JP3874456B2 - Security processing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a security processing apparatus in which a measurement terminal for outputting a signal for adjusting a data processing circuit is provided so as to be exposed to the outside .
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a processing apparatus that processes a medium on which predetermined data is recorded, such as a magnetic card or an IC card, for example, the data recorded on the medium is read and analyzed, and predetermined new data is also recorded on the medium. The data processing circuit for recording is incorporated. This data processing circuit is subjected to processing (hereinafter simply referred to as security processing) so as not to know what means is being processed from the viewpoint of enhancing the security of the medium.
[0003]
Incidentally, even in the data processing circuit security processing described above is performed, at the time of manufacture or during subsequent maintenance, along with the data processing circuit is made whether the check for proper operation, normally Each component is adjusted to operate.
[0004]
For this adjustment work, an adjustment device such as an oscilloscope is connected to the measurement terminal exposed to the outside from the circuit board whose inside is sealed, and the output state of the measurement terminal is monitored. Is called.
[0005]
[Problems to be solved by the invention]
As described above, in the conventional data processing circuit subjected to the security processing, the operation terminal for operation check or adjustment is exposed to the outside, so that the adjustment device is inadvertently connected to the measurement terminal. There was a concern that it could be used for security estimation of data processing circuits.
[0006]
To overcome such concerns, omitting measuring terminal, or it is considered that so as not to expose to the outside the measurement terminal from the circuit board, in this case, adjustment is extremely difficult As a result, there arises a new problem that hinders production and makes maintenance and inspection difficult.
[0007]
Accordingly, the present invention has been made to solve the above-described drawbacks, and an object of the present invention is to provide a security processing apparatus that cannot perform security estimation even when a measurement terminal is exposed to the outside. It is in.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a security processing apparatus in which a measurement terminal for outputting a signal for adjusting a data processing circuit subjected to security processing is provided exposed to the outside . A switch circuit is provided that outputs a signal for adjusting the data processing circuit to the measurement terminal when a predetermined switch switching encryption signal or switch switching program data is input from the outside.
According to a second aspect of the present invention, there is provided a security processing apparatus in which a measurement terminal for outputting a signal for adjusting a data processing circuit subjected to security processing is provided so as to be exposed to the outside. When a predetermined modulation stop encryption signal is input from the outside, the modulation processing of the output to the measurement terminal is stopped and a signal for adjusting the data processing circuit is output. A modulation circuit is provided.
According to a third aspect of the present invention, there is provided a security processing apparatus in which a measurement terminal for outputting a signal for adjusting a data processing circuit subjected to security processing is provided so as to be exposed to the outside. To adjust the data processing circuit by changing the gain of the amplification process output to the measurement terminal when a predetermined gain conversion encryption signal is input from the outside without changing the gain of the amplification process output to An amplifying circuit for outputting the above signal is provided.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figure 1 is a schematic configuration diagram of the engagement Rousset Kyuriti processing apparatus a to the embodiment.
[0010]
Security processor a, for example, predetermined processing by using a medium for storing information such as a magnetic card or an IC card (not shown), for example, a predetermined article using the amount data stored in the medium During the output of the adjustment signal from the data processing circuit 1 incorporated in the processing apparatus for paying the purchase price to the measuring terminal 2 exposed to the outside, for adjustment based on the signal given from the outside A means for controlling whether or not to output a signal is added.
[0011]
The data processing circuit 1 is composed of, for example, an arithmetic processing circuit such as a CPU , and processes the processing operation contents without being known to a third party, that is, a security process is performed.
[0012]
Measuring the Teitanshi 2, the security processor adjustment during production adjustment and the maintenance time of a (hereinafter, adjusted as including maintenance) for an oscilloscope or the like capable of detecting the output state of the measuring terminal The measuring instrument (not shown) can be connected.
[0013]
In the figure, 3 is a switch circuit provided between the data processing circuit 1 and the measurement terminal 2, except when adjusting the data processing circuit 1, and operates as shown by the solid line, from the data processing circuit 1 The output pseudo signal is configured to be output to the measurement terminal 2.
[0014]
The switch circuit 3 has an adjustment terminal b connected to an input terminal 4 that is exposed to the outside from the security processing device when the data processing circuit 1 is adjusted. When a switching signal is input, the output signal from the CPU 5 that processes the input signal operates as indicated by the chain line, and the adjustment signal can be output from the data processing circuit 1 to the measurement terminal 2. Has been.
[0015]
As described above, an adjustment signal necessary for adjusting the data processing circuit 1 is not output to the measurement terminal 2 unless a switch switching signal is input to the input terminal 4. be connected, since only the pseudo signal is outputted, it is impossible to estimate the process operation content of the data processing circuit 1, it is possible to enhance the security of the data processing circuit 1.
