JP3909173B2 - Noise signal generator and device using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a noise signal having a random frequency change by applying a predetermined reverse bias voltage to a Zener diode, that is, a noise signal generator for generating a white noise signal, and a device for using the same, for example, the above white Random data signal device that obtains a data signal representing a code or number having a random change based on a noise signal, and a secret communication device that performs communication using a secret signal whose communication content is changed by the data signal It is.
[0002]
[Prior art]
As this type of noise signal generator, the configuration of the noise signal generator 10 as shown in FIG. 6 (hereinafter referred to as “first prior art”) is disclosed in “Transistor Technology” magazine SPECIAL NO. 1 and the like. In the following drawings, parts denoted by the same reference numerals are parts having the same function.
[0003]
In FIG. 6, since a voltage exceeding the zener voltage Vz is applied to the zener diode 11 by applying a reverse bias voltage + Vb from the DC power supply via the protective resistor R1, a zener current flows, A white noise signal 11 a is generated between both ends of the Zener diode 11.
[0004]
Since the white noise signal 11a has a small voltage, the white noise signal 11a is amplified by a non-inverting operational amplifier circuit 12 having a negative feedback circuit composed of resistors R2 and R3 and a capacitor C1 to obtain a white noise signal 12a having a required voltage. Yes.
[0005]
Further, based on the white noise signal 12a, a number having a random change, that is, a random data signal, or a code data signal having a random change obtained by converting the random number into a code (hereinafter, referred to as a random data signal). A configuration of a random data signal device 20 as shown in FIG. 7 (hereinafter referred to as a second prior art) is well known as a random data signal device that obtains these data signals generically as a random data signal).
[0006]
In FIG. 7, a conversion circuit 21 is a circuit that converts a random frequency change in the white noise signal 12a from the noise signal generator 10 into a change in number or a change in code to obtain a random data signal 21a. For example, the white noise signal 12a is converted into a pulse signal by a limiter circuit or a differentiation circuit, and the number obtained by counting the number of occurrences per 1 μs within a very short predetermined time, for example, A random data signal with a random number obtained by converting the number obtained by counting with a clock pulse into a binary digital value, or this digital value is converted into a code such as a 50-character or alphabet character A random data signal 21a with a random code obtained by conversion is obtained.
[0007]
  In the case of the configuration for generating the random data signal 21a with the above-mentioned number, for example, a 5-digit binary number having randomness as shown in FIG. 8 is sequentially generated, and for example, the same binary number is generated. It is also well-known that randomness tests are conducted, for example, by investigating that there is an unequal interval between occurrences.sois there.
[0008]
Furthermore, as a secret communication device that performs communication using a secret signal that is encrypted by changing the communication contents using the random data signal 21a, the configuration of the secret communication device 100 as shown in FIG. Is disclosed in Japanese Patent Laid-Open No. 10-326365 based on the application of the present applicant.
[0009]
In FIG. 9, the secret communication device 100 includes, for example, a communication device 50 on the automobile 70 side and a communication device 60 on the toll gate 80 side. For example, an IC card processing device 71 provided in the automobile 70 and a fee The contents of the communication process with the fee collection processing device 81 provided at the station 80 are communicated with safety concealed to a third party.
[0010]
Each of the communication devices 50 and 60 performs a required control process by a control processing unit (hereinafter referred to as a CPU) 51 and 61 of each microcomputer, and transmission processing from the communication device 50 to the communication device 60 is performed. The information data 71a relating to the IC card (not shown) from the IC card processing device 71 is preliminarily agreed with the random data signal 21a (hereinafter referred to as 20a1) of the random data signal device 20 (hereinafter referred to as 20A). Based on the algorithm signal 54a from the key data signal 52a from the key storage circuit 52 storing the key data K exchanged and determined, and from the algorithm storage circuit 54 storing the algorithm for concealment processing determined in advance by exchanging promises. The encryption signal 51 a obtained by the encryption processing by the CPU 51 is transmitted wirelessly by the communication circuit 55. Amplification after conversion into the number of the modulation signal (hereinafter, referred to as modulation and amplification) a signal obtained by the transmission signal 55a, and transmits the transmission signal 55a from the antenna 56.
