JP2009181217A - Tampering resist structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tampering resist structure with excellent tampering resist performance that is post-applied to an existing unit to be protected. <P>SOLUTION: An FPC 10 includes an inside wiring pattern 21 formed so as to be extended along almost the whole surface of an inside face 11 and an outside wiring pattern 22 formed so as to be extended along the whole surface of an outside face 12. The inside wiring pattern 21 at the other edge 10b side of the FPC 10 is connected to the outside wiring pattern 22 at the one end 10a side of the FPC 10 when the other end 10b of the FPC 10 is overlapped with a reinforcement board 40a bonded to one end 10a side of the FPC 10. A tampering act is detected on the basis of the respective and mutual disconnection or short circuit of the inside wiring pattern 21 and the outside wiring pattern 22. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a tamper resistant structure for protecting a unit to be protected from tampering action.

  If it is designed to have tamper resistance in the design stage of an electronic device having a unit to be protected from tampering, various means can be adopted, but in the case of an existing unit, it should be protected. It is necessary to retrofit a tamper-resistant structure that covers the unit.

  Conventionally, this type of tamper-resistant structure includes the following.

  A wiring pattern for detecting a disconnection or a short circuit is formed, and the unit is covered with a plurality of PCBs (Printed Circuit Boards) corresponding to each surface of the unit to be protected, which has a polyhedral shape.

  The unit is covered with FPC (Flexible Printed Circuits) in which a wiring pattern for detecting disconnection or short circuit is formed. Such a tamper-resistant structure is disclosed in, for example, Patent Documents 1 to 3.

JP 2002-229857 A JP 2004-086325 A Japanese Patent Publication No. 07-082459

  However, in the tamper-resistant structure having a plurality of PCBs, there is always a gap between the plurality of PCBs even if the unit to be protected is surrounded. Therefore, there is a possibility that a tampering action is performed using the gap.

  In addition, the tamper-resistant structure having FPC has a flexible FPC, so that a gap is easily formed, and there is a possibility that a tampering action may be performed using the gap.

  Therefore, an object of the present invention is to provide a tamper-resistant structure that can be applied later to an existing unit to be protected and has excellent tamper-resistant performance.

  Another object of the present invention is to provide an electronic device having such a tamper resistant structure.

  According to the present invention, there is a tamper-resistant structure for protecting a unit to be protected from tampering action, which extends from one end to the other end so that the inner surface is tightly wound around the outer peripheral surface of the unit to be protected. The FPC includes an inner wiring pattern formed so as to extend over substantially the entire inner surface, and an outer wiring pattern formed so as to extend over substantially the entire outer surface; A plurality of reinforcing plates that are arranged and bonded along the other end from the one end of the FPC over substantially the entire outer surface of the FPC, and the inner surface on the other end side of the FPC is the FPC When the wire is wound around a unit to be protected, the FPC is in close contact with and overlapped with the reinforcing plate bonded to the outer surface on the one end side, and the inner wiring on the other end side of the FPC. The pattern is When the other end of the FPC overlaps the reinforcing plate bonded to the one end side of the FPC, the FPC is connected to the outer wiring pattern on the one end side of the FPC. A tamper-resistant structure can be obtained in which a tampering action is detected based on each of the wiring pattern and the outer wiring pattern, as well as a mutual disconnection or short circuit.

  The reinforcing plate bonded to the one end side of the FPC has a hole portion that exposes the outer wiring pattern, and is inserted into the hole portion, and the other end of the FPC is connected to the FPC. An anisotropy that connects the inner wiring pattern on the other end side of the FPC to the outer wiring pattern on the one end side of the FPC when overlapping the reinforcing plate bonded to the one end side of the FPC. There may be further provided a connecting member made of conductive rubber, and the tampering action may be detected based on each of the inner wiring pattern, the outer wiring pattern, and the connecting member, and a mutual disconnection or short circuit.

