KR19980030040A - Chaos sparking device and method - Google Patents

Abstract

Chaos sparking device is configured to protect personal information from invasion of privacy and to prevent the leakage of personal information in the rapid change to the information society by sparking one-dimensional signal or voice signal. Existing methods for secreting one-dimensional and voice signals in a communication network have a problem of high complexity and cost of the device. Chaos phenomenon is very unpredictable due to the complicated and irregular movement. Chaos sparking device using this phenomenon can completely prevent eavesdropping from eavesdropping, and the simplicity and economic advantages of the device. The chaos scrambler is a sampled input one-dimensional or audio signal (or gain: 0 to 4 or 1+). 4) can be reproduced by the chaos signal generator and transmitted, and can be reproduced as the original signal by the reverse process of the chaos secretion process in the chaotic decoder to reproduce the secreted signal.

Description

Chaos sparking device and method

1 is a block diagram of a one-dimensional signal and speech signal sparking device embodying the present invention.

2 is a block diagram of a second type of one-dimensional signal and speech signal sparking device embodying the present invention.

3 is a block diagram of the chaos generator

4 is a block diagram of a signal reproducing apparatus embodying this invention.

Technical Field

The present invention relates to an apparatus for encrypting a one-dimensional signal or a voice signal using a chaos principle, and to an apparatus and method for decrypting an input signal. A chaos decoding device and method for reproducing a signal as an original signal.

Background

With the rapid development of the information society, interests in personal information management are increasing day by day, and researches are being actively conducted on the transmission signal for security purposes in communication devices and computer communication devices. Recently, widespread spectrum, CDMA, frequency hopping, and the like, which are widely used as wireless communication secretion schemes, are widely known. Communication devices using this communication method are excellent in non-combustible and reproducible performance, but have complicated characteristics and high price. Therefore, there is a demand for a sparking device having a high signal flammability and a reproducible performance and having a simple device configuration and economical efficiency.

Chaos theory in the field of pure scholarship is now widely applied in many fields. This research can be said to be in the process of developing into a field of application from the accumulation of basic theory. In other words, attempts are being made to integrate artificial intelligence and neural networks beyond the fields of physics and biology, and research is being actively conducted in fields such as encryption, data compression, and automatic control. At present, there are products that apply chaos theory in the domestic market, and the future of the application field cannot be predicted.

Chaos is an unpredictable state due to very complex and irregular movements. Chaos theory is to interpret and uncover certain rules or laws inherent in irregular phenomena that seem to move and behave like this. This chaotic phenomenon refers to a complex and noise-like phenomenon generated from a non-linear dynamical system and can generate a chaotic signal from a nonlinear dynamical system such as Equation (1).

X _{n + 1} = μf ^(s) (Xn), (μ: integer, s = 1, 2,… N) (1)

Where s = 1

f ^(s) (X _n ) = X _n (1-X _n ) or

f ^(s) (X _n ) = (1/4) sin (πX _n )

Equation (1) is a state equation of a discrete-time dynamical system in which the current state (X _n ) is mapped to the next state (X _{n + 1} ) by the function f ^(s) (·). to be. The signal generated by this equation is affected by the gain (μ) and the initial value (X ₀ ), so given the gain and the initial value, there are a myriad of signals, X _n (n = 0, 1, 2,…). It can have advantages that can be generated. In addition, due to the sensitivity sensitive to the initial value, the generated signals have random characteristics and are not correlated with each other and have deterministic characteristics.

The chaos generator constructed using Equation (1) is shown in FIG. Figure 3 shows the relationship between states X _n and X _{n + 1} , where numerous points are generated in succession by the given gain and initial value. This signal X _n is called an orbit of the discontinuous system, and the range of gain and generated signal X _n can be as follows.

(2)

In addition, the signal generated by Equation (1) varies in signal characteristics depending on the initial value and the gain. That is, even if the same initial value is given, the signals generated according to the given gains have different characteristics. The characteristics of the chaotic signal having such many properties are listed as follows.

① It is easy to occur.

② Can generate a myriad of signals depending on the initial value and gain.

③ By sensitive dependence of initial value, it can generate uncorrelated but decisive signal like noise.

4. If the initial value and the gain are not specified, the rate of transmission increases because it is unpredictable.

Disclosure of the Invention

According to this invention, the same chaotic signal cannot be generated unless the initial value and the gain are specified. If there is a chaos signal generated by Equation (1), and you want to generate the same chaos signal, you need to know the initial value and the gain. If the initial values are the same, the gain value can be obtained by the following equation (3), and the same chaotic signal is generated by substituting the given initial value and the gain value obtained by the equation (3) into equation (1). Can be.

By using Equation (1), the following gain value can be obtained.

X _n-1 , X _n , and X _{n + 1} each represent adjacent sample values.

