EP0008086A1 - Dispositif pour la réalisation d'une transmission brouillée d'informations - Google Patents

Dispositif pour la réalisation d'une transmission brouillée d'informations Download PDF

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Publication number
EP0008086A1
EP0008086A1 EP79102784A EP79102784A EP0008086A1 EP 0008086 A1 EP0008086 A1 EP 0008086A1 EP 79102784 A EP79102784 A EP 79102784A EP 79102784 A EP79102784 A EP 79102784A EP 0008086 A1 EP0008086 A1 EP 0008086A1
Authority
EP
European Patent Office
Prior art keywords
clock
time
generator
quasi
transmission
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Withdrawn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
EP79102784A
Other languages
German (de)
English (en)
Inventor
Josef Brusch
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 EP0008086A1 publication Critical patent/EP0008086A1/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Withdrawn legal-status Critical Current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
    • H04K1/06—Secret communication by transmitting the information or elements thereof at unnatural speeds or in jumbled order or backwards

Definitions

  • the invention relates to an arrangement for carrying out a veiled transmission of information, in particular voice, by means of a controllable storage device, into which the information obtained is divided into time elements, one after the other, stored in succession on the transmission side and in turn interchanged for their transmission, and in which the information is stored On the reception side, this interchanging of the time elements has been reversed and in which the control clocks for the memory device on the transmission side and on the reception side are each derived from the clock of a clock generator.
  • the invention is based on the object of specifying a further solution for an arrangement for carrying out a veiled transmission of information by means of time element exchange, which makes this segmentation of the veiled signal by unauthorized persons considerably more difficult.
  • the invention is based on the essential knowledge that the time limits of the successive, in their time position interchanged time elements can vary in an extremely simple manner without intervention in the actual control part, if the clock frequency of the common clock supply is changed randomly within small limits.
  • the information content of a time element is retained, ie the information is only pseudo-randomly lengthened or shortened via the time axis. However, this is sufficient for the difficulty of segmenting a veiled signal, because the information content of a time element itself is not predictable.
  • the quasi-random generator expediently has a very large pulse repetition period, which also makes it difficult to recognize the periodicity of the time variation. In this context, it may make sense to design the quasi-random generator to be programmable.
  • control clock for the quasi-random generator is also derived from the clock of the clock generator.
  • the block diagram according to FIG. 1 shows an arrangement for carrying out the concealment of information to be transmitted, as is to be used for the concealment on the transmission side and for the unveiling on the reception side.
  • the information arriving at the connection terminal x is first amplified in the amplifier V and, after being limited in the filter F, is fed to the actual memory device F.
  • the memory device S is supplied via the clock lines Tl with the necessary control clocks of the clock center TZ, which in turn derives these control clocks from the clock of the clock generator TG.
  • a filter F for frequency band limitation follows again, the output signal of which is fed via the amplifier V to the connection terminal y.
  • the frequency of the clock generator TG is pseudo-randomly controlled by the quasi-random generator QZG, which also receives its clock from the clock center TZ.
  • the clock generator TG consists of a fixed frequency oscillator 0 of high frequency constancy, for example a quartz oscillator, the clock frequency of which is chosen to be significantly higher than the frequencies of the control clocks.
  • the fixed frequency oscillator 0 is followed by the controllable frequency divider FT, whose division ratio n: 1 is changed pseudorandomly via the quasi-random generator QZG.
  • an address decoder AD is provided, which converts code addresses supplied by the quasi-random generator into an analog control signal.
  • the quasi-random generator QZG can receive its clock instead of the clock center TZ directly from the fixed frequency oscillator 0 via a fixed frequency divider FT '.
  • This variant can be used if it is not desired that the quasi-random generator take part in the frequency variation of the clock generator TG.
  • the quasi-random generator QZG according to FIG. 1 continuously supplies code addresses to the memory device via the address lines A1, with the aid of which the time element scrambling to be performed in the memory device S is performed pseudo-randomly.
  • time element interchanging diagram according to FIG. 2 shows, in the embodiment S according to FIG. 3 five successive time elements 1, 2, 3, 4, 5 or 1 ', 2', 3 ', 4', 5 'of the time period to interchanged, the interchanging being varied in accordance with the code addresses supplied by the quasi-random generator QZG according to FIG. 1.
  • the timely storage and the swapped storage of the time elements takes place digitally in the memory device according to FIG. 3.
  • it has a converter A / D on the input side, which on the output side supplies the digitized information about the switch A alternately to the shift register SR1 and SR2. While five time elements are being stored in the shift register SR1, the shift register SR2 is read out and vice versa.
  • the reading is done for the shift register SR1 via the multiplexer M1 and for the shift register SR2 via the multiplexer M2.
  • Both multiplexers vary the readout of the time elements in the sense of the desired exchange as a function of the code addresses supplied by the quasi-random generator via the address lines A1, which are converted in the address converter AU into control signals suitable for the multiplexers.
  • a changeover switch U2 is again provided, which alternately feeds the converted D / A to the converter D / A, on the output side of which, in the shift registers SR1 and SR2, which feeds in the shift registers SR1 and SR2, which are stored via the multiplexers M1 and M2 originally analog information is given in analog but disguised form.
  • the transmission of the transmitted signals on the receiving side takes place in the memory device S in the same way as on the transmitting side, only in the opposite direction.
  • the synchronization of transmission and reception time can be maintained in the usual way by additional transmission of synchronization signals.
  • the initial synchronization for the clock generator and the quasi-random generator can take place by means of advance information for the initial position of the receiving quasi-random generator.
  • the converters A / D and D / A can be omitted in the memory device S if the information to be concealed is digital signals.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Electric Clocks (AREA)
EP79102784A 1978-08-04 1979-08-02 Dispositif pour la réalisation d'une transmission brouillée d'informations Withdrawn EP0008086A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2834281 1978-08-04
DE19782834281 DE2834281A1 (de) 1978-08-04 1978-08-04 Anordnung zur durchfuehrung einer verschleierten uebertragung von informationen

