EP0136681A2 - Procédé de transmission chiffrée d'informations - Google Patents

Procédé de transmission chiffrée d'informations Download PDF

Info

Publication number: EP0136681A2
Authority: EP; European Patent Office
Prior art keywords: code; transmission; terminal; radio; transmitter
Prior art date: 1983-09-30
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.): Granted

Application number

EP84111665A

Other languages

German (de)

English (en)

Other versions

EP0136681B1 (fr

EP0136681A3 (fr

Inventor

Ludwig Dipl.-Ing. Hofmann

Klaus Stadler

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

Siemens Corp

Original Assignee

Siemens AG

Siemens Corp

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.)

1983-09-30

Filing date

1984-09-28

Publication date

1985-04-10

1984-09-28 Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG

1984-09-28 Priority to AT84111665T priority Critical patent/ATE35754T1/de

1985-04-10 Publication of EP0136681A2 publication Critical patent/EP0136681A2/fr

1985-06-05 Publication of EP0136681A3 publication Critical patent/EP0136681A3/xx

1988-07-13 Application granted granted Critical

1988-07-13 Publication of EP0136681B1 publication Critical patent/EP0136681B1/fr

Status Expired legal-status Critical Current

Links

Images

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication

Definitions

the invention relates to a method for encrypted message transmission in transmission systems with fixed and / or mobile subscriber devices (terminals), for example in telephone, car telephone or radio networks.
the invention has for its object to provide an encryption system that can be used in various ways in networks of message transmission and is relatively difficult to listen to automatically.
a code transmitter is arranged in the terminal of the one transmission side and a code evaluator is arranged in the terminal of the other transmission side, which is designed as a central station and is only accessible from the office, and in a first step of the process the transmission page containing the code transmitter, the set code to the other transmission page, evaluated in this and its receiver is set according to the code and that the transmission path for transmitting the encrypted useful signal is then switched through in a second method step in the terminal device containing the code transmitter .
an encryption system for a mobile telephone system is shown in the block diagram.
a mobile device and a base station part are provided which are in radio communication with one another via a radio field FF.
the mobile device contains a handset 1, an LF amplifier and voice scrambler connected to it, which are arranged in box 2, and a radio part 3 connected downstream, the output is connected on the side to an antenna A1.
LF amplifier and voice scrambler 2 are connected to one another via a reception line and a transmission line for the low frequency.
a changeover switch S is inserted into the transmission line and is controlled by a code transmitter 4.
the code transmitter 4 is also connected to the LF amplifier and voice scrambler 2 and effects the code setting therein as well as with a signaling unit 5 which is connected on the output side to the one changeover contact of the changeover switch S and via this changeover switch S to the transmission path the mobile device can be switched on.
the base station part contains a radio part 6 which is connected to an antenna A2 and which is connected to a voice scrambler and an NF adaptation, which are arranged in box 7.
voice scrambler and LF adaptation are carried out for the transmission of the low frequency LF to an overhead control device OLE, not shown in the figure, which forms a connection device between the base station part (radio concentrator) and the telephone network with the switching offices.
Radio part 6 and voice scrambler and LF adaptation 7 are connected to one another via a reception line and a transmission line for the low frequency, a connection to a code evaluator and a synchronization device, which are contained in box 8, being made by the reception line. On the output side, this is connected to the voice scrambler and the NF adaptation 7 for code setting.
the radio parts 3 and 6 in the two terminals can consist of commercially available transceivers which can be interconnected in the manner shown with the respective concealment devices.
the concealment circuit In the present encryption system, a distinction is made in the concealment circuit between one for the mobile stations and one that is provided exclusively for the radio concentrators, that is to say the base station part. It becomes a dynamic shear concealment mode using the 4-band interchanging, which is transmitted, for example, with the aid of a random generator from the mobile subscriber with the transmitter to the concealment device of the radio concentrator with the receiver.
this receiver there is also the possibility of installing this receiver in the overhead control system and / or in the switching centers or also for the B subscriber.
the radio path is encrypted in such a way that the signaling unit 5 first synchronizes the base station part with the mobile device via the changeover switch S controlled by the code transmitter 4.
the dynamic transmitter then transmits the dynamic obfuscation mode from the mobile device to the base station part, and via its code evaluator and synchronization device 8, the code is set in the voice scrambler and the NF adaptation 7, so that the transmitted, veiled signal in the receiver of the base station part is correct is recognized.
the method according to the invention is based on the principle that terminals only generate a transmission code, but cannot evaluate it.
the evaluators are unable to generate the code and, moreover, they are only available in limited numbers.
a strictly hierarchical structure is provided here. I.e. In the relevant networks, several end devices are always connected to a control center, which can only be entered and serviced by authorized personnel.
the key transmitted from the terminal, in this case the mobile device, to a central key device merely forms a pointer in a code table. In this way, security against eavesdropping can be achieved in systems of the same structure by changing the code table.
the advantage of the method according to the invention is that in addition to a large number of obfuscation modes, * ) on the base station side

