AU598272B2 - Electronic memory guard - Google Patents

Electronic memory guard Download PDF

Info

Publication number
AU598272B2
AU598272B2 AU74241/87A AU7424187A AU598272B2 AU 598272 B2 AU598272 B2 AU 598272B2 AU 74241/87 A AU74241/87 A AU 74241/87A AU 7424187 A AU7424187 A AU 7424187A AU 598272 B2 AU598272 B2 AU 598272B2
Authority
AU
Australia
Prior art keywords
guard
memory
electronic
electronic memory
conductor track
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
AU74241/87A
Other versions
AU7424187A (en
Inventor
Masahiko Dohi
James Gallagher
Takashi Nakabayashi
Hiroyuki Shimoyamada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Services Ltd
Original Assignee
Standard Telephone and Cables Pty Ltd
Standard Telephone and Cables PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables Pty Ltd, Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables Pty Ltd
Priority to AU74241/87A priority Critical patent/AU598272B2/en
Publication of AU7424187A publication Critical patent/AU7424187A/en
Application granted granted Critical
Publication of AU598272B2 publication Critical patent/AU598272B2/en
Assigned to ALCATEL AUSTRALIA LIMITED reassignment ALCATEL AUSTRALIA LIMITED Request to Amend Deed and Register Assignors: STANDARD TELEPHONES AND CABLES PTY. LIMITED
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires
    • G08B13/126—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a housing, e.g. a box, a safe, or a room
    • G08B13/128—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a housing, e.g. a box, a safe, or a room the housing being an electronic circuit unit, e.g. memory or CPU chip
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
    • G06F21/86—Secure or tamper-resistant housings
    • G06F21/87—Secure or tamper-resistant housings by means of encapsulation, e.g. for integrated circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Security & Cryptography (AREA)
  • Software Systems (AREA)
  • Storage Device Security (AREA)

Description

7,2
ON(%
COMMONWEAL
4 TH OF AUSTRALIA PATENTS ACT 1952-1969 COMPL4TE SPECIFICATION FOR TH8 INVENTION ENTITLED "ELECTRONIC MEMORY GUARD" The following statement is a full description of' this invention, Including the best method of performing it known to us:-~ 1 This invention relates to an arrangement for the prevention of unauthorized access to information stored in electronic stores such as random access memo,.ies.
The invention will be described in relation to a personal identification number (PIN) entry device adapted to be hand held. Such a device may include a RAM containing confidential ir'ormation, to which it is desired to prevent access by unauthorized people.
It may be possible to wind a fine insulated wire around the device so that access to the electronic components cannot be had wit .out breaking one or more of the loops of o wire. The wire may be in series between the storage device and its power supply so that breaking the wire will cause the memory to fail.
However such a winding process is difficult and time cno consuming.
on It is therefore proposed to provide a flexible printed circuit shaped to enclose at least the components it is desired to protect and having on one side thereof a continuous S conductor track. The flexible circuit is adapted to be Sfolded around the device to be prouected. The conductor 0 0 track substantially encloses the device when the flexible circuit is folded round the device.
The specification discloses an electronic memory protection guard to inhibit access to data stored in an electronic memory of a device, the guard comprising a flexible printed circuit adapted to enclose the device or the part of the device including the memory, the printed circuit having a thin continuous conductor track thereon covering substantially the whole of one side of the printed circuit and with 2 Ueciar ant TO: The Commissioner of Patents, narrow spaces between proximate sections of the conductor track, there being a first termintion point at one end or the conductor track and a second termination point at the other end or the conductor track.
The device and flexible circuit may be encapsulated, ror example in epoxy.
The conductor track is included in the power supply path for a volatile memory e.g. in series between a battery terminal and the power supply terminal of th!e memory.
0, 00 The pattern, thickness and spacing of cGhe track may be varied to further hinder tampeving. The track is so de- 0. 0 0 signed as to make access to the components e.g. by drilling 0000 00"b through the epoxy very difficult because of the risk of in- C, terrupting the power supply.
On the other side of the flexible circuit there may be 00 0Gaaa further printed pattern or even a complete conducting sur'- 0 0 0 face. This makes examination of the protection by X-ray virtually impossible.
00'.
An embodiment of the invention is shown in the drawings 0 0 in which: 0 0 Fig. 1 shows a flexible circuit before folding, and Fig. 2 shows how the circuit would be folded.
In the drawings there is illustrated a flexible circuit adapted to be folded into a box shape. The principle may be readily adapted to more com~plex shapes. The oircvit comprises areas corresponding to the six sides of a box (1 to 6) and printed on these areas is a conductor track 9 which is oontinuous and clo~sely spaced over substantially the whole of the flexible circuit which will form the box. The track 9 runs between terminals 7 and 8 which -,ay be located :ri ;1 I a where desired. Terminals 7 and 8 are adapted to be connected in a power supply circuit for a volatile memory.
As seen in Fig. 2 the areas 1 to 6 can be folded to enclose a device This arrangement has advantages over the wound wire arrangement as it's much cheaper and simpler to apply to the device.
In an alternative circuit the protection guard could for part of a trigger circuit which, when the conductor path is broken, cause the data to be actively erased.
0C 00 C 0 00 00r O 0q; 0 0 00 0 090 0 00 00 0 o0 00 0 0e

