JP2013003979A - Information processing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent signals of electronic components on a printed circuit board (PCB) from being analyzed if the apparatus body is opened and the PCB inside it is exposed.SOLUTION: An information processing apparatus includes an apparatus body, first and second circuit boards that are disposed so as to be separated from and opposed to each other in the apparatus body, electronic components provided respectively on opposing faces of the first and second circuit boards, and shield members surrounding the peripheries of the first and second circuit boards.

Description

  Embodiments of the present invention relate to an information processing apparatus applied as, for example, a payment device and a PIN-PAD for payment.

  This type of information processing apparatus performs settlement processing by reading information from, for example, a credit card or a quiche card.

  This information processing apparatus includes a tamper detection mechanism for detecting an attack (hereinafter referred to as tamper) from a hacker who performs an illegal act of illegally acquiring card information or the like by disassembling the apparatus main body.

  As this tamper detection mechanism, a mechanical tamper switch (tamper SW) that detects opening and closing of the main body of the information processing apparatus is known. When the hacker opens the apparatus main body, the tamper SW unit is cut off and the tamper is detected.

  Usually, a protrusion is provided on the apparatus main body side, and a conductive pattern portion on a printed circuit board (hereinafter referred to as PCB) is pressed and brought into contact with the protrusion. When the hacker opens the apparatus main body, the contact between the conductive pattern portion and the protruding portion is released, the conductive pattern portion is brought into a non-conductive state, and the tamper is detected.

  However, conventionally, when the apparatus main body is opened, the PCB in the apparatus main body is exposed, and there is a possibility that a signal is analyzed by applying a probe or the like to an electronic component on the PCB.

JP 2003-337753 A

  The problem to be solved is to provide an information processing apparatus in which signals of electronic components on a PCB are not analyzed even when the apparatus main body is opened and an internal PCB is exposed.

  In order to solve the above-described problems, an embodiment includes an apparatus main body, first and second circuit boards disposed in a state of being opposed to each other in the apparatus main body, and opposing surfaces of the first and second circuit boards. Each of the electronic components, and a shielding member surrounding the outer periphery of the first and second circuit boards.

1 is a side sectional view showing a payment terminal device according to a first embodiment. The perspective view which shows the main board | substrate and sub board | substrate provided in the payment terminal device of FIG. The block diagram which shows the control circuit of the payment terminal device of FIG. The perspective view which shows the shielding board surrounding the outer peripheral part of the main board | substrate of FIG. 2, and a sub board | substrate. The top view which shows the shielding board of FIG. The front view which shows the signal line arrange | positioned at the inner surface side of the shielding board of FIG. The front view which shows the signal line arrange | positioned at the inner surface side of the shielding board of FIG. FIG. 3 is an exploded perspective view illustrating a main board, a sub board, and a shielding plate in FIG. 2. The perspective view which shows the arrangement structure of the signal line which is 2nd Embodiment. The front view which shows the arrangement structure of the signal line of FIG.

  Hereinafter, embodiments will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a side sectional view showing a payment terminal apparatus as an information processing apparatus according to the first embodiment.

  In FIG. 1, reference numeral 1 denotes an apparatus main body, and the apparatus main body 1 includes a bottom plate 1a and a casing 1b provided on the bottom plate 1a so as to be opened and closed. As shown in FIG. 2, a main board 2 as a first circuit board and a sub board 3 as a second circuit board are disposed in the case main body 1 so as to face each other.

  FIG. 3 is a block diagram showing a control circuit of the settlement terminal device.

  A CPU 4 is provided on the lower surface side of the main board 2, and a keyboard 5 and a display 6 are connected to the CPU 4 via bus lines and various control circuits. The CPU 4 is connected to a ROM 8, a RAM 9, and a driver 10 through a bus line. An IC card connector 13 is connected to the CPU 4 via an IC card controller 12. Further, an open detection circuit 14 for detecting the opening of the casing 1b is connected to the CPU 4.

  On the other hand, a detection circuit 19 as tamper detection means for detecting disconnection of the connector 16, the battery 17 and a detection line 25 described later is disposed on the upper surface side of the sub-board 3. The connector 16 is connected to the driver 10 described above, the battery 17 is connected to the open detection circuit 14 described above, the IC card controller 12 described above, and the detection circuit 19 is connected to the CPU 4 described above via the connector 21. .

  As shown in FIG. 2, the main board 2 described above has at least a security area 22, and the CPU 4, ROM 8, S-RAM 9, IC card controller 12, and open detection circuit 14 are included in the security area 22. An electronic unit composed of (a group of components surrounded by a broken line in FIG. 3) is mounted.

  By the way, as shown in FIGS. 4 and 5, four shielding plates 24a and 24b as shielding members are arranged on the outer peripheral four surfaces of the main substrate 2 and the sub substrate 3, and these four shielding plates. The internal space constituted by 24a, 24b, the main board 2 and the sub board 3 has a structure shielded from the outside.

