FR1605458A - Circuitry for setting data receivers - provides continuous transmission of enciphered data transmitted in binary coded form - Google Patents

Circuitry for setting data receivers - provides continuous transmission of enciphered data transmitted in binary coded form

Info

Publication number
FR1605458A
FR1605458A FR904508A FR904508A FR1605458A FR 1605458 A FR1605458 A FR 1605458A FR 904508 A FR904508 A FR 904508A FR 904508 A FR904508 A FR 904508A FR 1605458 A FR1605458 A FR 1605458A
Authority
FR
France
Prior art keywords
circuitry
section
receiver
continuous transmission
binary coded
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
FR904508A
Other languages
French (fr)
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 filed Critical
Application granted granted Critical
Publication of FR1605458A publication Critical patent/FR1605458A/en
Expired 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
    • H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
    • H04L9/065—Encryption by serially and continuously modifying data stream elements, e.g. stream cipher systems, RC4, SEAL or A5/3
    • 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)
  • Facsimile Transmission Control (AREA)

Abstract

The circuitry consists of a receiver installation having a switch clock with associated circuitry for maintaining synchronisation between a transmitter and the receiver. A first section contains a facsimile device, a second section contains voltage sequences stored in a master perforated tape for producing a cipher pulse sequence, and a switch clock mechanism is provided in a third section. The circuitry includes a band-pass filter, a beat generator, a rectifier gates, switches and a mixer in section, with ring counters and storage switches in the second section. The circuitry transmits a pre-arranged signal at intervals, the signal being operative to cause new and hitherto unused sections of cipher running-down periods to be set in the transmitter and the receiver.
FR904508A 1971-07-19 1972-07-19 Circuitry for setting data receivers - provides continuous transmission of enciphered data transmitted in binary coded form Expired FR1605458A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH0043174 1971-07-19

Publications (1)

Publication Number Publication Date
FR1605458A true FR1605458A (en) 1976-05-14

Family

ID=7155108

Family Applications (1)

Application Number Title Priority Date Filing Date
FR904508A Expired FR1605458A (en) 1971-07-19 1972-07-19 Circuitry for setting data receivers - provides continuous transmission of enciphered data transmitted in binary coded form

Country Status (1)

Country Link
FR (1) FR1605458A (en)

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