EP0050268A1 - Dispositif pour la transmission chiffrée d'informations - Google Patents

Dispositif pour la transmission chiffrée d'informations Download PDF

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Publication number
EP0050268A1
EP0050268A1 EP81107982A EP81107982A EP0050268A1 EP 0050268 A1 EP0050268 A1 EP 0050268A1 EP 81107982 A EP81107982 A EP 81107982A EP 81107982 A EP81107982 A EP 81107982A EP 0050268 A1 EP0050268 A1 EP 0050268A1
Authority
EP
European Patent Office
Prior art keywords
generator
key
sequence
station
stations
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Withdrawn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
EP81107982A
Other languages
German (de)
English (en)
Inventor
Manfred Ing. Grad. Hanni
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 EP0050268A1 publication Critical patent/EP0050268A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/003—Secret communication by varying carrier frequency at or within predetermined or random intervals

Definitions

  • the invention relates to a device for encrypted information transmission in digitized form via radio between two or more transceiver stations, in particular mobile stations, for transmitting and for decoding the digital signals in a key transmitter by a key transmitter with regard to its PN adjustable sequence PN generator having and in which the mutual synchronization of the encryption units of the individual stations ge by quartz-controlled co-rotating station clocks - is .
  • PN adjustable sequence PN generator having and in which the mutual synchronization of the encryption units of the individual stations ge by quartz-controlled co-rotating station clocks - is .
  • Encryption devices which are intended to ensure a high level of security against unauthorized eavesdropping on the information to be transmitted, are generally implemented with PN generators controlled by a day key, which have a very large PN sequence period.
  • PN generators with very long PN sequence periods require lengthy, single-phase procedures between the interconnecting stations, which are also sensitive to interference. This situation has a particularly unfavorable effect when such key devices are used in tactical operations, where in addition to high-quality secret protection of the information against decryption, an encrypted selective call procedure with a short response time and secure and interference-free synchronization of the information encryption are required.
  • the invention has for its object to provide a high-quality encryption encryption device for a radio network, in particular a mobile radio network, which allows an encrypted selective call with short response time with secure and interference-proof synchronization.
  • the PN generator has a relatively short PN sequence period and the key of the key transmitter in the PN sequence period falling below time intervals by means of a sequence control in fixed predetermined way, for example by a modulo-2 addition, is at least partially continuously linked to the binary output signal of the station clock to a new key, with simultaneous resetting of the PN generator to a predetermined starting position, and that the PN generator with the key is connected via a buffer arrangement which bridges the continuous PN sequence readjustment.
  • the invention is based on the essential finding that high-quality encryption can also be implemented using a PN generator which has only a relatively short PN sequence period if the day key defining this PN generator in its PN sequence is in good time before a PN Sequence period, i.e. in relatively short time intervals with simultaneous resetting of the PN generator, is changed, and that this change can be brought about in an extremely advantageous and simple manner by linking the digital output signal of the station clock with the day key without influencing the safe and interference-free synchronization .
  • the buffer arrangement provided for bridging the continuous PN sequence readjustment can easily have two PN sequence registers, which are alternately periodically switched on the input side via a first switch to the PN generator and alternately periodically on the output side via a second switch to the key switch .
  • Both change-over switches actuated by the sequential control system have the same changeover period predetermined by the periodic resetting of the PN generator, but with a mutual temporal phase shift of preferably 180 °.
  • the selective call can also be designed selectively with regard to the encryption itself in that the binary output signal of the station clock is supplemented by a binary subscriber number which, in the idle state of a station, has its own call number or the radio circuit address assigned to it and when a call is to be given is the call number of the station to be called, and that the binary output signal thus supplemented is continuously linked to the key of the key transmitter in the rhythm of the time intervals falling below the PN sequence period to a new key, with the PN generator being reset at the same time.
  • this selectively encrypted information exchange can also be implemented with simultaneous use of a frequency hopping method in that the output of the buffer arrangement is connected to a frequency address register via a gate circuit controlled by the sequence control, to the output side via a conversion memory of the synthesizer provided for frequency generation is switched on, and that the gate circuit is openly controlled before the start of one of the time slots provided for call purposes or a transmission or reception information block for a number of bits predetermined by the length of a frequency address.
  • the circuit of FIG. 1 has on the right side the quartz generator G, to which the divider chain TK is connected.
  • the divider chain TK has outputs for required clock signals T and further outputs at which the binary output signal of the station clock formed by the quartz generator G, the divider chain TK and the setting device EV is present.
  • the adjusting device EV is used for same setting of all stations of the radio network at the start of operation.
  • the outputs of the setting device EV are connected to a corresponding number of associated inputs of the divider chain TK.
  • the binary clock signal is continuously written into the register R2, which in turn also has a number of memory locations for writing a subscriber number or a radio address. A subscriber number or a radio address is written into register R2 using the number setting NE.
  • the key transmitter SG contains the daily key setting.
  • the key transmitter is connected via its binary outputs to the register R1, in which the day key is stored in the form of a pulse pattern.
  • 1 also has a key register SR, which contains the current setting key for the PN generator connected to it.
  • the output of the PN generator is in turn connected to the key MD2 in the form of a modulo-2 adder via the intermediate storage arrangement ZA, the second input of which supplies the digital signal Sig to be encrypted, and the encrypted signal Sig 'is taken from its output.
  • the receiving side is constructed in the same way, with the difference that the encrypted signal Sig 'is supplied from the left and the decrypted signal Sig occurs at the output. To clarify this fact on the reception side, the corresponding designations are entered in brackets in Fig..1.
  • the modulo 2 adder MD1 is provided for linking the time in register R2 including a subscriber number or a radio circuit address with the day key in register R1. With everyone from the expiry AST triggered new adjustment of the PN generator, the result of the link from the binary sequences written in the registers R1 and R2 is transferred to the key register SR and a new one specified by the changed key in the key register SR when the PN generator is reset to its zero position PN cycle started.
  • the sequence control AST is controlled by the divider chain TK and, when a key is reset, outputs corresponding control signals to the PN generator PN-G, the registers R1 and R2 and the key register SR.
  • the sequencer AST also controls the buffer memory arrangement ZA, which in turn consists of two PN sequence registers PN-R1 and PN-R2 and two switches U1 and U2 actuated by the sequencer AST.
  • the switch U1 alternately connects the inputs of the PN sequence registers PN-R1 and PN-R2 to the output of the PN generator.
  • the change takes place together with the resetting of the PN generator to its zero position.
  • the changeover switch U2 mutually connects the outputs of the PN sequence registers PN-R1 and PN-R2 to the one input of the key MD2.
  • the switchover phase of the switch U2 is shifted by 180 ° compared to the switchover phase of the switch U1. In this way it is achieved that the PN sequence register is alternately filled with a new PN sequence of the PN generator depending on a key reset and then out to the key MD2. will read.
  • Each PN sequence begins at the time of zeroing indicated by NS.
  • the circuit PN-X represents a first PN sequence emitted by the PN generator, which occurs shortly before the PN sequence periods expire switching time UP then changes into a new PN sequence, which is represented by the circle PN-X + 1.
  • This new sequence begins with the zeroing of the PN generator.
  • the new PN sequence represented by the circle PN-X + 2 is transferred again, etc.
  • the key signal at the output of the buffer arrangement ZA is subscriber number selective and in this way enables everyone to be set up To assign a connection for an information exchange to its own key, which has a very high security against decryption due to the constant modification over the time.
  • the key device according to FIG. 1 can also be expanded in addition to obtain connection-selective frequency addresses when using a frequency hopping method.
  • This extension is also shown in Fig. 1.
  • the SYN synthesizer is controlled here by a frequency address register FA-R via a conversion memory USP.
  • the frequency address to be stored in the frequency address register FA-R before the start of a time slot intended for call purposes or a transmission or reception information block is carried out by means of a gate circuit TR controlled by the sequence control AST, to which the key signal at the output of the buffer memory arrangement ZA is fed on the input side.
  • the sequence control AST controls the gate circuit TR open for a time interval at the beginning of a call time slot or before the start of a transmission or reception information block.
  • both stations set to the same subscriber number each roll the same frequency addresses from the subscriber number-selective key signal and thus enable information to be exchanged.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
EP81107982A 1980-10-16 1981-10-06 Dispositif pour la transmission chiffrée d'informations Withdrawn EP0050268A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3039105 1980-10-16
DE19803039105 DE3039105A1 (de) 1980-10-16 1980-10-16 Einrichtung zur verschluesselten informationsuebertragung

