CN110943788B - Hidden information transmission method and system based on ship radiation noise - Google Patents

Hidden information transmission method and system based on ship radiation noise Download PDF

Info

Publication number
CN110943788B
CN110943788B CN201911234113.7A CN201911234113A CN110943788B CN 110943788 B CN110943788 B CN 110943788B CN 201911234113 A CN201911234113 A CN 201911234113A CN 110943788 B CN110943788 B CN 110943788B
Authority
CN
China
Prior art keywords
signal
result
binary code
module
hidden information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201911234113.7A
Other languages
Chinese (zh)
Other versions
CN110943788A (en
Inventor
何呈
芮超群
朱柏宇
戴跃伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu University of Science and Technology
Original Assignee
Jiangsu University of Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu University of Science and Technology filed Critical Jiangsu University of Science and Technology
Priority to CN201911234113.7A priority Critical patent/CN110943788B/en
Publication of CN110943788A publication Critical patent/CN110943788A/en
Application granted granted Critical
Publication of CN110943788B publication Critical patent/CN110943788B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
    • H04B13/02—Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
    • H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload

Abstract

The invention discloses a method and a system for transmitting hidden information based on ship radiation noise, wherein the method for transmitting the hidden information comprises the following steps: 1. a hidden information sending end intercepts a ship radiation signal x (t) with the time length of tau in real time; 2. when the transmitted binary code is 'B1', time reversal is carried out on x (T) and T is delayed, and a transmission signal x is obtaineds(T) ═ x (T-T); when the transmitted binary code is "B2", no signal is sent; the transducer sends out a sending signal; 3. the hidden information receiving end intercepts two sections of signals z (T) and r (T) with the interval of T from the received signals y (T); convolving z (t) and r (t), and normalizing the convolution result to obtain:
Figure DDA0002304413730000011
4. when max (result) is less than or equal to 0.5, the transmitted binary code is judged to be B2; when max (result)>At 0.5, the transmitted binary code is judged to be "B1". The transmission method is simple and efficient, radiation noise of the ship is used as a communication signal, the attention of an attacker is not easy to be attracted, and the concealment is better.

