GB1529939A - Method of verification of magnetic records - Google Patents

Method of verification of magnetic records

Info

Publication number
GB1529939A
GB1529939A GB1712278A GB1712278A GB1529939A GB 1529939 A GB1529939 A GB 1529939A GB 1712278 A GB1712278 A GB 1712278A GB 1712278 A GB1712278 A GB 1712278A GB 1529939 A GB1529939 A GB 1529939A
Authority
GB
United Kingdom
Prior art keywords
production signal
oct
aligned
read
pattern
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.)
Expired
Application number
GB1712278A
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.)
EMI Ltd
Original Assignee
EMI Ltd
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 EMI Ltd filed Critical EMI Ltd
Priority to GB1712278A priority Critical patent/GB1529939A/en
Publication of GB1529939A publication Critical patent/GB1529939A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K5/00—Methods or arrangements for verifying the correctness of markings on a record carrier; Column detection devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/08—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means
    • G06K19/10—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards
    • G06K19/12—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards the marking being sensed by magnetic means
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07F—COIN-FREED OR LIKE APPARATUS
    • G07F7/00—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus
    • G07F7/08—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means
    • G07F7/086—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means by passive credit-cards adapted therefor, e.g. constructive particularities to avoid counterfeiting, e.g. by inclusion of a physical or chemical security-layer

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Credit Cards Or The Like (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

1529939 Reading record cards EMI Ltd 6 Oct 1975 [16 Oct 1974] 17122/78 Divided out of 1529937 Heading G5R An object purporting to be a security document comprising a layer with a permanent structure in the form of selected spaced regions within which magnetically anisotropic material is aligned in a distinct direction and other regions wherein the material is unaligned or aligned in another distinct direction, are investigated by a process comprising the steps of reading and storing any information recorded on any such medium and, in order to assess veracity of the object, magnetizing any such layer to above its coercive force value with a unidirectional magnetic field and detecting the resultant magnetic remanence pattern. Initially a magnetic field may be applied to record a production signal of known form into the magnetic medium, any such recorded production signal being read with said information and of comparing the read-out production signal with the known form to detect any anomalies of the form as can be caused by simulation of a permanent alignment remanence pattern by variation in the thickness of the material.
GB1712278A 1975-10-06 1975-10-06 Method of verification of magnetic records Expired GB1529939A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1712278A GB1529939A (en) 1975-10-06 1975-10-06 Method of verification of magnetic records

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1712278A GB1529939A (en) 1975-10-06 1975-10-06 Method of verification of magnetic records

Publications (1)

Publication Number Publication Date
GB1529939A true GB1529939A (en) 1978-10-25

Family

ID=10089673

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1712278A Expired GB1529939A (en) 1975-10-06 1975-10-06 Method of verification of magnetic records

Country Status (1)

Country Link
GB (1) GB1529939A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2535885A1 (en) * 1982-11-08 1984-05-11 Vault Corp METHOD AND APPARATUS FOR READING UNAUTHORIZED COPYING OF RECORDED DATA
FR2536187A1 (en) * 1982-11-17 1984-05-18 Crouzet Sa Anti-fraud reader for magnetic data media.
GB2142765A (en) * 1983-07-04 1985-01-23 John William Hawkins Preventing unauthorised use of recorded information
US4734796A (en) * 1983-04-14 1988-03-29 Amiram Grynberg Technique for preventing unauthorized copying of information recorded on a recording medium and a protected recording medium
US4823210A (en) * 1984-08-13 1989-04-18 Verbatim Corporation Copy protected disk
EP0355162A4 (en) * 1987-04-17 1990-01-29 Kyodo Printing Co Ltd Magnetic recording medium.
GB2316907A (en) * 1996-09-04 1998-03-11 Thorn Secure Science Ltd Magnetic card having superimposed permanently structured layers of anisotropic particles aligned along different axes

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2535885A1 (en) * 1982-11-08 1984-05-11 Vault Corp METHOD AND APPARATUS FOR READING UNAUTHORIZED COPYING OF RECORDED DATA
GB2131580A (en) * 1982-11-08 1984-06-20 Vault Corp Frustrating the unauthorized copying of recorded data
FR2536187A1 (en) * 1982-11-17 1984-05-18 Crouzet Sa Anti-fraud reader for magnetic data media.
US4734796A (en) * 1983-04-14 1988-03-29 Amiram Grynberg Technique for preventing unauthorized copying of information recorded on a recording medium and a protected recording medium
GB2142765A (en) * 1983-07-04 1985-01-23 John William Hawkins Preventing unauthorised use of recorded information
US4823210A (en) * 1984-08-13 1989-04-18 Verbatim Corporation Copy protected disk
EP0355162A4 (en) * 1987-04-17 1990-01-29 Kyodo Printing Co Ltd Magnetic recording medium.
EP0355162A1 (en) * 1987-04-17 1990-02-28 Kyodo Printing Co., Ltd. Magnetic recording medium
US4982076A (en) * 1987-04-17 1991-01-01 Kyodo Printing Co., Ltd. Magnetic recording medium
AU609475B2 (en) * 1987-04-17 1991-05-02 Kyodo Printing Co., Ltd. Magnetic recording medium
GB2316907A (en) * 1996-09-04 1998-03-11 Thorn Secure Science Ltd Magnetic card having superimposed permanently structured layers of anisotropic particles aligned along different axes
GB2316907B (en) * 1996-09-04 2000-09-06 Thorn Secure Science Ltd A data store

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19951005