Publications (1)

Publication Number Publication Date
EP0050268A1 true EP0050268A1 (fr) 1982-04-28

Family

ID=6114525

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81107982A Withdrawn EP0050268A1 (fr) 1980-10-16 1981-10-06 Dispositif pour la transmission chiffrée d'informations

Country Status (6)

Country Link
EP (1) EP0050268A1 (fr)
DE (1) DE3039105A1 (fr)
DK (1) DK457381A (fr)
GR (1) GR75090B (fr)
NO (1) NO813476L (fr)
PT (1) PT73815B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0112844B1 (fr) * 1982-07-12 1986-08-27 Western Electric Company, Incorporated Procédé et dispositif pour la transmission chiffrée par radio
EP0667506A1 (fr) * 1994-02-09 1995-08-16 Rohde & Schwarz GmbH & Co. KG Télécommande pour mines

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3410936C2 (de) * 1984-03-24 1997-09-18 Philips Patentverwaltung Verfahren zum Erkennen der unerlaubten Benutzung einer, einer beweglichen Funkstation zugeordneten Identifizierung in einem Funkübertragungssystem
DE4416598A1 (de) * 1994-05-11 1995-11-16 Deutsche Bundespost Telekom Verfahren und Vorrichtung zur Sicherung von Telekommunikations-Verbindungen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3808365A (en) * 1970-12-08 1974-04-30 Gretag Ag Method and apparatus for encoding and decoding messages
DE1948096C1 (de) * 1969-09-23 1977-11-10 Siemens Ag Mit Binaerzeichen arbeitendes UEbertragungssystem,insbesondere PCM-System oder System mit Pulsdeltamodulation
DE2824137B1 (de) * 1978-06-02 1979-10-18 Siemens Ag Einrichtung zur Phasensynchronisation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1948096C1 (de) * 1969-09-23 1977-11-10 Siemens Ag Mit Binaerzeichen arbeitendes UEbertragungssystem,insbesondere PCM-System oder System mit Pulsdeltamodulation
US3808365A (en) * 1970-12-08 1974-04-30 Gretag Ag Method and apparatus for encoding and decoding messages
DE2824137B1 (de) * 1978-06-02 1979-10-18 Siemens Ag Einrichtung zur Phasensynchronisation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0112844B1 (fr) * 1982-07-12 1986-08-27 Western Electric Company, Incorporated Procédé et dispositif pour la transmission chiffrée par radio
EP0667506A1 (fr) * 1994-02-09 1995-08-16 Rohde & Schwarz GmbH & Co. KG Télécommande pour mines

Also Published As

Publication number Publication date
GR75090B (fr) 1984-07-13
PT73815A (de) 1981-11-01
PT73815B (de) 1983-04-14
NO813476L (no) 1982-04-19
DK457381A (da) 1982-04-17
DE3039105A1 (de) 1982-04-29

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19811006

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Inventor name: HANNI, MANFRED, ING. GRAD.