Description

Hidden information transmission method and system based on ship radiation noise
Technical Field
The invention belongs to the technical field of underwater acoustic communication, and particularly relates to a method and a system for transmitting hidden information by using radiated noise.
Background
With the rapid development of the information age, the traditional information security technology cannot effectively conceal information, and the encryption technology is more likely to attract the attention of attackers. Compared with the traditional encryption technology, the information hiding technology has the advantages that a layer of means for confusing attackers is added, and the safety is higher.
In a complex marine environment, the transmission of ship information is increasingly difficult, but during the running of a ship, ship radiation noise always exists. The ship radiation noise mainly comprises 3 parts of mechanical noise, propeller noise and hydrodynamic noise, the noise is used as a signal for masking transmission, so that the transmission and the hiding are convenient, and the difference of human ears on the ship radiation noise is not large, so that the information hiding technology using the ship radiation noise as a carrier deserves further intensive research.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a method and a system for effectively transmitting underwater hidden information.
The technical scheme is as follows: the invention discloses a hidden information transmission method based on ship radiation noise, which comprises the following steps:
(1) the method comprises the following steps that a hidden information sending end intercepts a ship radiation signal with the time length of tau in real time, and the ship radiation signal is marked as x (t), wherein t is more than 0 and less than tau;
(2) when the transmitted binary code is 'B1', time reversal is carried out on x (T) and T is delayed, and a transmission signal x is obtaineds(T), denoted x (T-T); when the transmitted binary code is "B2", no signal is sent; transmitting signal x from transducers(t) is:
Figure GDA0002981644660000011
wherein T is a preset time delay length; b1 and B2 are two basic symbols of the binary code;
(3) a signal received by a hidden information receiving end is y (T), and two sections of signals with the interval of T and the duration of tau are intercepted from the y (T) and are respectively marked as z (T) and r (T); convolving z (t) and r (t), and normalizing the convolution result to obtain:
Figure GDA0002981644660000021
denotes a convolution operation;
(4) calculating the maximum value max (result) of the normalized convolution result (result), and when max (result) is less than or equal to 0.5, judging that the transmitted binary code is 'B2'; when max (result) >0.5, the transmitted binary code is determined to be "B1".
On the other hand, the invention discloses a system for realizing the hidden information transmission method, which comprises a sending end and a receiving end, wherein the sending end comprises:
the radiation noise intercepting module is used for intercepting a ship radiation signal x (t) with the time length of tau in real time, wherein t is more than 0 and less than tau;
a transmission signal generation module for generating a transmission signal x emitted by the transducers(t)，xs(t) is:
Figure GDA0002981644660000022
wherein T is a preset time delay length; b1 and B2 are two basic symbols of the binary code; the input of the sending signal generating module is connected with the output of the radiation noise intercepting module;
transducer for transmitting a signal xs(t); the input of the sending signal generating module is connected with the output of the radiation noise intercepting module;
the receiving end includes:
a received signal intercepting module, which is used for intercepting two sections of signals z (T) and r (T) with the interval of T and the duration of tau from a received signal y (T);
a convolution module, configured to convolve z (t) and r (t), and normalize the convolution result to obtain:
Figure GDA0002981644660000023
the input of the convolution module is connected with the output of the received signal interception module;
a transmitted code element judging module, which is used for judging the transmitted binary code element according to the maximum value max (result) of result (t), and when max (result) is less than or equal to 0.5, judging the transmitted binary code to be 'B2'; when max (result) >0.5, the transmitted binary code is determined to be 'B1';
the input of the transmitted code element judging module is connected with the output of the convolution module.
Has the advantages that: the method for transmitting the hidden information utilizes the ship radiation noise to carry out hidden communication, compared with the prior art, the method for transmitting the hidden information is simple and efficient, the radiation noise of a ship is utilized as a communication signal, the attention of an attacker is not easy to be attracted, and the hiding performance is better; in the communication process, signals radiated by the ship are used as carriers, the realization cost is low, the energy of the signals emitted by the transducer is low, the communication mode is similar to MIMO (multiple input multiple output), the influence of the environment is small, and the anti-interference capability is strong.
Drawings
FIG. 1 is a flow chart of a method for hidden information transmission according to the present invention;
FIG. 2 is a waveform diagram of the ship radiation noise acquired by the hidden information transmitting terminal;
FIG. 3 is a graph of a ship radiation noise waveform with time length tau intercepted by a hidden information sending end;
FIG. 4 is a waveform diagram of a signal transmitted by a hidden information transmitting terminal;
FIG. 5 is a signal waveform diagram of a received signal convolved and normalized by a receiving end;
fig. 6 is a block diagram of the hidden information transmission system disclosed in the present invention.
Detailed Description
The invention is further elucidated with reference to the drawings and the detailed description.
In this embodiment, a binary code stream [ 101001 ] is sent as an example to explain the hidden information transmission method disclosed in the present invention, as shown in fig. 1, the flow is as follows:
step 1, a hidden information sending end intercepts a ship radiation signal with the time length of tau in real time, and records the ship radiation signal as x (t);
as shown in fig. 2, in a waveform diagram of a ship radiation signal intercepted by a sending end of hidden information, when the hidden information is to be sent, a signal x (t) with a length τ being 0.5s is intercepted in real time, and 0< t <0.5s, and the waveform thereof is shown in fig. 3.
Step 2, two basic symbols of the binary code are B1 and B2, in this embodiment, B1 is defined as 1, B2 is defined as 0, and when the transmitted binary code is "1", x (T) is time-reversed and delayed by T, so as to obtain a transmission signal xs(T), denoted x (T-T); when the transmitted binary code is '0', no signal is sent out; transmitting signal x from transducers(t) is:
Figure GDA0002981644660000031
wherein T is a preset time delay length;
the transmission signal is generated in turn from the binary code to be transmitted, and the waveform of the resulting transmission signal stream is shown in fig. 4, from which it can be seen that the information to be transmitted is well hidden in the ship radiation noise.
Step 3, the signal received by the hidden information receiving end is y (T), and two sections of signals with the interval of T and the duration of tau are intercepted from y (T) and are respectively marked as z (T) and r (T); convolving z (t) and r (t), and normalizing the convolution result to obtain:
Figure GDA0002981644660000041
fig. 5 shows a waveform of result (t).
And 4, according to the definition of convolution, the time length of a signal sent by one code element is 0.5s, the receiving end intercepts two signals with the time length of 0.5s, and the time length of the convolution signal after convolution operation is 1 s. Calculating the maximum value max (result) of the result (t) in each 1s, and obtaining the sent code element according to the result of max (result), wherein the judgment rule is as follows:
when max (result) is less than or equal to 0.5, the transmitted binary code is judged to be B2; when max (result) >0.5, the transmitted binary code is determined to be "B1".
The result (t) in fig. 5 is judged according to the threshold value 0.5, and the transmitted code stream is 101001, so that the transmitted hidden information is recovered.
Transmitting information sent by a transducer at a hidden information transmitting end to a receiving end, wherein in the transmission process, environmental noise exists, and the environmental noise when a signal z (t) is intercepted is recorded as n1(t) cutting the ambient noise at r (t) to n2(t)。
When the transmitted symbol is "0", the transmitting transducer does not transmit a signal,the receiving end receives only noise n (t), and the convolution is n1(t)*n2(t) due to n1(t) and n2(t) is weakly correlated, at which max (result) is less than 0.5.
When the transmitted code element is "1", the transducer at the transmitting end transmits a signal x (T-T), and the signal received by the receiving end includes the transmitted signal x (T-T) and the ship radiation signal x (T), which is:
y(t)＝x(T-t)+n1(t)+x(t)+n2(t)
two signals z (T) and r (T) of interval T and duration τ, taken from y (T), are:
Figure GDA0002981644660000042
at this point the convolution results
Figure GDA0002981644660000043
Since there is no correlation between noise and x (t), n1(t) and n2There is no correlation between (t), so z (t) r (t) x (-t) x (t), there is a correlation peak, max (result) is greater than 0.5, and the transmitted information code is 1.
The present embodiment further discloses a system for implementing the hidden information transmission method, which is shown in fig. 6 and includes a sending end and a receiving end, where the sending end includes:
the radiation noise intercepting module 1 is used for intercepting a ship radiation signal x (t) with the time length tau in real time;
a transmission signal generating module 2 for generating a transmission signal x emitted by the transducers(t)，xs(t) is:
Figure GDA0002981644660000051
wherein T is a preset time delay length; b1 and B2 are two basic symbols of the binary code; the input of the sending signal generating module is connected with the output of the radiation noise intercepting module;
transducer 3 for transmitting signal xs(t); the transducer is connected with the output of the sending signal generating module;
the receiving end includes:
a received signal intercepting module 4, configured to intercept two segments of signals z (T) and r (T) with an interval T from a received signal y (T);
a convolution module 5, configured to convolve z (t) and r (t), and normalize the convolution result to obtain:
Figure GDA0002981644660000052
the input of the convolution module is connected with the output of the received signal interception module;
a transmitted symbol decision module 6, configured to determine a transmitted binary symbol according to result, and when max (result) is less than or equal to 0.5, determine that the transmitted binary code is "B2"; when max (result) >0.5, the transmitted binary code is determined to be 'B1'; the input of the transmitted code element judging module is connected with the output of the convolution module.