Therefore, the present invention enables the use of chaos theory for the one-dimensional signal and the reconstruction and reproduction of the non-enhanced signal.

1 is a block diagram of a signal sparking device to obtain a signal obtained by applying a chaos theory to a one-dimensional signal or a voice signal as follows. In FIG. 1, the signal input unit E ₁₁ is an input unit of a one-dimensional signal or an audio signal, and the signal is limited to the range of the value (or gain) of the equation (2) in the A / D converter E ₁₂ . After sampling, a value converted into an analog signal (E ₁₃ ) is sent to the input by the chaotic transform unit (E ₁₄ ) to generate a secreted signal and input to the signal conversion unit (E ₁₅ ). The block diagram of the chaos generating unit is shown in FIG.

2 is a block diagram of the second type of signal secreting apparatus, and the signal input unit E ₂₁ is a one-dimensional signal or an audio signal input unit, and the signal is input to the A / D converter E ₂₂ to undergo a sampling process. After converting into digital signal, mapping unit (E ₂₃ ) that can be implemented by CPU, memory or ASIC generates a value (or gain) and identification number (ID No, or Acknowledge signal) for generating chaos and converts it into analog signal. (E ₂₄ ), this value (or gain) is sent to the input of the chaotic transform section E ₂₅ to generate a secreted signal and input to the signal transform section E ₂₆ .

The block diagram of the chaos generating unit is shown in FIG. 3, and the value (or gain) input to the chaos generating unit (E _{14 in} FIG. 1 and E _{25 in} FIG. 2) is represented by the formula (2) or 1+. Has a value (or gain) from to 4. The chaos generator of E _{14 in} FIG. 1 and E ₂₅ in FIG. 2 generates a myriad of signals according to the one (or gain) made above. However, the actual signal used uses at least two values of the chaotic signal generated by one gain value or more.

4 is a block diagram of a signal reproducing apparatus, and a signal reproducing apparatus (FIG. 4) shows an original one-dimensional signal using chaos principle from a signal transmitted by a signal sparking apparatus (FIGS. 1 and 2). An apparatus and method for reproducing audio signals.

After sampling the signal input to the signal reproducing apparatus (figure 4) by the A / D converter D ₃₁ and extracting the value (or gain) by the equation (3) from the chaos decoder D ₃₂ , the original signal Conversion output (D ₃₃ ). Here, the chaotic decoder D ₃₂ includes a buffer. In the chaotic decoding unit D ₃₂ , a value (or gain) is generated according to equation (3) by two or more chaos signals generated by the chaotic generating unit (E _{14 in} FIG. 1 and E _{25 in} FIG. 2). Therefore, the chaotic decoder performs one or more steps of Equation (4) to extract the value (or gain) to reproduce the original signal.

Claims (4)

An apparatus for decrypting the input signal and a method for reproducing the signal after the inputted one-dimensional signal or an audio signal are output as an irregular signal using a chaotic theory, and the method for sampling the input signal. Before and after the sampled signal is sampled and then limited to a range of values (or gains) as in Eq. (2), the signal is sparked by the chaotic signal generator (FIG. 3). In order to recover the signal from the secreted signal, a value (or gain) is extracted in the same manner as in Equation (3), and the signal is reproduced using the extracted value. The method of claim 1, wherein the method of limiting the one-dimensional signal or the audio signal to the range of the value (or gain) of Equation (2) comprises: the range of the value (or gain) of Equation (2) before sampling the input signal. And sampling (in FIG. 2) the sampling of the sampled input signal to the range of the value (or gain) of Equation (2). Gain) is 1 + Values from to 4 are also possible. 3. The obtained value (or gain) is input to a chaos generator (figure 3) to generate a myriad of chaotic signals that appear irregular and to secrete using two or more of the generated chaotic signals. The value (or gain) is restored by performing one or more of the processes of Equation (3). The obtained value (or gain) is restored and reproduced by the one-dimensional signal or the audio signal secreted by the inverse process of claim 2. In this case, it is assumed that the initial value of the chaos signal generator (E _{14 in} FIG. 1 and E _{25 in} FIG. 2) and the chaotic decoder (D ₃₂ in FIG. 4) use the same value. For 1-D signals or audio signals, conversion and reconstruction and reproduction of the signals using chaotic theory or PCM, DPCM, ADPCM, DM, ADM, AM, FM, binary (quad and octal) ASK, binary ( (Binary, octal) FSK, binary (quad, octal, hexadecimal) PSK, binary (quad) DPSK, OQPSK, π / 4 QPSK, MSK, GSM, hexadecimal (hexadecimal, 32 binary, 64 binary) Pre- and post-processor of wired / wireless communication method using modulation method such as QAM, TFM, Spread-Spectrum method, etc. .