Claims (1)

  1. 2. A protection guard as claimed in claim 1, wherein the conductor track is on a first side of the printed cir- cuit and the second side of the printed circuit contains a further conductive pattern or a conductive layer. 1 3. An electronic memory protection guard as herein de- scribed with reference to the accompanying drawings. 4I. An electronic device having a protection guard as Iclaimed in claim 1, claim 2 or claim 3, wherein the guard is 4 In series with a volatile electronic memory power input and the power supply Vor the volatile electronic memory. An electronic device Including an electronic data 3 store or memory and having a protection guard as claimed :Ln any one of claims 1 to 3, wherein the protectton guard is arranged to trigger an erase circuit to erase the data In the store or memory when the conductor track is interrupted. DATED THIS THI-RTEENTH~ DAY OF SEPTEMBER, 1989 STANDARD TELEPHONES AND CABLES PTY. LIMITED
AU74241/87A 1986-06-27 1987-06-15 Electronic memory guard Ceased AU598272B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU74241/87A AU598272B2 (en) 1986-06-27 1987-06-15 Electronic memory guard

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AUPH6613 1986-06-27
AUPH661386 1986-06-27
AU74241/87A AU598272B2 (en) 1986-06-27 1987-06-15 Electronic memory guard

Publications (2)

Publication Number Publication Date
AU7424187A AU7424187A (en) 1988-01-07
AU598272B2 true AU598272B2 (en) 1990-06-21

Family

ID=25637580

Family Applications (1)

Application Number Title Priority Date Filing Date
AU74241/87A Ceased AU598272B2 (en) 1986-06-27 1987-06-15 Electronic memory guard

Country Status (1)

Country Link
AU (1) AU598272B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU621376B2 (en) * 1988-06-17 1992-03-12 W.L. Gore & Associates, Inc. Security enclosures
GB2292709A (en) * 1994-08-31 1996-03-06 Gore & Ass Encapsulation method
AU670324B2 (en) * 1992-09-22 1996-07-11 W.L. Gore & Associates (Uk) Limited Improvements in security enclosure manufacture
BE1019831A3 (en) * 2011-02-18 2013-01-08 Sioen Ind COVER WITH SECURITY.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITFI20060077A1 (en) 2006-03-23 2007-09-24 Gilbarco S P A DEVICE FOR VERIFYING THE REGULARITY OF THE OPERATION OF AUTOMATIC PAYMENT TERMINALS

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU621376B2 (en) * 1988-06-17 1992-03-12 W.L. Gore & Associates, Inc. Security enclosures
AU670324B2 (en) * 1992-09-22 1996-07-11 W.L. Gore & Associates (Uk) Limited Improvements in security enclosure manufacture
GB2292709A (en) * 1994-08-31 1996-03-06 Gore & Ass Encapsulation method
WO1996006717A1 (en) * 1994-08-31 1996-03-07 W. L. Gore & Associates (Uk) Limited Encapsulation method
GB2292709B (en) * 1994-08-31 1997-09-10 Gore & Ass Encapsulation method
BE1019831A3 (en) * 2011-02-18 2013-01-08 Sioen Ind COVER WITH SECURITY.
EP2489561A3 (en) * 2011-02-18 2013-04-03 Sioen Industries NV Elastic tarpaulin with tamper detection

Also Published As

Publication number Publication date
AU7424187A (en) 1988-01-07

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Legal Events

Date Code Title Description
MK14 Patent ceased section 143(a) (annual fees not paid) or expired