FR2439444A1 - Dispositif reversible de sur-codage pour la transmission confidentielle d'information pouvant etre imprimee - Google Patents

Dispositif reversible de sur-codage pour la transmission confidentielle d'information pouvant etre imprimee

Info

Publication number
FR2439444A1
FR2439444A1 FR7829727A FR7829727A FR2439444A1 FR 2439444 A1 FR2439444 A1 FR 2439444A1 FR 7829727 A FR7829727 A FR 7829727A FR 7829727 A FR7829727 A FR 7829727A FR 2439444 A1 FR2439444 A1 FR 2439444A1
Authority
FR
France
Prior art keywords
coded
sign
codes
transmission
discriminator
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.)
Withdrawn
Application number
FR7829727A
Other languages
English (en)
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.)
LAPEYRONNIE E
Original Assignee
LAPEYRONNIE E
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 LAPEYRONNIE E filed Critical LAPEYRONNIE E
Priority to FR7829727A priority Critical patent/FR2439444A1/fr
Publication of FR2439444A1 publication Critical patent/FR2439444A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/36—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols with means for detecting characters not meant for transmission
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09C—CIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY
    • G09C1/00—Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system
    • G09C1/06—Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system wherein elements corresponding to the signs making up the clear text are operatively connected with elements corresponding to the signs making up the ciphered text, the connections, during operation of the apparatus, being automatically and continuously permuted by a coding or key member
    • G09C1/10—Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system wherein elements corresponding to the signs making up the clear text are operatively connected with elements corresponding to the signs making up the ciphered text, the connections, during operation of the apparatus, being automatically and continuously permuted by a coding or key member the connections being electrical
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/12—Transmitting and receiving encryption devices synchronised or initially set up in a particular manner

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

L'INVENTION CONCERNE UN DISPOSITIF POUR LE CHIFFREMENT ET LE DECHIFFREMENT DE CRYPTOGRAMMES POUVANT ETRE IMPRIMES, FAISANT EMPLOI D'UN SYSTEME DE CODAGE BINAIRE A PLUSIEURS MOMENTS, TEL LE SYSTEME CCIT N2. IL COMPREND DEUX LECTEURS 1, 2 DE BANDES PERFOREES PORTANT L'UNE LE MESSAGE CLAIR M OU LE CRYPTOGRAMME K ET L'AUTRE UNE CLE QUELCONQUE N, UN OPERATEUR DE COMBINAISON LOGIQUE 6, DES DISCRIMINATEURS 11, 16 DES CODES INTERDITS (SIGNAUX DE SERVITUDE D'IMPRESSION), UN GENERATEUR G POUR LEUR SUBSTITUER LE CODE D'UN SIGNE IMPRIMABLE CONVENU ET UN OPERATEUR J POUR L'INVERSION DE L'UN DE LEURS MOMENTS. UN ENSEMBLE 40 PERMET LA MISE EN PAGES, ET UN PROGRAMMATEUR 50 ASSURE LE SUR-CODAGE DES CRYPTOGRAMMES PAR MODIFICATION DU SIGNE DE SUBSTITUTION L SELON UNE LOI PREDETERMINEE. CE PROGRAMMATEUR REDUIT LE RISQUE DE DECHIFFREMENT DES CRYPTOGRAMMES PAR UN TIERS NON CONCERNE ENTRE INDUMENT EN POSSESSION DE LA CLE.
FR7829727A 1978-10-18 1978-10-18 Dispositif reversible de sur-codage pour la transmission confidentielle d'information pouvant etre imprimee Withdrawn FR2439444A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7829727A FR2439444A1 (fr) 1978-10-18 1978-10-18 Dispositif reversible de sur-codage pour la transmission confidentielle d'information pouvant etre imprimee

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7829727A FR2439444A1 (fr) 1978-10-18 1978-10-18 Dispositif reversible de sur-codage pour la transmission confidentielle d'information pouvant etre imprimee

Publications (1)

Publication Number Publication Date
FR2439444A1 true FR2439444A1 (fr) 1980-05-16

Family

ID=9213906

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7829727A Withdrawn FR2439444A1 (fr) 1978-10-18 1978-10-18 Dispositif reversible de sur-codage pour la transmission confidentielle d'information pouvant etre imprimee

Country Status (1)

Country Link
FR (1) FR2439444A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0199161A2 (fr) * 1985-04-25 1986-10-29 ANT Nachrichtentechnik GmbH Procédé de transmission chiffrée bit par bit
EP0418742A1 (fr) * 1989-09-18 1991-03-27 Omnisec Ag Procédé et dispositif pour la transmission confidentielle de données
WO1991016778A1 (fr) * 1990-04-12 1991-10-31 British Telecommunications Public Limited Company Systeme pour empecher un brouilleur de generer des symboles non desires
EP0625845A1 (fr) * 1993-05-17 1994-11-23 Mita Industrial Co., Ltd. Dispositif et procédé de chiffrage pour facsimile
WO2000024171A1 (fr) * 1998-10-19 2000-04-27 Dolby Laboratories Licensing Corporation Procede permettant d'eviter la presence de configurations interdites dans des donnees audio ou video

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0199161A2 (fr) * 1985-04-25 1986-10-29 ANT Nachrichtentechnik GmbH Procédé de transmission chiffrée bit par bit
EP0199161A3 (fr) * 1985-04-25 1988-11-09 ANT Nachrichtentechnik GmbH Procédé de transmission chiffrée bit par bit
EP0418742A1 (fr) * 1989-09-18 1991-03-27 Omnisec Ag Procédé et dispositif pour la transmission confidentielle de données
US5245655A (en) * 1989-09-18 1993-09-14 Buehn Willi Method and a device for the protected transmission of data
WO1991016778A1 (fr) * 1990-04-12 1991-10-31 British Telecommunications Public Limited Company Systeme pour empecher un brouilleur de generer des symboles non desires
GB2258373A (en) * 1990-04-12 1993-02-03 British Telecomm System to prevent a scrambler from generating undesired symbols
GB2258373B (en) * 1990-04-12 1994-04-06 British Telecomm System to prevent a scrambler from generating undesired symbols
US5333197A (en) * 1990-04-12 1994-07-26 British Telecommunications Public Limited Company System to prevent a scrambler from generating undesired symbols
EP0625845A1 (fr) * 1993-05-17 1994-11-23 Mita Industrial Co., Ltd. Dispositif et procédé de chiffrage pour facsimile
WO2000024171A1 (fr) * 1998-10-19 2000-04-27 Dolby Laboratories Licensing Corporation Procede permettant d'eviter la presence de configurations interdites dans des donnees audio ou video
US6233718B1 (en) 1998-10-19 2001-05-15 Dolby Laboratories Licensing Corporation Avoiding forbidden data patterns in coded audio data

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