NO177073C - Fremgangsmåte for identifisering av aktivert tast i en ikke-kodet tastatur-matrise, samt krets for iverksettelse av fremgangsmåten - Google Patents

Fremgangsmåte for identifisering av aktivert tast i en ikke-kodet tastatur-matrise, samt krets for iverksettelse av fremgangsmåten

Info

Publication number
NO177073C
NO177073C NO895116A NO895116A NO177073C NO 177073 C NO177073 C NO 177073C NO 895116 A NO895116 A NO 895116A NO 895116 A NO895116 A NO 895116A NO 177073 C NO177073 C NO 177073C
Authority
NO
Norway
Prior art keywords
circuit
implementing
well
keyboard
outputs
Prior art date
Application number
NO895116A
Other languages
English (en)
Other versions
NO895116L (no
NO895116D0 (no
NO177073B (no
Inventor
Philippe Verrier
Roger Poulenard
Hartmut Fink
Original Assignee
Bull Sa
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 Bull Sa filed Critical Bull Sa
Publication of NO895116D0 publication Critical patent/NO895116D0/no
Publication of NO895116L publication Critical patent/NO895116L/no
Publication of NO177073B publication Critical patent/NO177073B/no
Publication of NO177073C publication Critical patent/NO177073C/no

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M11/00—Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys
    • H03M11/20—Dynamic coding, i.e. by key scanning
    • 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
    • G06F21/82—Protecting input, output or interconnection devices
    • G06F21/83—Protecting input, output or interconnection devices input devices, e.g. keyboards, mice or controllers thereof
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
    • G06F3/023—Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Security & Cryptography (AREA)
  • Software Systems (AREA)
  • Human Computer Interaction (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Storage Device Security (AREA)
  • Communication Control (AREA)
NO895116A 1988-12-20 1989-12-19 Fremgangsmåte for identifisering av aktivert tast i en ikke-kodet tastatur-matrise, samt krets for iverksettelse av fremgangsmåten NO177073C (no)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8816786A FR2641656B1 (fr) 1988-12-20 1988-12-20 Procede de brouillage de l'identification d'une touche d'un clavier non code, et circuit pour la mise en oeuvre du procede

Publications (4)

Publication Number Publication Date
NO895116D0 NO895116D0 (no) 1989-12-19
NO895116L NO895116L (no) 1990-06-21
NO177073B NO177073B (no) 1995-04-03
NO177073C true NO177073C (no) 1995-07-12

Family

ID=9373142

Family Applications (1)

Application Number Title Priority Date Filing Date
NO895116A NO177073C (no) 1988-12-20 1989-12-19 Fremgangsmåte for identifisering av aktivert tast i en ikke-kodet tastatur-matrise, samt krets for iverksettelse av fremgangsmåten

Country Status (7)

Country Link
EP (1) EP0375546B1 (no)
AT (1) ATE97245T1 (no)
DE (1) DE68910657T2 (no)
ES (1) ES2048311T3 (no)
FR (1) FR2641656B1 (no)
HK (1) HK80697A (no)
NO (1) NO177073C (no)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR930005841B1 (ko) * 1990-10-27 1993-06-25 삼성전자 주식회사 마이크로_콤퓨터시스템의 키스캔회로 및 그 방법
FR2692378B1 (fr) * 1992-06-12 1994-07-29 Dassault Automatismes Telecomm Unite a clavier de securite perfectionnee.
GB9224524D0 (en) * 1992-11-24 1993-01-13 Vecta Ltd A security system and a method
US5832206A (en) * 1996-03-25 1998-11-03 Schlumberger Technologies, Inc. Apparatus and method to provide security for a keypad processor of a transaction terminal
GB2333883B (en) * 1998-01-28 2002-10-16 Markus Guenther Kuhn Low cost countermeasure against compromising electromagnetic computer emanations
CN105353889B (zh) * 2015-11-29 2018-07-06 恒宝股份有限公司 一种随机扫描键盘及其扫描方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0128672A1 (en) * 1983-05-13 1984-12-19 Ira Dennis Gale Data security device
NL8401989A (nl) * 1984-06-22 1986-01-16 Nederlanden Staat Video-eindstation met beeldlijnverhaspeling.
SE448803B (sv) * 1986-05-22 1987-03-16 Ljungmans Ind Ab Sett att forhindra obehorig atkomst av information

Also Published As

Publication number Publication date
FR2641656B1 (fr) 1991-08-02
NO895116L (no) 1990-06-21
NO895116D0 (no) 1989-12-19
HK80697A (en) 1997-06-20
EP0375546A1 (fr) 1990-06-27
EP0375546B1 (fr) 1993-11-10
ATE97245T1 (de) 1993-11-15
NO177073B (no) 1995-04-03
ES2048311T3 (es) 1994-03-16
DE68910657D1 (de) 1993-12-16
DE68910657T2 (de) 1994-02-24
FR2641656A1 (fr) 1990-07-13

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Legal Events

Date Code Title Description
MK1K Patent expired