  Further, the hole portion may function as a holder for holding the connection member.

  Further, it further includes a detection circuit that is disposed in a space inside the outer peripheral surface of the unit to be protected and detects a tampering action based on each of the inner wiring pattern and the outer wiring pattern and mutual disconnection or short circuit. It may be.

  A first connector connected to the detection circuit; and a second connector mounted on the inner surface of the FPC corresponding to the first connector and connected to the inner wiring pattern. The second connector is connected to the first connector when the FPC is wound around a unit to be protected, and the detection circuit includes the inner wiring pattern and the outer wiring. The tampering action may be detected based on the pattern, each of the first connector, and the second connector, and a disconnection or a short circuit between each other.

  According to the present invention, there is also obtained an electronic device comprising the tamper resistant structure and the unit to be protected.

  The tamper-resistant structure according to the present invention can be applied not only to an existing unit to be protected, but also has excellent tamper-resistant performance.

  More specifically, it is possible to cover a unit to be protected, which has various shapes such as a rectangular parallelepiped and a cube, without any unauthorized access. Further, it can be detected that the fixing means such as a screw for fixing the overlap of the FPC end is loosened.

  Furthermore, since the connection part where the wiring pattern of this structure is connected to the control part is also connected inside the protective plate, unauthorized access is impossible.

  Hereinafter, an embodiment of a tamper-resistant structure according to the present invention will be described with reference to the drawings.

  Referring to FIGS. 1 (a) and (b), FIG. 2, and FIG. 3, the tamper resistant structure according to the present invention protects the unit 100 to be protected from tampering.

  The tamper-resistant structure has an FPC 10 that extends from one end 10 a to the other end 10 b so that the inner surface 11 is tightly wound around the outer peripheral surface of the unit 100.

  The FPC 10 includes an inner wiring pattern 21 formed so as to extend over substantially the entire inner surface 11 and an outer wiring pattern 22 formed so as to extend over substantially the entire outer surface 12.

  Further, the tamper-resistant structure includes a plurality of (in this example, five) reinforcing plates 40 a to 40 that are aligned and bonded along the other end 10 b from one end 10 a of the FPC 10 over substantially the entire outer surface 12 of the FPC 10. 40e.

  When the FPC 10 is wound around the unit 100, the inner side surface 11 on the other end 10b side of the FPC 10 closely contacts and overlaps the outer side surface of the reinforcing plate 40a bonded to the outer side surface 12 on the one end 10a side of the FPC 10.

  Further, the inner wiring pattern 21 on the other end 10b side of the FPC 10 has an outer wiring pattern 22 on the one end 10a side of the FPC 10 when the other end 10b of the FPC 10 overlaps the reinforcing plate 40a bonded to the one end 10a side of the FPC 10. To be connected to.

  And this tamper-resistant structure detects a tampering action based on each of the inner wiring pattern 21 and the outer wiring pattern 22 and mutual disconnection or short circuit.

  A hole 401a for exposing the outer wiring pattern 22 is formed in the reinforcing plate 40a bonded to the one end 10a side of the FPC 10. The tamper-resistant structure is inserted and arranged in the hole 401a. When the other end 10b of the FPC 10 overlaps the reinforcing plate 40a bonded to the one end 10a side of the FPC 10, the inner side of the FPC 10 on the other end 10b side. It further has a connection member 50 made of anisotropic conductive rubber for connecting the wiring pattern 21 to the outer wiring pattern 22 on the one end 10 a side of the FPC 10. The tamper resistant structure detects the tampering action based on each of the inner wiring pattern 21, the outer wiring pattern 22, and the connection member 50, and a mutual disconnection or short circuit. The hole 401a functions as a holder for holding the connection member 50.

  Further, the tamper-resistant structure is disposed in a space inside the outer peripheral surface of the unit 100, and detects tampering based on individual and mutual disconnection or short circuit of the inner wiring pattern 21 and the outer wiring pattern 22. A circuit board 60 is further included.

