fi has reached 984 million, covering public places such as airports, hotels, and large shopping malls, and no risky Wi-Fi has been found. Fi accounts for 58.18%, while risky Wi-Fi accounts for 41.82%...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/80H04L1/00H04B17/309
CPCH04B17/309H04L1/0009H04L1/0026H04W4/80
Inventor 牛进平马跃郭艺张李鱼跃华陈峰尹晓燕陈晓江房鼎益汤战勇
Owner NORTHWEST UNIV