GB1137022A - Ciphering device for a two-channel switching system - Google Patents

Ciphering device for a two-channel switching system

Info

Publication number
GB1137022A
GB1137022A GB5164266A GB5164266A GB1137022A GB 1137022 A GB1137022 A GB 1137022A GB 5164266 A GB5164266 A GB 5164266A GB 5164266 A GB5164266 A GB 5164266A GB 1137022 A GB1137022 A GB 1137022A
Authority
GB
United Kingdom
Prior art keywords
channel
key
ciphered
signal
key signal
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
GB5164266A
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.)
Thales SA
Original Assignee
CSF Compagnie Generale de Telegraphie sans Fil 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 CSF Compagnie Generale de Telegraphie sans Fil SA filed Critical CSF Compagnie Generale de Telegraphie sans Fil SA
Publication of GB1137022A publication Critical patent/GB1137022A/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
    • H04L9/0618—Block ciphers, i.e. encrypting groups of characters of a plain text message using fixed encryption transformation
    • H04L9/0637—Modes of operation, e.g. cipher block chaining [CBC], electronic codebook [ECB] or Galois/counter mode [GCM]
    • 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
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0861—Generation of secret information including derivation or calculation of cryptographic keys or passwords
    • H04L9/0877—Generation of secret information including derivation or calculation of cryptographic keys or passwords using additional device, e.g. trusted platform module [TPM], smartcard, USB or hardware security module [HSM]

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Storage Device Security (AREA)

Abstract

1,137,022. Data transmission systems. CSF-COMPAGNIE GENERALE DE TELEGRAPHIE SANS FIL. 17 Nov., 1966 [26 Nov., 1965], No. 51642/66. Heading H4P. In a ciphering and deciphering apparatus digital data on a first channel is ciphered, and ciphered data on a second channel is deciphered, using a random key generator which is shared by both channels. When a signal on the first channel 1 is to be ciphered it passes via switch COM 1, Fig. 2, to unit CHT where it is ciphered with a key signal from key generator CL. The previous key signal, which relates to channel 2, is stored at MP. Under control of clock HO, the key signal for channel 1 is passed to store MT and the store MP is read out to set the key generator CL to the state it had earlier in respect of channel 2. The channel 1 key signal is now read from MT to MP. Clock HOR controls key generator CL which provides a new channel 2 key signal, so that a ciphered signal on channel 2, selected by switches COM, is deciphered in unit CHT. Clock HO next controls the interchange of key signals among MP, MT and CL, as described above, so that CL is ready to generate a new key signal for ciphering channel 1.
GB5164266A 1965-11-26 1966-11-17 Ciphering device for a two-channel switching system Expired GB1137022A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR39945A FR1464899A (en) 1965-11-26 1965-11-26 Encryption device for two-way switching system

Publications (1)

Publication Number Publication Date
GB1137022A true GB1137022A (en) 1968-12-18

Family

ID=8593548

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5164266A Expired GB1137022A (en) 1965-11-26 1966-11-17 Ciphering device for a two-channel switching system

Country Status (7)

Country Link
BE (1) BE690224A (en)
CH (1) CH477136A (en)
DE (1) DE1254670B (en)
FR (1) FR1464899A (en)
GB (1) GB1137022A (en)
NL (1) NL6616617A (en)
SE (1) SE336374B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10256086A1 (en) 2002-11-29 2004-06-17 Leybold Vakuum Gmbh Ball bearings and a vacuum pump equipped with this type of bearing

Also Published As

Publication number Publication date
BE690224A (en) 1967-05-25
DE1254670B (en) 1967-11-23
SE336374B (en) 1971-07-05
FR1464899A (en) 1967-01-06
CH477136A (en) 1969-08-15
NL6616617A (en) 1967-05-29

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