Landscapes

Engineering & Computer Science (AREA)
Computer Networks & Wireless Communication (AREA)
Signal Processing (AREA)
Mobile Radio Communication Systems (AREA)
Telephonic Communication Services (AREA)
Reverberation, Karaoke And Other Acoustics (AREA)

EP84111665A 1983-09-30 1984-09-28 Procédé de transmission chiffrée d'informations Expired EP0136681B1 (fr)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
AT84111665T ATE35754T1 (de)	1983-09-30	1984-09-28	Verfahren zur verschluesselten nachrichtenuebertragung.

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DE3335672		1983-09-30
DE19833335672 DE3335672A1 (de)	1983-09-30	1983-09-30	Verfahren zur verschluesselten nachrichtenuebertragung

Publications (3)

Publication Number	Publication Date
EP0136681A2 true EP0136681A2 (fr)	1985-04-10
EP0136681A3 EP0136681A3 (fr)	1985-06-05
EP0136681B1 EP0136681B1 (fr)	1988-07-13

Family

ID=6210671

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP84111665A Expired EP0136681B1 (fr)	1983-09-30	1984-09-28	Procédé de transmission chiffrée d'informations

Country Status (3)

Country	Link
EP (1)	EP0136681B1 (fr)
AT (1)	ATE35754T1 (fr)
DE (2)	DE3335672A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
AT393339B (de) *	1987-10-21	1991-09-25	Siemens Ag Oesterreich	Vorrichtung zur verschleierten uebertragung analoger signale
EP1223506A1 (fr) *	2001-01-16	2002-07-17	Telefonaktiebolaget L M Ericsson (Publ)	Générateur de nombres aléatoires se basant sur la compression
WO2002056170A1 (fr) *	2001-01-16	2002-07-18	Telefonaktiebolaget Lm Ericsson (Publ)	Generateur de nombres aleatoires faisant appel a la compression

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US5809148A (en) *	1996-05-17	1998-09-15	Motorola, Inc.	Decryption of retransmitted data in an encrypted communication system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE2722700A1 (de) *	1973-07-06	1978-11-30	Licentia Gmbh	Schaltungsanordnung zum uebertragen von nachrichtensignalen
DE2659622C2 (de) *	1976-12-30	1979-01-04	Siemens Ag, 1000 Berlin Und 8000 Muenchen	Funktelefoniesystem
US4369434A (en) *	1979-12-20	1983-01-18	Gretag Aktiengesellschaft	Enciphering/deciphering system

1983
- 1983-09-30 DE DE19833335672 patent/DE3335672A1/de not_active Withdrawn
1984
- 1984-09-28 AT AT84111665T patent/ATE35754T1/de not_active IP Right Cessation
- 1984-09-28 DE DE8484111665T patent/DE3472742D1/de not_active Expired
- 1984-09-28 EP EP84111665A patent/EP0136681B1/fr not_active Expired

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
AT393339B (de) *	1987-10-21	1991-09-25	Siemens Ag Oesterreich	Vorrichtung zur verschleierten uebertragung analoger signale
EP1223506A1 (fr) *	2001-01-16	2002-07-17	Telefonaktiebolaget L M Ericsson (Publ)	Générateur de nombres aléatoires se basant sur la compression
WO2002056170A1 (fr) *	2001-01-16	2002-07-18	Telefonaktiebolaget Lm Ericsson (Publ)	Generateur de nombres aleatoires faisant appel a la compression

Also Published As

Publication number	Publication date
EP0136681B1 (fr)	1988-07-13
ATE35754T1 (de)	1988-07-15
DE3472742D1 (en)	1988-08-18
DE3335672A1 (de)	1985-04-04
EP0136681A3 (fr)	1985-06-05

Legal Events

Date	Code	Title	Description
1985-02-09	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
1985-04-03	PUAL	Search report despatched	Free format text: ORIGINAL CODE: 0009013
1985-04-10	AK	Designated contracting states	Designated state(s): AT BE CH DE FR GB IT LI NL SE
1985-06-05	AK	Designated contracting states	Designated state(s): AT BE CH DE FR GB IT LI NL SE
1985-07-10	RTI1	Title (correction)
1986-02-05	17P	Request for examination filed	Effective date: 19851126
1986-11-26	17Q	First examination report despatched	Effective date: 19861009
1987-05-06	D17Q	First examination report despatched (deleted)
1988-05-28	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
1988-07-13	AK	Designated contracting states	Kind code of ref document: B1 Designated state(s): AT BE CH DE FR GB IT LI NL SE
1988-07-13	REF	Corresponds to:	Ref document number: 35754 Country of ref document: AT Date of ref document: 19880715 Kind code of ref document: T
1988-08-10	GBT	Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
1988-08-18	REF	Corresponds to:	Ref document number: 3472742 Country of ref document: DE Date of ref document: 19880818
1988-09-09	ET	Fr: translation filed
1988-10-12	ITF	It: translation for a ep patent filed
1989-05-17	PLBE	No opposition filed within time limit	Free format text: ORIGINAL CODE: 0009261
1989-05-17	STAA	Information on the status of an ep patent application or granted ep patent	Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT
1989-07-05	26N	No opposition filed
1989-08-25	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: AT Payment date: 19890825 Year of fee payment: 6
1989-08-31	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: GB Payment date: 19890831 Year of fee payment: 6
1989-09-12	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: SE Payment date: 19890912 Year of fee payment: 6
1989-09-19	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: BE Payment date: 19890919 Year of fee payment: 6
1989-09-28	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: FR Payment date: 19890928 Year of fee payment: 6
1989-09-30	ITTA	It: last paid annual fee
1989-09-30	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: NL Payment date: 19890930 Year of fee payment: 6
1989-11-27	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: DE Payment date: 19891127 Year of fee payment: 6
1989-12-18	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: CH Payment date: 19891218 Year of fee payment: 6
1990-09-28	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: GB Effective date: 19900928 Ref country code: AT Effective date: 19900928
1990-09-29	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: SE Effective date: 19900929
1990-09-30	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: LI Effective date: 19900930 Ref country code: CH Effective date: 19900930 Ref country code: BE Effective date: 19900930
1991-03-31	BERE	Be: lapsed	Owner name: SIEMENS A.G. BERLIN UND MUNCHEN Effective date: 19900930
1991-04-01	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: NL Effective date: 19910401
1991-05-16	NLV4	Nl: lapsed or anulled due to non-payment of the annual fee
1991-05-22	GBPC	Gb: european patent ceased through non-payment of renewal fee
1991-05-30	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: FR Effective date: 19910530
1991-05-31	REG	Reference to a national code	Ref country code: CH Ref legal event code: PL
1991-06-01	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: DE Effective date: 19910601
1991-07-26	REG	Reference to a national code	Ref country code: FR Ref legal event code: ST
1995-01-31	EUG	Se: european patent has lapsed	Ref document number: 84111665.0 Effective date: 19910527

Publication	Publication Date	Title
EP0201126B1 (fr)	1993-06-30	Système de radio-transmission à intégration de services
DE2648273C2 (de)	1982-06-09	Einseitenband-Verfahren zur Informationsübertragung und Vorrichtung zur Durchführung des Verfahrens
EP0107175B1 (fr)	1987-01-28	Méthode de transmission numérique d'informations
DE69600082T2 (de)	1998-03-26	Zeitschlitzanordnung in mobilem kommunikationssystem
DE3688530T2 (de)	1993-09-23	Geraet zur vermeidung des abhoerens eines funksignals, welches zwischen einer festen einrichtung und einer mobilstation uebertragen wird.
DE2659622C2 (de)	1979-01-04	Funktelefoniesystem
DE69108897T2 (de)	1995-08-17	Funksendeempfängersystem.
EP0797876B1 (fr)	2000-01-26	Circuiterie et procede permettant de realiser une voie de retour de donnees d'un recepteur a un emetteur dans un reseau a frequence commune
EP0136681A2 (fr)	1985-04-10	Procédé de transmission chiffrée d'informations
DE69224120T2 (de)	1998-07-16	Quittungssystem für einen Zeitduplexkanal
DE1954754A1 (de)	1971-05-06	Mit Verschluesselung der zu uebertragenden Nachrichtensignale arbeitendes Funktelefoniesystem
EP1034671B1 (fr)	2003-09-24	Procede de reception et de traitement par un terminal d'informations envoyees par une centrale a plusieurs abonnes non definis et terminal avec des moyens pour la mise en oeuvre du procede
EP0063332B1 (fr)	1985-07-31	Dispositif pour la transmission chiffrée d'informations numériques
DE2316166B2 (de)	1979-05-10	Gemeinschaftsantennenanlage mit Alarmgebern für die einzelnen Teilnehmer
EP0074657B1 (fr)	1984-12-27	Procédé assurant la sécurité de la transmission de signaux numériques
DE60116182T2 (de)	2006-09-07	Übertragungsverfahren mit Signalverarbeitung zwischen zwei unterschiedlichen Übertragungs/Empfangs-Schnittstellen
EP0115618A1 (fr)	1984-08-15	Procédé de transmission numérique de la parole utilisant un canal radio unique
DE69532854T2 (de)	2005-04-28	Einrichtung für telekommunikationssysteme
EP0209079B1 (fr)	1992-05-13	Procédé de réalisation d'une communication radio chiffrée
DE4444089C2 (de)	1998-09-17	Sende-Empfangs-Endgerät für ein Kommunikationssystem
DE962866C (de)	1957-04-25	Anordnung fuer kombinierten Fernsteuer- und Fernsprechbetrieb
DE69215183T2 (de)	1997-05-15	Verfahren und Anordnung für Multiplexübertragung von DTMF-Signalen
EP0149766B1 (fr)	1988-06-29	Installation pour le montage d'un cadre à la station émettrice ou le démontage à la station réceptrice pour une liaison par ligne hertzienne digitale
EP0184811B1 (fr)	1991-03-06	Procédé pour la transmission analogique de la parole par radio
DE3937515C2 (fr)	1992-05-21

EP0136681A2 - Procédé de transmission chiffrée d'informations - Google Patents

Info

Links

Images

Classifications

Definitions

Landscapes

Priority Applications (1)

Applications Claiming Priority (2)

Publications (3)

Family

ID=6210671

Family Applications (1)

Country Status (3)

Cited By (3)

Families Citing this family (1)

Family Cites Families (3)

Cited By (3)

Also Published As

Similar Documents

Legal Events