  The tamper-resistant structure is mounted on the detection circuit board 60 and connected to the detection circuit of the detection circuit board 60, and the inner surface 11 of the FPC 10 corresponds to the first connector 70. And a second connector 80 mounted and connected to the inner wiring pattern 21. The second connector 80 is connected to the first connector 70 when the FPC 10 is wound around the unit 100. Then, the detection circuit board 60 (the detection circuit thereof) performs tampering action based on individual and mutual disconnection or short circuit of the inner wiring pattern 21, the outer wiring pattern 22, the first connector 70, and the second connector 80. To detect.

  The combination of the tamper resistant structure and the unit 100 to be protected can be said to be an electronic device having a tamper resistant structure.

  Hereinafter, embodiments of a tamper-resistant structure according to the present invention will be described with reference to the drawings.

  Referring to FIGS. 1A and 1B, FIG. 2 and FIG. 3, the tamper-resistant structure of this embodiment protects a unit 100 having a rectangular parallelepiped shape such as a card reader that should be protected from tampering. To do. Note that the unit to be protected is not necessarily a rectangular parallelepiped. This tamper-resistant structure is suitable for a unit in which an opening that may receive unauthorized access exists only in one outer peripheral surface.

  The tamper-resistant structure has an FPC 10 that extends from one end 10 a to the other end 10 b so that the inner surface 11 is tightly wound around the outer peripheral surface of the unit 100. The FPC 10 is seamless.

  The FPC 10 has an inner wiring pattern 21 formed so as to extend (substantially) over substantially the entire inner surface 11 and an outer wiring pattern formed so as to extend (substantially) over the entire entire outer surface 12. 22 is included. Note that the FPC 10 may further include an inner layer, and the inner layer may also have a wiring pattern formed so as to extend substantially throughout the layer.

  Further, the tamper-resistant structure includes a plurality of (in this example, five) reinforcing plates 40 a to 40 that are aligned and bonded along the other end 10 b from one end 10 a of the FPC 10 over substantially the entire outer surface 12 of the FPC 10. 40e. The material of the reinforcing plates 40a to 40e is glass epoxy, other resin, or metal.

  When the FPC 10 is wound around the unit 100, the inner side surface 11 on the other end 10b side of the FPC 10 closely contacts and overlaps the outer side surface of the reinforcing plate 40a bonded to the outer side surface 12 on the one end 10a side of the FPC 10.

  Further, the inner wiring pattern 21 on the other end 10b side of the FPC 10 has an outer wiring pattern 22 on the one end 10a side of the FPC 10 when the other end 10b of the FPC 10 overlaps the reinforcing plate 40a bonded to the one end 10a side of the FPC 10. To be connected to.

  Specifically, an inner pad 211 connected to the inner wiring pattern 21 is formed at a predetermined location on the inner side surface 11 of the FPC 10. On the other hand, on the outer surface 12 of the FPC 10, outer pads 221 connected to the outer wiring pattern 22 corresponding to the inner pads 211 are formed.

  In addition, a hole 401 a that exposes the outer pad 221 connected to the outer wiring pattern 22 is formed in the reinforcing plate 40 a bonded to the one end 10 a side of the FPC 10. The tamper-resistant structure is inserted and arranged in the hole 401a. When the other end 10b of the FPC 10 overlaps the reinforcing plate 40a bonded to the one end 10a side of the FPC 10, the inner side of the FPC 10 on the other end 10b side. It further has a connecting member 50 made of anisotropic conductive rubber for connecting the inner pad 211 connected to the wiring pattern 21 to the outer wiring pattern 22 on the one end 10 a side of the FPC 10. The hole 401 a functions as a holder that holds the connection member 50. The hole 401a is formed in the reinforcing plate 40a in advance before being bonded to the FPC 10.