Claims (6)

1. A hidden information transmission method based on ship radiation noise is characterized by comprising the following steps:
(1) the method comprises the following steps that a hidden information sending end intercepts a ship radiation signal with the time length of tau in real time, and the ship radiation signal is marked as x (t), wherein t is more than 0 and less than tau;
(2) when the transmitted binary code is 'B1', time reversal is carried out on x (T) and T is delayed, and a transmission signal x is obtaineds(T), denoted x (T-T); when the transmitted binary code is "B2", no signal is sent; transmitting signal x from transducers(t) is:
Figure FDA0002981644650000011
wherein T is a preset time delay length; b1 and B2 are two basic symbols of the binary code;
(3) the signal received by the hidden information receiving end is y (t), and the signal is intercepted from y (t)Two segments of signals with interval T and duration tau are respectively marked as z (T) and r (T); convolving z (t) and r (t), and normalizing the convolution result to obtain:
Figure FDA0002981644650000012
denotes a convolution operation;
(4) calculating the maximum value max (result) of the normalized convolution result (result), and when max (result) is less than or equal to 0.5, judging that the transmitted binary code is 'B2'; when max (result) >0.5, the transmitted binary code is determined to be "B1".
2. The hidden information transmission method of claim 1, wherein B1-1 and B2-0.
3. The hidden information transmission method of claim 1, wherein B1-0 and B2-1.
4. A kind of hidden information transmission system based on radiation noise, including sending end and receiving end, characterized by that, the said sending end includes:
the radiation noise intercepting module is used for intercepting a ship radiation signal x (t) with the time length of tau in real time, wherein t is more than 0 and less than tau;
a transmission signal generation module for generating a transmission signal x emitted by the transducers(t)，xs(t) is:
Figure FDA0002981644650000013
wherein T is a preset time delay length; b1 and B2 are two basic symbols of the binary code; the input of the sending signal generating module is connected with the output of the radiation noise intercepting module;
transducer for transmitting a signal xs(t); the transducer is connected with the output of the sending signal generating module;
the receiving end includes:
a received signal intercepting module, which is used for intercepting two sections of signals z (T) and r (T) with the interval of T and the duration of tau from a received signal y (T);
a convolution module, configured to convolve z (t) and r (t), and normalize the convolution result to obtain:
Figure FDA0002981644650000021
the input of the convolution module is connected with the output of the received signal interception module;
a transmitted code element judging module, which is used for judging the transmitted binary code element according to the maximum value max (result) of result (t), and when max (result) is less than or equal to 0.5, judging the transmitted binary code to be 'B2'; when max (result) >0.5, the transmitted binary code is determined to be 'B1';
the input of the transmitted code element judging module is connected with the output of the convolution module.
5. The covert information transmission system of claim 4, wherein B1 is 1 and B2 is 0.
6. The covert information transmission system of claim 4, wherein B1 is 0 and B2 is 1.
CN201911234113.7A 2019-12-05 2019-12-05 Hidden information transmission method and system based on ship radiation noise Active CN110943788B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911234113.7A CN110943788B (en) 2019-12-05 2019-12-05 Hidden information transmission method and system based on ship radiation noise

