GB1249520A - Improvements in or relating to teleprinter systems - Google Patents

Improvements in or relating to teleprinter systems

Info

Publication number
GB1249520A
GB1249520A GB3837369A GB3837369A GB1249520A GB 1249520 A GB1249520 A GB 1249520A GB 3837369 A GB3837369 A GB 3837369A GB 3837369 A GB3837369 A GB 3837369A GB 1249520 A GB1249520 A GB 1249520A
Authority
GB
United Kingdom
Prior art keywords
station
central station
ciphered
characters
output
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
GB3837369A
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of GB1249520A publication Critical patent/GB1249520A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
    • H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/22—Arrangements for preventing the taking of data from a data transmission channel without authorisation
    • 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
    • H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
    • H04L9/3226—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using a predetermined code, e.g. password, passphrase or PIN

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Communication Control (AREA)
  • Telephonic Communication Services (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Computer And Data Communications (AREA)

Abstract

1,249,520. Digital transmission systems. SIEMENS A.G. 31 July, 1969 [1 Aug., 1968], No. 38373/69. Heading H4P. In a teleprinter system comprising a number of out-stations and a central station, e.g. an exchange, after setting up a connection between an out-station and the central station, e.g. by dialling, the out-station sends its identifying signal which, at the central station, is stored and selects a cipher key generator unique to the out-station. Subsequently a cipher code is transmitted by the out-station. This code consists of the output of a cipher key generator identical to that at the central station and comprising a shift register whose output is fed back and added to its input and to selected stages in the register. Alternatively the cipher code consists of a number of telegraph characters generated by the keyboard: in this case the code is also fed to the input of the out-station's cipher key generator. At the central station the cipher code sets up the bistables in the selected generator so that the generators at the two stations have identical settings. The out-station now transmits the identifying signal in ciphered' form. At the central station the signal is deciphered and compared with the stored plain language identifying signal. If the signals are identical, ciphered transmission can proceed. Characters from the keyboard are modulo-2 added to the cipher key generator output, the ciphered characters being transmitted in Start-Stop form. At the central station the ciphered characters are modulo-2 added to the output of the selected generator, the resulting deciphered signals being printed. The transmitted ciphered characters may be added to the output of the generators and fed back to the input of both generators for extra security. At the end of a message, or if transmission error is detected, the connection reverts to plain language mode. The feed back connections in the generators may be altered periodically
GB3837369A 1968-08-01 1969-07-31 Improvements in or relating to teleprinter systems Expired GB1249520A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681762669 DE1762669C3 (en) 1968-08-01 1968-08-01 Arrangement for transmitting messages from a called subscriber station, in particular a data processing system, to a calling subscriber station

Publications (1)

Publication Number Publication Date
GB1249520A true GB1249520A (en) 1971-10-13

Family

ID=5697132

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3837369A Expired GB1249520A (en) 1968-08-01 1969-07-31 Improvements in or relating to teleprinter systems

Country Status (6)

Country Link
BE (1) BE736966A (en)
DE (1) DE1762669C3 (en)
FR (1) FR2014872A1 (en)
GB (1) GB1249520A (en)
LU (1) LU59191A1 (en)
NL (1) NL6911330A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2830894C3 (en) * 1978-07-13 1981-05-21 Siemens AG, 1000 Berlin und 8000 München Circuit arrangement for connecting at least two teletypewriters to a common connection line

Also Published As

Publication number Publication date
BE736966A (en) 1970-02-02
NL6911330A (en) 1970-02-03
LU59191A1 (en) 1969-12-10
DE1762669B2 (en) 1973-06-07
FR2014872A1 (en) 1970-04-24
DE1762669C3 (en) 1974-01-10
DE1762669A1 (en) 1970-09-17

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