Publications (1)

Publication Number Publication Date
EP0008086A1 true EP0008086A1 (fr) 1980-02-20

Family

ID=6046261

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79102784A Withdrawn EP0008086A1 (fr) 1978-08-04 1979-08-02 Dispositif pour la réalisation d'une transmission brouillée d'informations

Country Status (3)

Country Link
EP (1) EP0008086A1 (fr)
DE (1) DE2834281A1 (fr)
DK (1) DK321779A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0018869A1 (fr) * 1979-04-20 1980-11-12 Etablissement Public Télédiffusion de France Installation de cryptage et de décryptage d'un signal analogique par compressions et expansions temporelles
EP0117276A2 (fr) * 1982-09-20 1984-09-05 Sanyo Electric Co., Ltd. Dispositif de communication secrète
EP0351102A2 (fr) * 1988-07-13 1990-01-17 Marconi Electronic Devices Limited Dispositif de chiffrage
WO2000045551A1 (fr) * 1999-01-27 2000-08-03 International Business Machines Corporation Protection des donnees biometriques grace a un echantillonnage dependant d'une cle
US7412604B1 (en) 2000-03-28 2008-08-12 International Business Machines Corporation Using biometrics on pervasive devices for mobile identification

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2307441C1 (de) * 1973-02-15 1975-05-07 Licentia Gmbh Verfahren zum Verschleiern von Sprachsignalen
DE2412732A1 (de) * 1974-03-16 1975-09-18 Licentia Gmbh Verfahren zum verschleiern von sprachsignalen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2307441C1 (de) * 1973-02-15 1975-05-07 Licentia Gmbh Verfahren zum Verschleiern von Sprachsignalen
DE2412732A1 (de) * 1974-03-16 1975-09-18 Licentia Gmbh Verfahren zum verschleiern von sprachsignalen

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0018869A1 (fr) * 1979-04-20 1980-11-12 Etablissement Public Télédiffusion de France Installation de cryptage et de décryptage d'un signal analogique par compressions et expansions temporelles
EP0117276A2 (fr) * 1982-09-20 1984-09-05 Sanyo Electric Co., Ltd. Dispositif de communication secrète
EP0117276A3 (en) * 1982-09-20 1986-05-21 Sanyo Electric Co., Ltd. Privacy communication method and privacy communication apparatus employing the same
EP0351102A2 (fr) * 1988-07-13 1990-01-17 Marconi Electronic Devices Limited Dispositif de chiffrage
EP0351102A3 (fr) * 1988-07-13 1991-07-17 Marconi Electronic Devices Limited Dispositif de chiffrage
WO2000045551A1 (fr) * 1999-01-27 2000-08-03 International Business Machines Corporation Protection des donnees biometriques grace a un echantillonnage dependant d'une cle
US6507912B1 (en) 1999-01-27 2003-01-14 International Business Machines Corporation Protection of biometric data via key-dependent sampling
CN100414867C (zh) * 1999-01-27 2008-08-27 国际商业机器公司 通过基于密钥的采样对生物统计数据提供保护
CZ300144B6 (cs) * 1999-01-27 2009-02-25 International Business Machines Corporation Ochrana biometrických dat klícove závislým vzorkováním
US7412604B1 (en) 2000-03-28 2008-08-12 International Business Machines Corporation Using biometrics on pervasive devices for mobile identification

Also Published As

Publication number Publication date
DE2834281A1 (de) 1980-02-21
DK321779A (da) 1980-02-05

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Inventor name: BRUSCH, JOSEF