[0016]
Further, when the signal input to the input terminal 4 is an encryption signal, the security effect can be further enhanced. Further, if the CPU 5 outputs the switch switching signal only when the special program data for switching is supplied from the input terminal 4, the security effect can be further enhanced.
[0017]
Figure 2 shows the other embodiment of the present invention. This security processing device a is configured by providing a modulation circuit 6 instead of the switch circuit 3 of FIG.
[0018]
Modulation circuit 6, if there is no signal from the CPU 5, namely, when the modulation stop signal to the input terminal 4 is not input, you output modulates the adjustment signal from the data processing circuit 1 to the measurement terminal 2.
[0019]
Accordingly, in a state where the modulation stop signal to the input terminal 4 is not input, the adjustment signal modulated to the measurement terminal 2 is output, estimates of the processing operation contents of the data processing circuit 1 becomes difficult to keep the security be able to.
[0020]
FIG. 3 shows still another embodiment. This security processing device a is configured by providing a variable gain type amplification circuit (PGA) 7 instead of the modulation circuit of FIG.
[0021]
When there is no signal from the CPU 5, that is, when no signal is input to the input terminal 4, the PGA 7 is connected to the measurement terminal 2 in a state where security estimation is not possible, such as when the adjustment signal from the data processing circuit 1 is saturated. I am trying to output.
[0022]
Accordingly, in a state where no signal is input to the input terminal 4, a signal that cannot be security-estimated is output to the measurement terminal 2, so that it is difficult to estimate the processing operation contents of the data processing circuit 1, and security can be maintained. .
[0023]
【The invention's effect】
According to the first aspect of the present invention, in the security processing apparatus in which the measurement terminal that outputs a signal for adjusting the data processing circuit subjected to the security processing is exposed to the outside, the predetermined switch is externally provided. Since a switch circuit is provided for outputting a signal for adjusting the data processing circuit to the measurement terminal when a switching encryption signal or switch switching program data is input, a measurement device is simply connected to the measurement terminal. However, since security estimation cannot be performed, the security effect can be enhanced.
According to the second aspect of the present invention, in the security processing apparatus provided with a measurement terminal that outputs a signal for adjusting the data processing circuit subjected to the security processing exposed outside , usually, the measurement terminal When a predetermined modulation stop encryption signal is input from the outside, the modulation processing of the output to the measurement terminal is stopped and a signal for adjusting the data processing circuit is output. Since the modulation circuit is provided, security estimation cannot be performed simply by connecting a measurement device to the measurement terminal, so that the security effect can be enhanced.
According to the third aspect of the present invention, in the security processing apparatus provided with a measurement terminal that outputs a signal for adjusting the data processing circuit subjected to the security processing exposed outside , usually, the measurement terminal To adjust the data processing circuit by changing the gain of the amplification process output to the measurement terminal when a predetermined gain conversion encryption signal is input from the outside without changing the gain of the amplification process output to Therefore, even if a measuring device is simply connected to the measurement terminal, security estimation cannot be performed and the security effect can be enhanced.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a security processing apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a security processing apparatus according to another embodiment of the present invention.
FIG. 3 is a schematic diagram of a security processing apparatus according to still another embodiment of the present invention.
[Explanation of symbols]
a security processing device b adjustment terminal b 'oscilloscope 1 data processing circuit 2 measurement terminal 3 switch circuit 4 input terminal 5 CPU
6 Modulation circuit 7 PGA

Claims (3)

In a security processing apparatus provided with a measurement terminal that outputs a signal for adjusting a data processing circuit subjected to security processing so as not to know what means is being processed ,
A security process comprising a switch circuit that outputs a signal for adjusting the data processing circuit to the measurement terminal when a predetermined switch switching encryption signal or switch switching program data is input from the outside. apparatus. In a security processing apparatus provided with a measurement terminal that outputs a signal for adjusting a data processing circuit subjected to security processing so as not to know what means is being processed ,
Usually, modulation processing of output to the measurement terminal is performed, and when a predetermined modulation stop encryption signal is input from the outside, modulation processing of output to the measurement terminal is stopped and the data processing circuit is adjusted. A security processing device comprising a modulation circuit for outputting a signal for the purpose. In a security processing apparatus provided with a measurement terminal that outputs a signal for adjusting a data processing circuit subjected to security processing so as not to know what means is being processed ,
Normally, the data processing is performed by changing the gain of the amplification process output to the measurement terminal when a predetermined gain conversion encryption signal is input from the outside without changing the gain of the amplification process output to the measurement terminal. A security processing apparatus comprising an amplifier circuit that outputs a signal for adjusting a circuit.

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