  Therefore, the electronic components such as the CPU 4 and the memory (S-RAM) 9 disposed on the lower surface side of the main board 2 and the signal lines thereof are disposed in the internal space shielded from the outside. .

  Thereby, even if the casing 1b of the apparatus body 1 is opened, the signal line is not exposed to the outside, and the hacker touches the electronic component from the gap between the main board 2 and the sub board 3 and the encryption key. Even if the user's personal identification number is stolen, it is blocked by the shielding plates 24a and 24b, and the analysis of the signal transmitted between the electronic components is reliably prevented.

  Further, as shown in FIGS. 6 and 7, for example, a detection line for detecting tampering in a state of meandering downward from the upper side of the four shielding plates 24a and 24b described above. 25 is arranged. The detection line 25 may be arranged in a state of meandering in the left-right direction, that is, in a state of meandering from the left side to the right side.

  On the other hand, signal lines through which encryption key information and the like pass are arranged in the inner layer portions of the main board 2 and the sub board 3, and mesh tamper detection signal lines (not shown) are provided on the outer layer side to protect them from tampering. Has been placed. The CPU 4 is connected to the tamper detection signal line via the detection circuit 19. The tamper detection signal lines of the main board 2 and the sub board 3 are connected via the detection line 25 as shown in FIG.

  For example, the detection line 25 allows a part of the tamper detection signal line of the main board 2 to be led out from the main board 2, and the tamper detection signal line thus derived is wired along the inner surfaces of the shielding plates 24a and 24b. It is constituted by doing. A part of the tamper detection signal line led out from the main board 2 is connected to the tamper detection signal line of the sub board 3.

  The detection line 25 leads a part of the tamper detection signal line of the sub-board 3 to the outside from the sub-board 3 and routes the derived tamper detection signal line along the inner surfaces of the shielding plates 24a and 24b. You may make it comprise by this. A part of the tamper detection signal line led out from the sub-board 3 is connected to the tamper detection signal line of the main board 2.

  When a hole is made in the shielding plates 24a and 24b by a hacker using a drill or the like, the detection line 25 is short-circuited or disconnected, and the tampering is detected by the detection circuit 19. When this detection is made, the CPU 4 stops the power supply from the battery 17 and erases the data stored in the memory (S-RAM) 9 to prevent fraud.

  As the detection line 25, the tamper detection signal line is not diverted, but the signal line of the open detection circuit 14 for detecting the opening of the apparatus main body 1 may be diverted, or a part of the power line, For example, the power supply line to the tamper detection system line may be diverted, the power line to the apparatus itself may be diverted, or the reader / writer signal response (ACK) signal line to the memory 9 may be diverted. You may do.

(Second Embodiment)
FIG. 9 shows an arrangement configuration of the detection lines 31 according to the second embodiment.

  In the first embodiment described above, one end side of the detection line 25 of the shielding plates 24a and 24b is connected to the main board 2 and the other end side is connected to the sub board 3 one by one. In the embodiment, the detection lines 31 of the shielding plates 24a and 24b repeatedly go back and forth between the main board 2 and the sub board 3 via the main board 2 and the sub board 3 as shown in FIG. Are arranged as follows.

  That is, in the second embodiment, the detection lines 31 of the shielding plates 24 a and 24 b are connected to the main board 2 and the sub board 3 at a plurality of locations.

  Therefore, according to the second embodiment, it is difficult for a hacker to remove or destroy the shielding plates 24a and 24b, and there is an advantage that the tamper can be detected more easily.

  In addition, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Apparatus main body, 2 ... 1st circuit board, 3 ... 2nd circuit board, 4 ... CPU (electronic component), 14 ... Open detection circuit (detection part), 19 ... Detection circuit (tamper detection means) 24
a ... shielding plate (shielding member), 24b ... shielding plate (shielding member), 25, 31 ... detection line.

Claims (6)

The device body;
A first circuit board and a second circuit board disposed in a state of being opposed to each other in the apparatus main body;
Electronic components respectively disposed on opposing surfaces of the first and second circuit boards;
An information processing apparatus comprising: a shielding member that surrounds outer peripheral portions of the first and second circuit boards. A detection line provided on the inner surface side of the shielding member;
2. The information processing apparatus according to claim 1, further comprising tamper detection means for detecting a tamper based on damage to the detection line. 3. The information processing apparatus according to claim 2, wherein a tamper detection signal line disposed on the first and second circuit boards is used as the detection line.   The information processing apparatus according to claim 2, wherein the detection line uses a power supply line to the apparatus main body. The apparatus body is configured to be openable and closable, and includes a detection unit that detects the opening and closing of the apparatus body.
The information processing apparatus according to claim 2, wherein the detection line is a signal line of the detection unit.   6. The information processing apparatus according to claim 2, wherein the detection line reciprocates between the first and second circuit boards a plurality of times and is connected at a plurality of locations. 6.

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