[0011]
In the reception processing in the communication device 60, the reception signal 66a obtained by receiving the transmission signal 55a with the antenna 66 is amplified by the communication circuit 65 and then detected as an encrypted signal 65a. Based on the key data signal 52a from the key storage circuit 62 similar to the storage circuit 52 and the algorithm signal 54a from the algorithm storage circuit 64 similar to the algorithm storage circuit 54, the random data signal device 20A on the communication device 50 side is displayed. By decoding the content of the random data by the random data signal 21a1, an information data signal 61a corresponding to the information data 71a from the IC card processing device 71 is obtained, and this information data signal 61a is sent to the fee collection processing device 81. To give the required fee collection process.
[0012]
Further, in the transmission process from the communication device 60 to the communication device 50, the processing data 81a for the IC card from the charge collection processing device 81 is converted into a random data signal device 20 (hereinafter referred to as 20B) similar to the random data signal device 20A. The CPU 61 performs encryption processing based on the random data signal 21a (hereinafter referred to as 21a2) from the key storage circuit 62, the key data signal 52a from the key storage circuit 62, and the algorithm signal 54a from the algorithm storage circuit 64. A signal obtained by modulating and amplifying the encrypted signal 61b to be transmitted by the communication circuit 65 is defined as a transmission signal 65a, and this transmission signal 65b is transmitted from the antenna 66.
[0013]
In the reception processing in the communication device 50, a signal obtained by amplifying and detecting the reception signal 56a obtained by receiving the transmission signal 65b by the antenna 56 by the communication circuit 55 is used as an encryption signal 56b. Based on the key data signal 52a from the key storage circuit 52 and the algorithm signal 54a from the algorithm storage circuit 54, the random data by the random data signal 21a2 of the random data signal device 20B on the communication device 60 side is decrypted. Then, the processing data signal 51b corresponding to the processing data 81a from the fee collection processing device 81 is obtained, and this processing data signal 51b is given to the IC card processing device 71 to perform the required fee collection processing.
[0014]
And for the above-mentioned secrecy, encryption includes secret expressions used such as meanings hidden in specific sentences, promised word expressions that convert specific words into words according to promises, and promises specific words and sentences Permutation expression that distributes according to the promise, transposition expression that replaces the placement position of the character of a specific sentence or phrase according to the promise, substitution expression that replaces the specific sentence or phrase according to the promise according to the promise, or each of these expressions A configuration using a mixed system in which a plurality of units are appropriately combined (hereinafter referred to as a fourth conventional technology) is disclosed by “Cryptographic Secret” issued by Diamond Corporation in July 1974.
[0015]
Therefore, it is also well known that the above-described algorithm for concealment may be stored as an algorithm obtained by converting any one of the encryptions in the fourth prior art.
[0016]
Needless to say, the white noise signal 12a by the noise signal generator 10 of the first prior art can also be used for measurement of the signal-to-noise ratio, that is, S / N in the communication-related apparatus.
[0017]
[Problems to be solved by the invention]
In the white noise signal 12a generated by the configuration of the first prior art, a noise signal having excellent randomness can be obtained in a wide frequency band from a very low frequency to a very high frequency.
[0018]
On the other hand, with the recent increase in communication speed, the communication frequency band shifts to a very high frequency band, and it is required to speed up the creation of each data in the random data signal 21a according to the configuration of the second prior art. Has been.
[0019]
In order to increase the speed, the low frequency band portion of the white noise signal 12a is removed by, for example, a high-pass filtering circuit, so that only a frequency change in a frequency band higher than a predetermined frequency band is obtained. A configuration in which the generation of the random data signal 21a is increased so as to obtain a white noise signal having a high frequency can be considered.
[0020]
However, in such a configuration, a time portion corresponding to a low frequency band portion is blanked, and the random data signal 21a is interrupted, and there is a disadvantage that it can be created only in the interrupt.
[0021]
In order to solve the above inconvenience, a plurality of noise signal generators 10 are provided, and the blanked portion by a specific noise signal generator 10 is supplemented with a noise signal from another noise signal generator 10. It is conceivable to provide a complicated configuration such as the generation of a sufficient number of noise signals because the generation of the blank portion is random in order to completely eliminate the blank portion. There is a disadvantage that the apparatus 10 must be provided, and the entire apparatus must be complicated and expensive.
[0022]
For this reason, there is a problem that it is desired to provide a noise signal generation apparatus and a utilization apparatus thereof that eliminate these disadvantages.
[0023]
In addition, the noise signal generator 10 according to the first prior art is used as a universal secret communication device in an automobile or the like as in the third prior art, and therefore must be configured in a mass production configuration. However, since the Zener diode 11 is originally manufactured for a constant voltage circuit, its performance is not constant for noise generation.
[0024]
For this reason, among the many Zener diodes, one suitable for noise generation must be selected and used. The selection method for this purpose is to display the generated white noise signal 12a on the cathode ray tube display surface. A method of visually discriminating the frequency change over a long period of time, or a method of incorporating the random data signal device 20 and performing the random test is used.
[0025]
However, these methods are disadvantageous in that in any case, discrimination over a relatively long time is required, which is not suitable for mass production.
[0026]
For this reason, there is a problem that it is desired to provide a noise generating diode without such inconvenience, that is, a noise generating element discriminating device.
[0027]
[Means for Solving the Problems]
The present invention is as described above.
By applying a predetermined reverse bias voltage to the Zener diode, a noise signal having a random frequency change, that is, a noise signal generator for generating a white noise signal,
[0028]
  In order to enhance the randomness, the Zener has a characteristic that a pulsation waveform obtained by amplifying and rectifying the white noise signal when the reverse bias voltage is changed falls within a predetermined waveform range. Noise signal means for obtaining the above white noise signal by a diode;
  In order to obtain the above frequency change in a frequency band higher than a predetermined frequency band, reverse bias means for providing a voltage at a location exceeding the pulsation portion in the pulsation waveform as the reverse bias voltage
  A first configuration providing:
[0029]
  The noise signal means includes an amplifying unit and a rectifying unit for amplifying and rectifying the white noise signal,
  The amplifying unit includes a second configuration that provides gain control means for flattening amplitude fluctuation due to a relatively low frequency component in the white noise signal;
[0030]
By applying a predetermined reverse bias voltage to the Zener diode, a noise signal having a random frequency change, that is, a white noise signal is generated, and a number having a random change based on the white noise signal described above. Or a data signal representing a sign, ie, a random data signal device that obtains a random data signal,
[0031]
  Noise signal means / reverse bias means in the first configuration;A second configuration in which gain control means is provided in the noise signal means of the first configuration.With
Data signal means for obtaining the random data signal based on the frequency change
  Providing the first3And the configuration of
[0032]
By applying a predetermined reverse bias voltage to the Zener diode, a noise signal having a random frequency, that is, a white noise signal is generated, and a random change obtained based on the white noise signal is generated. In a secret communication device that performs communication using a data signal representing a number or a sign, that is, a secret communication signal whose communication content is changed by a random data signal,
[0033]
  Noise signal means / reverse bias means in the first configuration;Gain control means in addition to the noise signal means of the first configurationA second configuration providing the above and a second configuration described above3Data signal means in the configuration of
  This solves the above problem.
[0034]
DETAILED DESCRIPTION OF THE INVENTION
As an embodiment of the present invention, the present invention is applied to the noise signal generating device 10 of the first prior art, the random data signal device 20 of the second prior art, and the secret communication device 100. Each example will be described.
[0035]
【Example】
Examples will be described below with reference to FIGS. 1 to 5, parts denoted by the same reference numerals as those in FIGS. 6 to 9 are parts having the same functions as the parts having the same reference numerals described in FIGS. The part shown with the same code | symbol as FIG. 5 is a part which has the same function as the part of the same code | symbol demonstrated in either of FIG.
[0036]
[First embodiment]
Hereinafter, as a first embodiment, an embodiment of a Zener diode 11 used in the present invention, that is, a noise signal generating element selecting apparatus 200 used for selecting a noise signal generating element will be described with reference to FIG. This noise signal generating element selecting apparatus 200 has a good characteristic by determining whether or not the Zener diode 11 used as the noise generating element in the noise signal generating apparatus 10 has a good characteristic for noise generation. 1 is a device for sorting only the following points where the configuration of FIG. 1 is different from the configuration of FIG.
[0037]
A first different part is provided with a sweep power supply Es for applying a sawtooth wave voltage Vs such as [main part operation waveform] of FIG. 1 to the Zener diode 11 instead of the reverse bias voltage Vb by the DC power supply. This is the place that was constructed.
[0038]
The second different point is that instead of the operational amplifier circuit 12, a white noise signal 11a is supplied to a high frequency transistor, for example, an FET, that is, a field effect transistor via the capacitor C11, and a capacitor coupled amplifier circuit 201 for amplification is provided. By providing, the amplified white noise signal 201a is obtained, and the white noise signal 201a is rectified by the rectifier circuit 202 so as to obtain a rectified signal 202a having a pulsating waveform Ws as shown in [Main Operational Characteristics] of FIG. It is the place that was configured.
[0039]
The rectifying circuit 202 uses the white noise signal 201a as a rectified voltage (not shown) obtained by rectifying with a diode (not shown), for example, and this rectified voltage is used as a high frequency component in the white noise signal 201a. 1 is applied to a filtering circuit (not shown), for example, a combination of a capacitor and a resistor, or a combination of an inductance and a capacitor, to generate a pulsating waveform Ws as shown in [Main Operation Characteristics] of FIG. The rectified signal 202a is obtained. Note that the rectification after amplification as described above is referred to as amplification / rectification in the present invention.
[0040]
The third different place is a place where the display portion 203 is added so that the rectified signal 202a can be observed. The display portion 203 is rectified with the sawtooth voltage Vs, for example, on a cathode ray tube display or an XY recorder. The signal 202a is applied and the rectified signal 202a is swept synchronously with the repetition period Ts of the sawtooth wave voltage Vs, so that the rectified signal 202a is displayed on the display surface as shown in [Main Operational Characteristics] of FIG. This is a place where the voltage Vd can be displayed by waveform display by repeating the pulsation waveform Ws.
[0041]
  The fourth different part is the Zener diode 11 in advance, for example7The Zener diode 11 (G) from which the good white noise signal 11a is obtained is attached to the terminals 11A and 11B by being incorporated in the noise signal generator 10 of the random data signal device 20 according to the second prior art as described above. When displayed on the display portion 203, each pulsation waveform WsA obtained on the display screen is a portion obtained as a characteristic image such as [Noise characteristic good element] in FIG. The image of [element with good noise characteristics] in FIG. 1 is an image obtained by combining a plurality of Zener diodes 11 (G) together. In the case of one Zener diode 11 (G), One of the pulsation waveforms is displayed.
[0042]
  When the Zener diode 11 to be newly selected is attached to the terminals 11A and 11B and displayed on the display portion 203, the fifth different portion is shown in FIG. Compared with a characteristic image such as [element], the pulsation waveform WsB of [element with poor noise characteristic] in FIG.ofIn the zener diode 11 (G), which has a characteristic image with greatly different waveforms and good noise characteristics, the characteristic by the pulsation waveform WsA which is similar to the pulsation waveform WsA of the [noise characteristic good element] in FIG. Since an image can be obtained, a comparison difference (not shown) between the pulsation waveform WsA and the pulsation waveform WsB is displayed, so that only the Zener diode 11 (G) having good noise characteristics can be selected. is there. The image of [Noise characteristic defective element] in FIG. 1 is an image obtained by combining a plurality of defective Zener diodes 11 together. In one defective Zener diode 11, the pulsation shown in FIG. One of the waveforms will be displayed.
[0043]
That is, from the amplitude value Wh1B of the first pulsation waveform Wp1B and the amplitude value Wh2B of the second pulsation waveform Wp2B in the pulsation waveform WsB in the [noise characteristic defective element] of FIG. The difference obtained by subtracting the amplitude value Wh1A of the first pulsation waveform Wp1A and the amplitude value Wh2A of the second pulsation waveform Wp2A in the pulsation waveform WsA of [the element having good noise characteristics] What is within a predetermined allowable range (not shown) is discriminated as a Zener diode 11 (G) having good noise characteristics.
[0044]
The characteristic example of [element with good noise characteristics] and [element with poor noise characteristics] in FIG. 1 is, for example, the case where the Zener diode 11 is a Zener diode for a voltage of 9 V. Characteristics are obtained. It should be noted that since the second pulsation waveforms Wp2A and Wp2B do not appear when the types of the Zener diodes 11 are different, in such a case, it is possible to make a determination corresponding to such pulsation waveforms WsA and WsB. Needless to say, it is good.
[0045]
Further, it goes without saying that the rectification polarity of the rectifier circuit 202 in the configuration of FIG. 1 may be changed to the opposite polarity, and the configuration corresponding to the rectification signal 202a may be configured to correspond to the opposite polarity. .
[0046]
    [Second Embodiment / Third Embodiment]
  Hereinafter, as the second embodiment and the third embodiment, the first embodiment will be described with reference to FIGS.The secondNoise signal generator with the structure10Examples will be described. The configuration of the second embodiment is shown in FIG.6The following points are different from the configuration of the first prior art.
[0047]
  The first different part is as shown in FIG. 3 [Normal amplification type configuration].6In place of the amplification by the operational amplifier circuit 12 in the configuration shown in FIG. 1, the capacitor coupled amplifier circuit 201 is provided to obtain the white noise signal 201a as in the configuration of FIG.
[0048]
  The second different portion is selected as the Zener diode 11 by the noise signal generating element selection device 200 according to the first configuration or the second configuration described above in order to increase the randomness of the frequency change in the white noise signal 11a. The Zener diode 11 (G) having good noise characteristics is used.ThanThis is a location configured to obtain a good white noise signal 11a.
[0049]
The third different point is to obtain a frequency change in a predetermined frequency band, for example, a frequency band higher than a frequency band of 100 kHz or less, so that the white noise signal 11a corresponding to the speeding up of the communication can be obtained. In addition, as the voltage value of the reverse bias voltage Vb, the voltage Vb (G) at a location exceeding the pulsation part in the pulsation waveform WsA, for example, the location exceeding the first pulsation part Wp1A and the second pulsation part Wp2A, for example, In the case where the Zener diode 11 is a Zener diode for a voltage of 9 V, for example, it is a portion configured to give a fixed voltage (hereinafter referred to as a reverse bias voltage Vb (G)) of the reverse bias voltage Vb = 10 V or more.
[0050]
Further, the configuration of the third embodiment is different from the configuration of the second embodiment in that the relatively low frequency component included in the white noise signal 11a is as shown in [AGC amplification type configuration] in FIG. In order to remove the amplitude fluctuation component of the white noise signal 201a due to the influence, the amplifier circuit 201 is changed to a variable amplifier circuit, and the white noise signal 201a is rectified by, for example, an ordinary diode (not shown). A gain control circuit 201A is provided which provides an output obtained through a filtering circuit (not shown) for filtering a frequency slightly lower than the frequency component to be removed later as a control input for controlling the amplification degree in the negative direction. The automatic gain control configuration provided, that is, the AGC configuration.
[0051]
In other words, the configuration of the second and third embodiments is generally as follows:
In the noise signal generator 200 that generates a noise signal having a random frequency change, that is, a white noise signal, for example, a white noise signal 11a, by applying a predetermined reverse bias voltage Vb to the Zener diode 11.
[0052]
In order to enhance the randomness, the pulsating waveform obtained by amplifying and rectifying the white noise signal 11a when the reverse bias voltage Vb is changed, for example, the sawtooth wave voltage Vs is changed. Noise signal means for obtaining the white noise signal 11a by the Zener diode 11 having the characteristic that WsA falls within a predetermined range, that is, the Zener diode 11 (G),
[0053]
  In order to obtain the above-described frequency change in a predetermined frequency band, for example, a frequency band higher than a frequency band of 100 kHz or less, the voltage Vb (G) at a location exceeding the pulsation portions Wp1A and Wp2A in the pulsation waveform WsA, For example, the first configuration provided with reverse bias means for applying a voltage of 10 V or more as the reverse bias voltage Vb.When,
A second configuration in which the noise signal means of the first configuration is provided with gain control means for flattening amplitude fluctuations due to a relatively low frequency component in the white noise signal 11a;
It is what constitutes.
[0054]
  Specifically, in the [normal amplification type configuration] in FIG. 3, the frequency change in the white noise signal 11a is higher than the target frequency change, for example, a predetermined frequency band, for example, a frequency band of 100 kHz or less. In order to obtain the above frequency change in the frequency band, the white noise signal 201a obtained by amplifying the white noise signal 11a by changing the reverse bias voltage Vb is observed with, for example, a cathode ray tube synchroscope. When 11 is a Zener diode for a voltage of 9 V, the reverse bias voltage Vb is set to a small value, for example, 9.1 V corresponding to the vicinity of the Zener voltage Vz, as shown in [Small reverse bias / noise characteristics] in FIG. , Output level fluctuation is large, low frequency band components, for example, many components in the frequency band of 100kHz or lessinclude.
[0055]
  When the reverse bias voltage Vb is a medium value, for example, 9.7 V corresponding to the vicinity of the second pulsation portion Wp2A, the output level fluctuations as shown in [middle reverse bias / noise characteristics] in FIG. Is slightly smaller, but there are still many low frequency band components, for example, components in the frequency band of 100 kHz or less.include.
[0056]
Further, when the reverse bias voltage Vb is set to a large value, for example, 10 V corresponding to the voltage Vb (G) at a location exceeding the pulsation portion WsA, that is, a location exceeding the second pulsation portion Wp2A, the [large] As shown in [Reverse Bias / Noise Characteristics], the output level fluctuation is further reduced, and only a low frequency band component, for example, a white noise component in a high frequency band having no frequency band component of 100 kHz or less. If this voltage Vb (G) is set to 10 V or more, similarly, only the white noise component in the high frequency band is obtained. However, as can be seen from the pulsation waveform WsA in the [noise characteristic good element] in FIG. Since the output of the white noise signal 11a is reduced and the current flowing through the Zener diode 11 (G) is increased to shorten the damage life, it is better to set it at a location of about 10V as much as possible.
[0057]
That is, in order to obtain a frequency change in a target high frequency band, for example, a frequency band exceeding 100 kHz, the pulsation part in the pulsation waveform WsA, that is, the first pulsation part Wp1A and the second pulsation part Wp2A are obtained. In the case of the voltage Vb (G) at the location exceeding, for example, a 9V type Zener diode 11 (G), the reverse bias voltage Vb may be a voltage of 10 V or more. Further, in the [AGC amplification type] in FIG. 3, the amplitude variation due to a relatively low frequency component in the white noise signal 201a obtained by amplifying the white noise signal 11a in the [large reverse bias / noise characteristic] in FIG. Therefore, the white noise signal 201a having a stable amplitude can be obtained.
[0058]
Therefore, according to the first configuration, blanking of the white noise component in the high frequency band caused by the low frequency band part is simply made the reverse bias voltage Vb to the voltage value Vb (G) exceeding the pulsation part. Therefore, it is possible to obtain a white noise signal corresponding to the high-speed communication described above with an apparatus having a very simple configuration.
[0059]
    [Fourth and fifth embodiments]
  Hereinafter, as a third embodiment / fourth embodiment, a random data signal apparatus having the above-described second configuration will be described with reference to FIGS.20Examples will be described. 4 differs from the configuration of the second prior art in FIG. 7 in that the portion of the noise signal generator 10 in the configuration in FIG. 7 is the second in FIG. 2 and FIG. This is a portion configured by changing to the noise signal generator 10 of [ordinary amplification type configuration] in FIG. 3 described in the embodiment. The configuration of the fifth embodiment (not shown) is the same as that of the noise signal generator 10 of FIG. 3 [ordinary amplification type configuration] in FIG. 3 in the above fourth embodiment [AGC amplification type configuration] of FIG. The noise signal generator 10 is changed to the configuration shown in FIG.
[0060]
The conversion circuit 21 in the fourth and fifth embodiments includes random data based on a frequency change having randomness in the white noise signal 11a as described in the second prior art. The signal 21a is configured to be obtained.
[0061]
  In other words, in general,
  By applying a predetermined reverse bias voltage Vb to the Zener diode 11, a noise signal having a random frequency change, that is, a white noise signal 11a is generated, and a random signal is generated based on the white noise signal 11a. In a random data signal device 20 which obtains a data signal representing a number or sign with a change, ie a random data signal 25a or 25b,
[0062]
  Noise signal means / reverse bias means in the first configurationWhen,
A second configuration in which the noise signal means of the first configuration is provided with gain control means for flattening amplitude fluctuations due to a relatively low frequency component in the white noise signal 11a;And providing
Data signal means for obtaining the random data signal based on the frequency change
  Provided the above3It constitutes the configuration.
[0063]
  ThereforeThis first3According to the configuration of the firstThe secondSince the random data signal 21a is obtained on the basis of the white noise signal having the characteristics of the above configuration, the random data signal corresponding to the above-described high-speed communication can also be obtained by an apparatus having a very simple configuration. There is a feature that can be obtained.
[0064]
[Sixth embodiment]
Hereinafter, as a sixth embodiment, an embodiment of the secret communication device 100 having the above third configuration will be described with reference to FIGS. 2, 3, 4, and 5. 5 differs from the configuration of the third prior art in FIG. 9 in that the portion of the random data signal device 20 in the configuration of FIG. 9 is the same as that of FIG. 4 is changed to the random data signal device 20 described in the fourth and fifth embodiments.
[0065]
Then, as described in the third prior art, the portions of the communication devices 50 and 60 are obtained based on a secret communication signal whose communication content is changed by the random data signal 201a, for example, an encryption process. The secret communication device 100 is configured to perform communication using the transmission signals 55a and 65a.
[0066]
In other words, in general,
By applying a predetermined reverse bias voltage Vb to the Zener diode 11, a noise signal having a random frequency change, that is, a white noise signal 11a is generated, and the random signal obtained based on the white noise signal 11a is generated. A data signal representing a number or sign having a gender change, that is, a secret communication signal whose communication content is changed by a random data signal 25a or 25b, for example, each transmission signal 55a and 65a obtained based on an encryption process In the secret communication device 100 that performs communication according to
[0067]
  Above3Like the configuration of
  Noise signal means / reverse bias means in the first configuration;
A second configuration in which the noise signal means of the first configuration is provided with gain control means for flattening amplitude fluctuations due to a relatively low frequency component in the white noise signal 11a;,
Above3Data signal means in the configuration of
  Provided4It constitutes the configuration.
[0068]
  So this second4According to the configuration of the above3Since the random data signal 21a is obtained on the basis of the white noise signal having the characteristics of the above-described configuration, each of the transmission signals obtained based on the encryption processing, for example, the secret communication signal corresponding to the speeding up of the communication described above is obtained. There is a feature that communication by 55a and 65a can also be performed by an apparatus having a very simple configuration.
[0069]
【The invention's effect】
According to the present invention, as described above, the blank portion generated in the high frequency band by the low frequency band portion of the white noise signal obtained by applying the reverse bias voltage to the Zener diode is simply swept by the reverse bias voltage. Therefore, a noise signal generator that generates a white noise signal corresponding to high-speed communication and a random data signal based on the white noise signal can be created. A random data signal device and a secret communication device that obtains a secret communication signal whose communication contents are changed by the random data signal can be obtained by a device having a very simple configuration.
[Brief description of the drawings]
1 to 6 show an embodiment of the present invention, and FIGS. 7 to 10 show the prior art. The contents of each figure are as follows.
FIG. 1 is a block diagram of the overall block configuration, main part operating characteristics, and main part display configuration.
[Fig. 2] Main part operating characteristics
FIG. 3 is an overall block diagram.
FIG. 4 is an overall block diagram.
FIG. 5 is an overall block diagram.
FIG. 6 is an overall block diagram.
FIG. 7 is an overall block diagram.
[Fig. 8] Principal operation characteristics diagram
FIG. 9 is an overall block diagram.
[Explanation of symbols]
10 Noise signal generator
11 Zener diode
11 (G) Zener diode
11A terminal
11B terminal
11a White noise signal
12 Operational amplifier circuit
12a White noise signal
20 Random data signal device
20A random data signal device
20B Random data signal device
21 Conversion circuit
21a Random data signal
21a1 Random data signal
21a2 Random data signal
50 Communication device
51 CPU
51a Encryption signal
51b Processed data signal
52 Key memory circuit
52a Key data signal
54 Algorithm storage circuit
54a Algorithm signal
55 Communication circuit
55a Transmission signal
56 Antenna
56a Received signal
56b Encryption signal
60 Communication device
61 CPU
61a Information data signal
61b Encryption signal
62 Key storage circuit
64 Algorithm circuit
65 Communication circuit
65a Encryption signal
65b Transmission signal
66 Antenna
66a Received signal
65 Communication circuit
70 cars
71 IC card processing device
71a Information data
80 Tollgate
81 Charge collection device
81a Processing data
100 Secret communication device
200 Element selection device for noise signal generation
201 Capacitor-coupled amplifier circuit
202 Rectifier circuit
202a Rectified signal
203 Display part
C1 capacitor
R1 resistance
R1 resistance
R3 resistance
Ts Repeat cycle
Vb reverse bias voltage
Vb (G) Reverse bias voltage
Vs sawtooth voltage
Vz Zener voltage
Wh1A amplitude value
Wh1B amplitude value
Wh2A amplitude value
Wh2B amplitude value
Wp1A 1st pulsation part
Wp1B first pulsation part
Wp2A Second pulsation part
Wp2B second pulsation part
WsA pulsation waveform
WsB pulsation waveform

Claims (3)

A noise signal generator that generates a noise signal having a random frequency change (hereinafter referred to as a white noise signal) by applying a predetermined reverse bias voltage to a Zener diode,
In order to increase the randomness, the white noise is generated by the Zener diode having a characteristic that a pulsation waveform obtained by amplifying and rectifying the white noise signal when the reverse bias voltage is changed falls within a predetermined waveform range. Noise signal means for obtaining a noise signal;
In order to obtain the frequency change in a frequency band higher than a predetermined frequency band, reverse bias means for providing a voltage at a location exceeding the pulsation part in the pulsation waveform as the reverse bias voltage;
The noise signal means includes an amplifying unit and a rectifying unit for amplifying and rectifying the white noise signal,
The amplifying unit is a gain control means for flattening amplitude fluctuation due to a relatively low frequency component in the white noise signal;
A noise signal generator comprising: When a predetermined reverse bias voltage is applied to the Zener diode, a noise signal having a random frequency change (hereinafter referred to as a white noise signal) is generated, and the random signal is changed based on the white noise signal. A random data signal device for obtaining a data signal representing a number or sign (hereinafter referred to as a random data signal),
In order to increase the randomness of the frequency change, the Zener diode has a characteristic that a pulsation waveform obtained by amplifying and rectifying the white noise signal when the reverse bias is changed falls within a predetermined waveform range. Noise signal means for obtaining the white noise signal;
In order to obtain the frequency change in a frequency band higher than a predetermined frequency band, reverse bias means for providing a voltage at a location exceeding the pulsation part in the pulsation waveform as the reverse bias voltage;
Data signal means for obtaining the random data signal based on the frequency change,
The noise signal means includes an amplifying unit and a rectifying unit for amplifying and rectifying the white noise signal,
The amplifying unit includes gain control means for flattening amplitude fluctuations due to a relatively low frequency component in the white noise signal.
Random data signal apparatus comprising: a. By applying a predetermined reverse bias voltage to the Zener diode, a noise signal having a random frequency (hereinafter referred to as a white noise signal) is generated, and a random change obtained based on the white noise signal is generated. A secret communication device that performs communication using a secret communication signal whose communication content is changed by a data signal (hereinafter referred to as a random data signal) that represents a number or a sign of
In order to increase the randomness of the frequency change, the Zener diode has a characteristic that a pulsation waveform obtained by amplifying and rectifying the white noise signal when the reverse bias is changed falls within a predetermined waveform range. Noise signal means for obtaining the white noise signal;
In order to obtain the frequency change in a frequency band higher than a predetermined frequency band, reverse bias means for providing a voltage at a location exceeding the pulsation part in the pulsation waveform as the reverse bias voltage;
Data signal means for obtaining the random data signal based on the frequency change ,
The noise signal means includes an amplifying unit and a rectifying unit for amplifying and rectifying the white noise signal,
The amplifying unit is a gain control means for flattening amplitude fluctuation due to a relatively low frequency component in the white noise signal
The secret communication device comprising: a.

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