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FR2666921B1 - Procede de codage de haute securite et dispositif de mise en óoeuvre de ce procede. - Google Patents

Procede de codage de haute securite et dispositif de mise en óoeuvre de ce procede.

Info

Publication number
FR2666921B1
FR2666921B1 FR9011777A FR9011777A FR2666921B1 FR 2666921 B1 FR2666921 B1 FR 2666921B1 FR 9011777 A FR9011777 A FR 9011777A FR 9011777 A FR9011777 A FR 9011777A FR 2666921 B1 FR2666921 B1 FR 2666921B1
Authority
FR
France
Prior art keywords
carrying
high security
security encoding
encoding method
security
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 - Lifetime
Application number
FR9011777A
Other languages
English (en)
Other versions
FR2666921A1 (fr
Inventor
Roubal Philippe
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR9011777A priority Critical patent/FR2666921B1/fr
Publication of FR2666921A1 publication Critical patent/FR2666921A1/fr
Application granted granted Critical
Publication of FR2666921B1 publication Critical patent/FR2666921B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/06—Monitoring of the line circuits, e.g. signalling of line faults
    • G08B29/08—Signalling of tampering with the line circuit
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/06—Monitoring of the line circuits, e.g. signalling of line faults

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Alarm Systems (AREA)
FR9011777A 1990-09-19 1990-09-19 Procede de codage de haute securite et dispositif de mise en óoeuvre de ce procede. Expired - Lifetime FR2666921B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9011777A FR2666921B1 (fr) 1990-09-19 1990-09-19 Procede de codage de haute securite et dispositif de mise en óoeuvre de ce procede.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9011777A FR2666921B1 (fr) 1990-09-19 1990-09-19 Procede de codage de haute securite et dispositif de mise en óoeuvre de ce procede.

Publications (2)

Publication Number Publication Date
FR2666921A1 FR2666921A1 (fr) 1992-03-20
FR2666921B1 true FR2666921B1 (fr) 1992-11-20

Family

ID=9400606

Family Applications (1)

Application Number Title Priority Date Filing Date
FR9011777A Expired - Lifetime FR2666921B1 (fr) 1990-09-19 1990-09-19 Procede de codage de haute securite et dispositif de mise en óoeuvre de ce procede.

Country Status (1)

Country Link
FR (1) FR2666921B1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3801960A (en) * 1972-07-21 1974-04-02 Mosler Safe Co Night depository line security
US3866217A (en) * 1972-12-26 1975-02-11 Currier Smith Corp Monitoring transmission link by comparing pseudorandom signals
US4044351A (en) * 1974-06-24 1977-08-23 Walter Kidde & Company, Inc. System monitor with innate line security ability
DE2819909A1 (de) * 1978-05-06 1979-11-15 Merk Gmbh Telefonbau Fried Verfahren zur ueberwachung von mit erhoehter sicherheit betriebenen meldeleitungen
US4850018A (en) * 1986-07-01 1989-07-18 Baker Industries, Inc. Security system with enhanced protection against compromising
GB2228602A (en) * 1989-02-27 1990-08-29 Shorrock Ltd A secure data communication system

Also Published As

Publication number Publication date
FR2666921A1 (fr) 1992-03-20

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Legal Events

Date Code Title Description
CA Change of address
CA Change of address
ST Notification of lapse