  The connecting member 50 is slightly thicker than the reinforcing plate 40a, and is sandwiched between the outer side surface 12 and the inner side surface 11 of the FPC 10 in a state in which the periphery is restricted by the hole 401a as a holder. Thus, the outer pad 221 and the inner pad 211 are securely connected. Referring to FIG. 3 and FIG. 4, the connection pad comes to the hole 401 a formed in the reinforcing plate 40 a. Since the diameters and pitches of the plurality of conductors 52 of the connection member 50 are as small as several tens of microns, if the connection pads 211 and 221 are formed to be about 1 mm square, contact is possible at several contact points.

  Further, the tamper-resistant structure is disposed in a space inside the outer peripheral surface of the unit 100, and detects tampering based on individual and mutual disconnection or short circuit of the inner wiring pattern 21 and the outer wiring pattern 22. A circuit board 60 is further included. In addition to the tampering detection function, the detection circuit board 60 may have a communication function with the unit 100 and higher-order components.

  The tamper-resistant structure is mounted on the control board, and is mounted on the inner surface 11 of the FPC 10 corresponding to the first connector 70 connected to the detection circuit of the detection circuit board 60. And a second connector 80 connected to the inner wiring pattern 21. The second connector 80 is connected to the first connector 70 when the FPC 10 is wound around the unit 100.

  The detection circuit of the detection circuit board 60 is tampered based on individual and mutual disconnection or short circuit of the inner wiring pattern 21, the outer wiring pattern 22, the connection member 50, the first connector 70, and the second connector 80. Detect actions. The detection circuit board 60 also includes a control circuit that stores a program so that the tampering detection function becomes effective when the tamper resistant structure is mounted and fixed on the unit 100.

  After screwing as shown in FIG. 3 (the set screw is shown only in FIG. 3), the gap between the unit and the FPC 10 and the gap between the inner surface 11 on the other end 10b side of the FPC 10 and the reinforcing plate 40a. Unauthorized access such as inserting a conductor from the outside is impossible. Further, when the screw is loosened, the connection between the inner wiring pattern 21 and the outer wiring pattern 22 through the connection member 50 is interrupted, so that a tampering action is detected. Even if a hole or a notch is made in the FPC 10 with a drill or the like, the outer wiring pattern 22 and the inner wiring pattern 21 are disconnected or short-circuited, so that a tampering action is detected. The FPC 10 is exposed at the portion corresponding to the ridgeline of the unit 100, that is, between the two reinforcing plates. However, the outer wiring pattern 22 and the inner wiring pattern 21 may be cut or perforated. Is disconnected or short-circuited, so tampering is detected. Furthermore, since the first connector 70 and the second connector 80 cannot be removed unless the winding of the FPC 10 is released, external access is not possible.

  Next, examples of wiring patterns and detection circuits will be described with reference to FIG. 5 and FIGS. 6 (a) and 6 (b).

  Inner wiring patterns 21A, 21B, 21A ′, and 21B ′ are formed as inner wiring patterns 21 on the inner side surface 11 of the FPC 10. Outer wiring patterns 22 </ b> A and 22 </ b> B are formed as outer wiring patterns 22 on the outer surface 12 of the FPC 10.

  The inner wiring pattern 21A, the outer wiring pattern 22A, and the inner wiring pattern 21A ′ are connected in series via the inner pad 211, the connection member 50 (not shown), and the outer pad 221, and normally detect LOW output. Signal A is sent. On the other hand, the inner wiring pattern 21B, the outer wiring pattern 22B, and the inner wiring pattern 21B ′ are connected in series via the inner pad 211, the connection member 50 (not shown), and the outer pad 221, and are normally HIGH output. Detection signal B is supplied.

  The detection signals A and B are input to a port, a comparator, an A / D converter, and the like included in the detection circuit of the detection circuit board 60, and voltage and current levels are detected.

  Further, the resistors (R1, R2) related to the detection signal A and the resistors (R3, R4) related to the detection signal B are set to different resistance values, so that the wirings are short-circuited, opened alone, etc. Is detected.

  In this example, there are two types of detection signals and the circuit is simple. However, the protection strength can be further increased by increasing the number of wiring signal components or making the circuit more complicated.

  The present invention is not limited to the embodiments described above, and it goes without saying that various modifications are possible within the technical scope described in the claims.

It is a figure which shows the tamper-resistant structure by this invention, (a) is a perspective view, (b) is a side view. It is a perspective view which shows the tamper-resistant structure by this invention. It is sectional drawing which shows the principal part of the tamper-resistant structure by this invention. It is a partial top view which shows the principal part of the tamper-resistant structure by this invention. It is a circuit diagram of the detection circuit of the tamper-resistant structure according to the present invention. It is a figure which shows the state by which the tamper-resistant structure by this invention was expand | deployed, (a) is a top view which shows an inner surface, (b) is a top view which shows an outer surface.

Explanation of symbols

10 FPC
10a one end 10b other end 21 inner wiring pattern 22 outer wiring patterns 40a to 40e reinforcing plate 50 connecting member 60 detection circuit board 70 first connector 80 second connector 100 unit 211 inner pad 221 outer pad 401a hole

Claims (6)

A tamper-resistant structure that protects a unit that should be protected from tampering,
Having an FPC extending from one end to the other so that the inner surface is closely wound around the outer peripheral surface of the unit to be protected;
The FPC includes an inner wiring pattern formed so as to extend over substantially the entire inner surface, and an outer wiring pattern formed so as to extend over substantially the entire outer surface,
Furthermore, it has a plurality of reinforcing plates that are aligned and bonded along the other end from the one end of the FPC over substantially the entire outer surface of the FPC,
When the FPC is wound around a unit to be protected, the inner side surface on the other end side of the FPC closely overlaps with the reinforcing plate bonded to the outer side surface on the one end side of the FPC. And
The inner wiring pattern on the other end side of the FPC has the outer side on the one end side of the FPC when the other end of the FPC overlaps the reinforcing plate bonded to the one end side of the FPC. It is designed to be connected to the wiring pattern
A tamper-resistant structure, wherein a tampering action is detected based on the inner wiring pattern and the outer wiring pattern individually and on the basis of a mutual disconnection or short circuit. The reinforcing plate bonded to the one end side of the FPC has a hole for exposing the outer wiring pattern,
When the other end of the FPC is inserted and arranged in the hole and overlaps with the reinforcing plate bonded to the one end of the FPC, the inner wiring pattern on the other end of the FPC is A connection member made of anisotropic conductive rubber is further connected to the outer wiring pattern on the one end side of the FPC, and each of the inner wiring pattern, the outer wiring pattern, and the connecting member, and a disconnection or a short circuit between them. 2. The tamper-resistant structure according to claim 1, wherein a tampering action is detected based on the tamper resistance.   The tamper-resistant structure according to claim 2, wherein the hole functions as a holder that holds the connection member.   2. A detection circuit which is disposed in a space inside the outer peripheral surface of the unit to be protected and detects a tampering action based on each of the inner wiring pattern and the outer wiring pattern and mutual disconnection or short circuit. 4. A tamper-resistant structure according to any one of items 1 to 3. A first connector connected to the detection circuit;
A second connector mounted on the inner surface of the FPC corresponding to the first connector and connected to the inner wiring pattern;
The second connector is adapted to be connected to the first connector when the FPC is wound around a unit to be protected.
The said detection circuit detects a tampering action based on each of the said inner side wiring pattern, the said outer side wiring pattern, the said 1st connector, and the said 2nd connector, and a mutual disconnection and short circuit. Tamper-resistant structure.   An electronic apparatus comprising the tamper-resistant structure according to claim 1 and the unit to be protected.

Images