GB1119491A - Cryptographic system which will stand the repeated use of the key material - Google Patents

Cryptographic system which will stand the repeated use of the key material

Info

Publication number
GB1119491A
GB1119491A GB1420065A GB1420065A GB1119491A GB 1119491 A GB1119491 A GB 1119491A GB 1420065 A GB1420065 A GB 1420065A GB 1420065 A GB1420065 A GB 1420065A GB 1119491 A GB1119491 A GB 1119491A
Authority
GB
United Kingdom
Prior art keywords
iii
modulo
memory
shift register
decoding
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
GB1420065A
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.)
Philips USFA NV
Original Assignee
Philips USFA NV
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 Philips USFA NV filed Critical Philips USFA NV
Publication of GB1119491A publication Critical patent/GB1119491A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04L9/06—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
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/12—Details relating to cryptographic hardware or logic circuitry

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)
  • Storage Device Security (AREA)
  • Error Detection And Correction (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

1,119,491. Data transmission systems. PHILIPS USFA N.V. 2 April, 1965 [11 June, 1964], No. 14200/65. Heading H4P. In a coding and decoding circuit, key symbols S 1 and S 2 are stored in memories II and I respectively and memory III stores the plain text when coding and the cryptotext when decoding. I, II and III may also operate as a cyclic counter, shift register and modulo-two feedback shift register respectively. During coding the content of III is added modulo-two to that of memory II and is transferred into II through modulo-two circuit 5. For decoding, the content of II is added modulo-two, to that of III, the result shifted into III, again through circuit 5. The memories I, II, III are controlled by the pulse generator 10 and the divider and gates 9, 16. The shift register III, which is coupled to the memory II through the modulotwo adder 7, is operated, i.e. counts, in a direction determined by the relative lengths of the crypto symbol and symbol S 1 in II. The counter I, containing S 2 counts back to the zero or a predetermined fixed position when it stops and interrupts register III after passing through an equal number of steps.
GB1420065A 1964-06-11 1965-04-02 Cryptographic system which will stand the repeated use of the key material Expired GB1119491A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6406604A NL6406604A (en) 1964-06-11 1964-06-11

Publications (1)

Publication Number Publication Date
GB1119491A true GB1119491A (en) 1968-07-10

Family

ID=19790279

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1420065A Expired GB1119491A (en) 1964-06-11 1965-04-02 Cryptographic system which will stand the repeated use of the key material

Country Status (6)

Country Link
DE (1) DE1472329C3 (en)
DK (1) DK289965A (en)
FR (1) FR1587320A (en)
GB (1) GB1119491A (en)
NL (2) NL6406604A (en)
NO (1) NO128843B (en)

Also Published As

Publication number Publication date
DK289965A (en) 1982-04-28
DE1472329A1 (en) 1969-04-17
DE1472329B2 (en) 1974-05-16
FR1587320A (en) 1970-03-20
DE1472329C3 (en) 1975-01-02
NL6406604A (en) 1968-02-26
NL126875C (en)
NO128843B (en) 1974-01-14

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