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911234113.7A CN110943788B (en) 2019-12-05 2019-12-05 Hidden information transmission method and system based on ship radiation noise

Publications (2)

Publication Number Publication Date
CN110943788A CN110943788A (en) 2020-03-31
CN110943788B true CN110943788B (en) 2021-05-11

Family

ID=69909207

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911234113.7A Active CN110943788B (en) 2019-12-05 2019-12-05 Hidden information transmission method and system based on ship radiation noise

Country Status (1)

Country Link
CN (1) CN110943788B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6859545B1 (en) * 2000-08-10 2005-02-22 Chung Shan Institute Of Science And Technology Information hiding method with reduced fuzziness
CN102916750A (en) * 2012-10-22 2013-02-06 江苏科技大学 Underwater sound covert communication method and system based on ship radiation noise
CN107612629A (en) * 2017-10-19 2018-01-19 厦门大学 A kind of hidden underwater acoustic communication method based on environment sensing
CN109040115A (en) * 2018-09-06 2018-12-18 中国科学院软件研究所 A kind of concealed communication method under block chain network environment

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3163012A1 (en) * 2015-10-30 2017-05-03 Siemens Aktiengesellschaft Subsea communication device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6859545B1 (en) * 2000-08-10 2005-02-22 Chung Shan Institute Of Science And Technology Information hiding method with reduced fuzziness
CN102916750A (en) * 2012-10-22 2013-02-06 江苏科技大学 Underwater sound covert communication method and system based on ship radiation noise
CN107612629A (en) * 2017-10-19 2018-01-19 厦门大学 A kind of hidden underwater acoustic communication method based on environment sensing
CN109040115A (en) * 2018-09-06 2018-12-18 中国科学院软件研究所 A kind of concealed communication method under block chain network environment

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
基于BitTorrent协议Have消息的信息隐藏方法;高斌等;《计算机应用》;20170110;第37卷(第1期);200-204 *

Also Published As

Publication number Publication date
CN110943788A (en) 2020-03-31

Similar Documents

Publication Publication Date Title
CN109412993B (en) Full-duplex cognitive underwater acoustic communication signal detection method capable of inhibiting self-interference based on deep learning
CN105227246A (en) A kind of underwater acoustic communication method utilizing segmentation LFM signal to imitate dolphin whistle signal
CN105515683B (en) Differential Chaos Shift Keying communication means based on hybrid system
Liu et al. Long-range double-differentially coded spread-spectrum acoustic communications with a towed array
Han et al. Experimental demonstration of underwater acoustic communication using bionic signals
Brady et al. Underwater acoustic communications
Qasem et al. Deep learning-based code indexed modulation for autonomous underwater vehicles systems
CN112953652B (en) Whale whistle-like communication method based on segmented time-frequency contour time delay modulation
CN103401619A (en) Underwater acoustic communication method based on virtual time reversal mirror M element bionic signal coding
CN107769862A (en) A kind of bionical low communication interception method
CN104486006A (en) Method and device for carrying out camouflaged covert underwater communication by utilizing whale sound
Jiang et al. A sonar-embedded disguised communication strategy by combining sonar waveforms and whale call pulses for underwater sensor platforms
CN204362059U (en) Utilize the hidden underwater communication device of the camouflage of whale sound
CN110943788B (en) Hidden information transmission method and system based on ship radiation noise
CN106910508B (en) Hidden underwater acoustic communication method for imitating marine pile driving sound source
Silva et al. Underwater acoustic communication using a time-reversal mirror approach
Tong et al. Channel equalization based on data reuse LMS algorithm for shallow water acoustic communication
CN107395292B (en) Information hiding technology communication method based on marine biological signal analysis
Yang et al. Double-differential coded M-ary direct sequence spread spectrum for mobile underwater acoustic communication system
Wu et al. The research on improved companding transformation for reducing PAPR in underwater acoustic OFDM communication system
CN108279418B (en) Combined detection and communication device and method using whale sound
Guimaraes et al. Snapping shrimp noise reduction using convex optimization for underwater acoustic communication in warm shallow water
US11223434B2 (en) Method for combating impulsive interference/noise in multicarrier underwater acoustic communications
Fedosov et al. Wireless data transmission in underwater hydroacoustic environment based on MIMO-OFDM system and application adaptive algorithm at the receiver side
KR20120139000A (en) Underwater acoustic communication technique with direct sequence spread spectrum

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant