JP2016139363A - Encryption processing device, encryption processing method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an encryption processing device capable of enhancing security level further in order to prevent information leakage.SOLUTION: An encryption processing device includes an electrostatic capacity sensor and an encryption processing unit. The electrostatic capacity sensor whose electrostatic capacity value is changed in accordance with ambient environment, outputs a sensor signal which changes in accordance with the change of the electrostatic capacity value. The encryption processing unit encrypts encryption target data according to the sensor signal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cryptographic processing device, a cryptographic processing method, and a program.

There are various apparatuses related to encryption and decryption in order to prevent information leakage.
Japanese Patent Application Laid-Open No. 2004-228688 describes a related technique that has high security and can select a valid key from a plurality of encrypted content keys with a small number of operations.

JP 2003-78517 A

  By the way, in order to prevent information leakage, there has been a demand for a technique that can further increase the security level and prevent a decrease in throughput.

  Therefore, an object of the present invention is to provide a cryptographic processing apparatus, a cryptographic processing method, and a program that can solve the above-described problems.

  In order to achieve the above object, the present invention provides a capacitance sensor that changes a capacitance value according to an ambient environment and outputs a sensor signal that changes according to a change in the capacitance value, and the sensor And a cryptographic processing unit that encrypts data to be encrypted based on a signal.

  Further, the present invention outputs a sensor signal that changes in capacitance value according to the surrounding environment, changes in accordance with the change in the capacitance value, and encrypts data to be encrypted based on the sensor signal. This is an encryption processing method.

  The present invention also provides an encryption processing means for encrypting data to be encrypted based on a sensor signal whose capacitance value changes in accordance with the surrounding environment and changes in accordance with the change in the capacitance value. It is a program that functions as.

  By the processing of the cryptographic processing apparatus of the present invention, it is possible to further increase the security level in order to prevent information leakage.

It is a figure which shows the minimum structure of the encryption processing apparatus of this invention. It is a figure which shows the example of a system provided with the encryption processing apparatus by 1st embodiment of this invention. It is a figure which shows the encryption processing apparatus by 1st embodiment of this invention. It is a figure which shows the decoding processing apparatus by 1st embodiment of this invention. It is a figure which shows the data table which the memory | storage part by 1st embodiment of this invention memorize | stores. It is a figure which shows the processing flow of the encryption processing apparatus by 1st embodiment of this invention. It is a figure which shows the encryption processing apparatus by 2nd embodiment of this invention. It is a figure which shows the processing flow of the encryption processing apparatus by 2nd embodiment of this invention. It is a figure which shows the image of the update of the key data by 2nd embodiment of this invention. It is a figure which shows the acquisition example of the sensor signal in the system by embodiment of this invention.

As shown in FIG. 1, the cryptographic processing apparatus 10 of the present invention includes at least a capacitance sensor 101 and a cryptographic processing unit 102.
The capacitance sensor 101 changes the capacitance value according to the surrounding environment that changes every moment, and outputs a sensor signal that changes according to the change in the capacitance value.
The encryption processing unit 102 encrypts data to be encrypted based on the sensor signal.

<First embodiment>
First, an example of a system including the cryptographic processing device 10 according to the first embodiment of the present invention will be described.
An example of a system including the cryptographic processing device 10 according to the first embodiment is the cryptographic processing system 1. As shown in FIG. 2, the cryptographic processing system 1 includes a server 30 and a computer 40. The server 30 includes the cryptographic processing device 10. The computer 40 includes a decoding processing device 20.

The cryptographic processing apparatus 10 generates a sensor signal of a capacitance sensor whose capacitance value changes momentarily according to the surrounding environment that changes momentarily, and changes momentarily according to the change of the capacitance value. Based on this, the information (data to be encrypted) transmitted from the server 30 to the computer 40 is encrypted. Data after encrypting the data to be encrypted is referred to as encrypted data. For example, the cryptographic processing apparatus 10 generates a sensor signal (analog signal) that changes from time to time according to the ambient temperature and humidity that change from time to time, and the surrounding environment such as a person who enters the server room (sensing target). D (Analog to Digital) conversion. This digital signal after A / D conversion is a signal indicating an unpredictable value because it is a signal based on a sensor signal corresponding to the surrounding environment that changes every moment that cannot be predicted. The cryptographic processing apparatus 10 encrypts information transmitted from the server 30 to the computer 40 using a digital signal indicating an unpredictable value as key data. Also, the cryptographic processing apparatus 10 records a data table indicating the correspondence between the data to be encrypted and the key data used for the encryption in the storage unit.
As described above, the server 30 encrypts information to be transmitted to the computer 40. Then, the server 30 transmits the information encrypted by the cryptographic processing device 10 and information indicating the correspondence between the data to be encrypted and the key data used for the encryption to the computer 40.
When the computer 40 receives from the server 30 information encrypted by the cryptographic processing device 10 and information indicating the correspondence between the data to be encrypted and the key data used to encrypt the encrypted data, the decryption processing device 20 specifies the key data used for encryption based on information indicating the correspondence between the data to be encrypted and the key data used for the encryption. Then, the decryption processing device 20 decrypts the encrypted information using the specified key data.
As described above, the computer 40 decrypts the encrypted information received from the server 30.

Next, the configuration of the cryptographic processing device 10 according to the first embodiment of the present invention will be described.
As shown in FIG. 3, the cryptographic processing apparatus 10 according to the first embodiment includes a capacitance sensor 101, a cryptographic processing unit 102, a communication unit 103, a storage unit 104, a timer 105, and A / D conversion. A unit 106 and an infrared sensor 107.

  The capacitance sensor 101 changes the capacitance value according to the surrounding environment that changes every moment, and outputs a sensor signal that changes according to the change in the capacitance value. Here, the sensor signal output from the capacitance sensor 101 is an unpredictable signal that changes according to the surrounding environment that changes every moment. The capacitance sensor 101 is, for example, a proximity sensor, and a large variation occurs in the capacitance value due to manufacturing variation for each capacitance sensor. Therefore, even if the surrounding environment is the same, the capacitance sensor 101 outputs different sensor signals for each individual.

The encryption processing unit 102 encrypts the data to be encrypted based on the sensor signal output from the capacitance sensor 101. For example, the encryption processing unit 102 encrypts information transmitted from the server 30 to the computer 40 using, as key data, a digital signal obtained by A / D converting the sensor signal by the A / D conversion unit 106. The encryption processing unit 102 records the correspondence between the data to be encrypted and the key data used for the encryption in the storage unit 104. For example, the encryption processing unit 102 records in the storage unit 104 a data table TBL1 indicating the correspondence between the encryption target data and the key data used for the encryption as shown in FIG.
When the infrared sensor 107 detects a person, the encryption processing unit 102 increases the frequency per unit time for encrypting the encryption target data based on the sensor signal. The encryption processing unit 102 performs control to output the value indicated by the digital signal as it is without performing calibration to the A / D conversion unit 106 when encrypting the data to be encrypted.
In addition, the encryption processing unit 102 periodically encrypts the encryption target data based on the sensor signal when no human is detected.
The cryptographic processing unit 102 also outputs an initialization signal for initializing the timer 105 to the timer 105.

The communication unit 103 communicates with the computer 40 via a communication line such as a LAN (Local Area Network).
The storage unit 104 stores information necessary for various processes performed by the cryptographic processing apparatus 10. The storage unit 104 stores information that the server 30 transmits to the computer 40.

The timer 105 measures time. For example, the timer 105 is a timer that measures time based on the number of rising times of a clock signal with a constant period counted by the counter.
The A / D conversion unit 106 samples the sensor signal output from the capacitance sensor 101 in accordance with the instruction signal input from the encryption processing unit 102. The A / D conversion unit 106 converts the sampled sensor signal into a digital signal. For example, the digital signal after the conversion by the A / D conversion unit 106 is (1010101110101011) ₂ = (ABAB) ₁₆ . Then, the A / D conversion unit 106 outputs the converted digital signal to the encryption processing unit 102.
The infrared sensor 107 detects a nearby person. The infrared sensor 107 outputs a person detection signal indicating the proximity to the encryption processing unit 102 when a person approaches.

Next, the configuration of the decryption processing device 20 according to the first embodiment of the present invention will be described.
As illustrated in FIG. 4, the decoding processing device 20 according to the first embodiment includes a communication unit 201, a decoding processing unit 202, and a storage unit 203.

The communication unit 201 communicates with the server 30 via a communication line such as a LAN.
The decryption processing unit 202 decrypts the encryption target data encrypted by the encryption processing unit 102 based on the sensor signal.
The storage unit 203 stores information necessary for various processes performed by the decoding processing device 20.

Next, the processing flow of the cryptographic processing apparatus 10 in the cryptographic processing system 1 according to the first embodiment of the present invention shown in FIG. 6 will be described.
Here, the encryption processing of the data to be encrypted performed by the cryptographic processing device 10 when the server 30 including the cryptographic processing device 10 is installed in the server room will be described.
The encryption processing apparatus 10 performs control to output the value indicated by the digital signal as it is without performing calibration to the A / D conversion unit 106, and performs processing to encrypt the data to be encrypted. And

The cryptographic processing unit 102 included in the cryptographic processing apparatus 10 outputs an initialization signal for initializing the timer 105 to the timer 105.
When the timer 105 receives the initialization signal from the encryption processing unit 102, the timer 105 initializes the timer according to the input initialization signal (step S1). For example, when the timer 105 is a timer that measures time based on the number of rises of the clock signal counted by the counter, the timer 105 resets the count to 0 when the initialization signal is input from the encryption processing unit 102. Then, the timer 105 starts measuring time.
The timer 105 outputs the measured time to the encryption processing unit 102. For example, the timer 105 outputs the count number to the encryption processing unit 102 every time the count of the counter increases.

The encryption processing unit 102 outputs a conversion instruction signal instructing conversion of the sensor signal output from the capacitance sensor 101 into a digital signal to the A / D conversion unit 106 (step S2).
When the conversion instruction signal is input from the encryption processing unit 102, the A / D conversion unit 106 samples the sensor signal output from the capacitance sensor 101 in accordance with the input conversion instruction signal. The A / D conversion unit 106 converts the sampled sensor signal into a digital signal (step S3). For example, the digital signal after the conversion by the A / D conversion unit 106 is (1010101110101011) ₂ = (ABAB) ₁₆ . Then, the A / D conversion unit 106 outputs the converted digital signal to the encryption processing unit 102.
When the digital signal is input from the A / D conversion unit 106, the encryption processing unit 102 encrypts a certain amount of data to be encrypted read from the storage unit 104 using the input digital signal as key data (step S4). ). For example, a certain amount of data to be encrypted can be encrypted within 50 microseconds by converting the sensor signal sampled by the A / D conversion unit 106 into a digital signal and the digital signal by the encryption processing unit 102 as key data. The amount of data is such that data encryption can be completed. At this time, the encryption processing unit 102 records, in the storage unit 104, a data table TBL1 indicating the correspondence between a certain amount of encryption target data and the key data used for the encryption (step S5).

  The infrared sensor 107 constantly detects a person in the server room. The cryptographic processing unit 102 acquires a human detection signal indicating the presence or absence of a human from the infrared sensor 107 every time the time input from the timer 105 elapses for a certain time (for example, every 50 microseconds). Then, the encryption processing unit 102 determines whether or not a person is detected in the server room based on the person detection signal acquired from the infrared sensor 107 (step S6). When the human detection signal is a signal indicating human detection, the cryptographic processing unit 102 determines that a human is detected in the server room. In addition, when the human detection signal is a signal that does not indicate human detection, the cryptographic processing unit 102 determines that a human is detected in the server room.

When it is determined that no human is detected in the server room (step S6, NO), the cryptographic processing unit 102 determines whether or not the time input from the timer 105 has passed a predetermined time (for example, 10 minutes). (Step S7).
If the cryptographic processing unit 102 determines that a predetermined time (for example, 10 minutes) has elapsed (YES in step S7), the cryptographic processing unit 102 returns to the process in step S3.
If the cryptographic processing unit 102 determines that a predetermined time (for example, 10 minutes) has not elapsed (NO in step S7), the cryptographic processing unit 102 returns to the process in step S4.

In addition, when it is determined that a human is detected in the server room (step S6, YES), the cryptographic processing unit 102 is shorter than a predetermined time (for example, 10 minutes) when it is determined that no human is detected in the server room. It is determined whether time (for example, 100 microseconds) has elapsed (step S8).
If the cryptographic processing unit 102 determines that a fixed time (for example, 100 microseconds) that is shorter than the fixed time when it is determined that no human is detected in the server room has elapsed (step S8, YES), the process proceeds to step S3. return.
Also, if the cryptographic processing unit 102 determines that a certain time (for example, 100 microseconds) shorter than the certain time when it is determined that no human is detected in the server room has elapsed (NO in step S8), the encryption processing unit 102 proceeds to step S4. Return to processing.

In the cryptographic processing system 1, the server 30 transmits to the computer 40 the information encrypted by the cryptographic processing device 10 and information indicating the correspondence between the data to be encrypted and the key data used for the encryption. .
When the computer 40 receives from the server 30 the information encrypted by the encryption processing device 10 and the information indicating the correspondence between the data to be encrypted and the key data used for the encryption, the decryption processing device 20 The key data used for the encryption is specified based on the information indicating the correspondence between the data to be encrypted and the key data used for the encryption. Then, the decryption processing device 20 decrypts the encrypted information using the specified key data.

The cryptographic processing apparatus 10 according to the first embodiment of the present invention has been described above. In the cryptographic processing apparatus 10 described above, the capacitance sensor 101 changes the capacitance value according to the surrounding environment, and sends the sensor signal that changes according to the change in the capacitance value to the A / D conversion unit 106. To the cryptographic processing unit 102. The encryption processing unit 102 encrypts data to be encrypted based on the sensor signal.
By doing so, it is possible to further increase the security level in order to prevent information leakage.

<Second Embodiment>
Next, the cryptographic processing system 1 including the cryptographic processing device 10 according to the second embodiment of the present invention will be described.
The difference between the cryptographic processing system 1 according to the second embodiment and the cryptographic processing system 1 according to the first embodiment is the cryptographic processing device 10.

  As shown in FIG. 7, the cryptographic processing apparatus 10 according to the second embodiment includes a capacitance sensor 101, a cryptographic processing unit 102, a communication unit 103, a storage unit 104, a timer 105, and A / D conversion. Unit 106.

  The capacitance sensor 101 changes the capacitance value according to the surrounding environment that changes every moment, and outputs a sensor signal that changes according to the change in the capacitance value. In addition, the capacitance sensor 101 detects a nearby person. The capacitive sensor 101 outputs a human detection signal indicating the proximity to the encryption processing unit 102 when a human approaches.

The encryption processing unit 102 encrypts the data to be encrypted based on the sensor signal output from the capacitance sensor 101.
The encryption processing unit 102 records the correspondence between the data to be encrypted and the key data used for the encryption in the storage unit 104.
The encryption processing unit 102 is a unit time for encrypting the data to be encrypted based on the sensor signal when the capacitance sensor 101 detects a human and the capacitance value of the capacitance sensor 101 changes. Increase the hit frequency.
When the electrostatic capacity sensor 101 detects a human (predetermined sensing target), the cryptographic processing unit 102 reduces the amount of information other than information indicating human detection in the digital signal, and the electrostatic capacity sensor 101 detects the human. Control (calibration) is performed on the A / D conversion unit 106 to reduce the variation in the value of the sensor signal when it is detected.
Here, the control for reducing the amount of information other than information indicating human detection in the digital signal, for example, lowers the sensitivity to changes in the surrounding environment other than human entry into the server room, and reduces human entry into the server room. In this control, information other than bits used for the presence / absence determination is fixed. The cryptographic processing unit 102 controls the A / D conversion unit 106 to output bits that are not used to determine whether or not a person has entered the server room in the converted digital signal as a fixed value and output an approximate value. Do. Specifically, for example, when the bit used for determining whether or not a person enters the server room in the digital signal is the 10th bit from the least significant bit, the encryption processing unit 102 sends the A / D conversion unit 106 the lower 9 bits of the digital signal _{(1010101110101011) 2,} 0 _{(1010101000000000)} approximates ₂ performs control to output Te.
In addition, for example, the encryption processing unit 102 controls the A / D conversion unit 106 to reduce the amount of information other than information indicating human detection in the digital signal, from among all the bits of the converted digital signal. Control is performed to output only the bits that can be determined to be detected. Specifically, for example, when it is possible to determine that a person has been detected when the 10th bit is 1 from the least significant bit of the digital signal (1010101110101011) ₂ after being converted by the A / D conversion unit 106 The encryption processing unit 102 controls the A / D conversion unit 106 to output only the value of the 10th bit (“1” in the example shown here) counted from the least significant bit.
In addition, for example, the A / D conversion unit 106 that converts the sensor signal output from the capacitance sensor 101 into a digital signal is control for reducing variation in the value of the sensor signal when the capacitance sensor 101 detects a person. In contrast, when a person enters the server room, control is performed to change the 10th bit from the least significant bit.
The cryptographic processing unit 102 performs such control on the A / D conversion unit 106, thereby reducing the amount of information to be processed and preventing the throughput from decreasing.

Next, the processing flow of the cryptographic processing apparatus 10 in the cryptographic processing system 1 according to the second embodiment of the present invention shown in FIG. 8 will be described.
Here, the encryption processing of the data to be encrypted performed by the cryptographic processing device 10 when the server 30 including the cryptographic processing device 10 is installed in the server room will be described.
Here, the processes of step S10 and step S11, which are different from the cryptographic processing apparatus 10 according to the first embodiment, will be described.

Similar to the cryptographic processing apparatus 10 according to the first embodiment, the cryptographic processing apparatus 10 performs the process of step S1 for initializing a timer and the process of step S2 for instructing conversion.
The cryptographic processing unit 102 performs request control to output the value indicated by the digital signal as it is without performing calibration to the A / D conversion unit 106 (step S10). For example, the encryption processing unit 102 outputs a control signal to the A / D conversion unit 106. When the control signal is input from the encryption processing unit 102, the A / D conversion unit 106 outputs to the encryption processing unit 102 only the bits that can be determined to have detected a human among all the bits of the digital signal according to the input control signal. It becomes a state to do.

  The cryptographic processing device 10 performs the process of step S3 for converting the sensor signal into a digital signal, the process of step S4 for encrypting the fixed amount of encryption target data read from the storage unit 104, the fixed amount of encryption target data and the data The process of step S5 for recording the data table TBL1 indicating the correspondence with the key data used for encryption in the storage unit 104 is performed.

The cryptographic processing unit 102 performs control to reduce the amount of information other than information indicating human detection in the digital signal, and to reduce variation in the value of the sensor signal when the capacitance sensor 101 detects the human (the digital signal Control to be corrected, that is, calibration) is performed on the A / D converter 106 (step S11).
Then, in the cryptographic processing apparatus 10, the cryptographic processing unit 102 performs the process of step S <b> 6 for determining whether or not a human is detected in the server room based on the human detection signal acquired from the capacitance sensor 101.

When it is determined that no human is detected in the server room (step S6, NO), the cryptographic processing unit 102 determines whether or not the time input from the timer 105 has passed a predetermined time (for example, 10 minutes). The process of step S7 is performed.
If it is determined that a predetermined time (for example, 10 minutes) has elapsed (YES in step S7), the cryptographic processing unit 102 returns to the process in step S10.
If the cryptographic processing unit 102 determines that a predetermined time (for example, 10 minutes) has not elapsed (NO in step S7), the cryptographic processing unit 102 returns to the process in step S4.

In addition, when it is determined that a human is detected in the server room (step S6, YES), the cryptographic processing unit 102 is shorter than a predetermined time (for example, 10 minutes) when it is determined that no human is detected in the server room. Step S8 is performed to determine whether or not time (for example, 100 microseconds) has elapsed.
If the cryptographic processing unit 102 determines that a certain time (for example, 100 microseconds) shorter than the certain time when it is determined that no human is detected in the server room has elapsed (YES in step S8), the process proceeds to step S10. return.
Also, if the cryptographic processing unit 102 determines that a certain time (for example, 100 microseconds) shorter than the certain time when it is determined that no human is detected in the server room has elapsed (NO in step S8), the encryption processing unit 102 proceeds to step S4. Return to processing.

FIG. 9 is a diagram showing an image of updating key data according to the second embodiment of the present invention. In FIG. 9, A indicates the state of the capacitance sensor 101. B indicates the state of the key data. C represents a key data update factor. Further, t1 to t7 indicate time.
Each of the period T1 starting from time t1, the period T2 starting from time t2,..., And the period T7 starting from time t7 outputs the value indicated by the digital signal as it is without performing calibration by the A / D converter 106. It is a period. The cryptographic processing device 10 generates key data based on the sensor signal during this period. In each of the other periods, the A / D conversion unit 106 reduces the amount of information other than information indicating human detection in the digital signal, and the sensor signal when the electrostatic capacity sensor 101 detects human beings. This is a period in which a digital signal is output after correction for reducing the variation in value.
As indicated by the update factor C of the key data, each of the times t1, t2, and t7 is a time when it is determined that a predetermined time (for example, 10 minutes) predetermined based on the timer 105 has elapsed (in FIG. 9). , A1 to a3). Each of the times t3 to t6 is a time when the capacitance sensor 101 detects a person (in FIG. 9, b1 to b4 correspond).
Further, as can be seen from the state B of the key data and the timing from time t1 to time t7, key data is frequently generated while a person is detected. The key data (ABAB) ₁₆ generated in the period T1 is used until the next period T2 ends. The key data (CDCD) ₁₆ generated in the period T2 is used until the next period T3 ends. Similarly, key data generated in a certain period is used until the next period ends.

In the cryptographic processing system 1, the server 30 transmits to the computer 40 the information encrypted by the cryptographic processing device 10 and information indicating the correspondence between the data to be encrypted and the key data used for the encryption. .
When the computer 40 receives from the server 30 the information encrypted by the encryption processing device 10 and the information indicating the correspondence between the data to be encrypted and the key data used for the encryption, the decryption processing device 20 The key data used for the encryption is specified based on the information indicating the correspondence between the data to be encrypted and the key data used for the encryption. Then, the decryption processing device 20 decrypts the encrypted information using the specified key data.

The cryptographic processing apparatus 10 according to the second embodiment of the present invention has been described above. In the cryptographic processing device 10 described above, the capacitance sensor 101 changes its capacitance value according to the surrounding environment that changes every moment, and outputs a sensor signal that changes according to the change in the capacitance value. . In addition, the capacitance sensor 101 detects a nearby person. The capacitive sensor 101 outputs a human detection signal indicating the proximity to the encryption processing unit 102 when a human approaches.
By doing so, it is possible to reduce the number of dedicated sensors for detecting humans such as infrared sensors.
In the cryptographic processing apparatus 10 described above, the cryptographic processing unit 102 reduces the amount of information other than information indicating human detection in a digital signal when the capacitance sensor 101 detects a human (predetermined sensing target). At the same time, the A / D conversion unit 106 is controlled to reduce variations in sensor signal values when the capacitance sensor 101 detects a person.
By doing so, it is possible to reduce the amount of information processed by the cryptographic processing unit 102 and prevent the throughput from decreasing.

In the embodiment of the present invention, the encryption processing unit 102 reduces (including 0) the frequency per unit time for encrypting the data to be encrypted based on the sensor signal when no human is detected. It may be.
In the embodiment of the present invention, the A / D conversion unit 106 samples the sensor signal output from the capacitance sensor 101 a plurality of times, and combines a plurality of digital signals obtained by converting each sampled value into a digital value. Key data may be generated.
In the embodiment of the present invention, the encryption processing unit 102 embeds the key data information used for encryption in the encrypted information and transmits the encrypted information to the computer 40 via the communication unit 103. It may be a thing.
Further, in the embodiment of the present invention, the encryption processing unit 102 does not use the digital signal output from the A / D conversion unit 106 as key data, but may further generate random numbers as key data. Good. For example, the cryptographic processing unit 102 may generate a random number using the digital signal output from the A / D conversion unit 106 as an input of a hash function, and use the random number as key data.

  In the cryptographic processing system 1 according to the embodiment of the present invention, the server 30 includes information encrypted by the cryptographic processing device 10, information indicating the correspondence between the encryption target data and the key data used for the encryption, and Has been described as being transmitted to the computer 40. When the computer 40 receives from the server 30 information encrypted by the cryptographic processing device 10 and information indicating the correspondence between the data to be encrypted and the key data used for the encryption, the decryption processing device 20 Identifies the key data used for encryption based on the information indicating the correspondence between the data to be encrypted and the key data used for the encryption, and decrypts the information encrypted using the specified key data Explained as what to do. However, in the cryptographic processing system 1 according to the embodiment of the present invention, the server 30 may not transmit the encrypted information to the computer 40. The server 30 may include the cryptographic processing device 10 and generate key data that the cryptographic processing device 10 uses to encrypt the data to be encrypted. The server 30 may include the cryptographic processing device 10 and encrypt the encryption target data using the key data generated by the cryptographic processing device 10.

  Further, in the cryptographic processing system 1 according to the embodiment of the present invention, as shown in FIG. 10, each of the cryptographic processing device 10 included in the server 30 and the decryption processing device 20 included in the computer 40 has the same capacitance sensor. The sensor signal may be acquired from the same timing from 101, and key data may be generated based on the sensor signal acquired by each of the encryption processing device 10 and the decryption processing device 20.

  Note that the storage unit and the memory in the present invention may be provided anywhere as long as appropriate information is transmitted and received. A plurality of storage units and memories may exist in a range in which appropriate information is transmitted and received, and data may be distributed and stored.

  In the processing flow according to the embodiment of the present invention, the order of processing may be changed within a range where appropriate processing is performed.

  In addition, although embodiment of this invention was described, the above-mentioned encryption processing apparatus 10 and the decryption processing apparatus 20 have a computer system inside. The process described above is stored in a computer-readable storage unit in the form of a program, and the above process is performed by the computer reading and executing this program. Here, the computer-readable storage means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

  The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. Various omissions, replacements, and changes can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 ... Cryptographic processing system 10 ... Cryptographic processing device 20 ... Decryption processing device 30 ... Server 40 ... Computer 101 ... Capacitance sensor 102 ... Cryptographic processing units 103, 201 ..Communication unit 104, 203 ... storage unit 105 ... timer 106 ... A / D conversion unit 107 ... infrared sensor 202 ... decoding processing unit TBL ... data table

Claims (7)

A capacitance sensor that changes a capacitance value according to the surrounding environment and outputs a sensor signal that changes according to the change in the capacitance value; and
An encryption processing unit that encrypts data to be encrypted based on the sensor signal;
A cryptographic processing apparatus comprising: The cryptographic processing unit acquires a sensor signal that changes according to a change in the capacitance value that changes based on the surrounding environment when a predetermined sensing target is not detected, and acquires the sensor signal. Encrypting the data to be encrypted based on the sensor signal
The cryptographic processing apparatus according to claim 1. When the predetermined processing target is detected, the encryption processing unit changes the predetermined time interval to a short time, and encrypts the encryption target data based on the sensor signal.
The cryptographic processing apparatus according to claim 2. If the predetermined sensing object is no longer detected after detecting the predetermined sensing object, the encryption processing unit returns to the predetermined time interval when the predetermined sensing object is not detected, and Encrypting the data to be encrypted based on a sensor signal;
The cryptographic processing apparatus according to claim 3. An A / D converter that converts the sensor signal into a digital signal and outputs the digital signal to the encryption processor;
With
When the capacitance sensor detects the predetermined sensing target, the encryption processing unit is configured to receive an information amount other than information indicating detection of the predetermined sensing target in the digital signal with respect to the A / D conversion unit. When the data to be encrypted is encrypted, the A / D converter is controlled to output the value indicated by the digital signal as it is.
The cryptographic processing apparatus according to any one of claims 2 to 4. The capacitance value changes according to the surrounding environment, and a sensor signal that changes according to the change in the capacitance value is output.
An encryption processing method for encrypting data to be encrypted based on the sensor signal. Computer
An encryption processing unit that encrypts data to be encrypted based on a sensor signal that changes in capacitance value according to the surrounding environment and changes in accordance with the change in capacitance value;
Program to function as.

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