PT73815B - DEVICE FOR CLOSED INFORMATION TRANSMISSION - Google Patents

DEVICE FOR CLOSED INFORMATION TRANSMISSION

Info

Publication number
PT73815B
PT73815B PT73815A PT7381581A PT73815B PT 73815 B PT73815 B PT 73815B PT 73815 A PT73815 A PT 73815A PT 7381581 A PT7381581 A PT 7381581A PT 73815 B PT73815 B PT 73815B
Authority
PT
Portugal
Prior art keywords
information transmission
closed information
closed
transmission
information
Prior art date
Application number
PT73815A
Other languages
German (de)
Portuguese (pt)
Other versions
PT73815A (en
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 PT73815A publication Critical patent/PT73815A/en
Publication of PT73815B publication Critical patent/PT73815B/en

Links

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

Landscapes

  • 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)
PT73815A 1980-10-16 1981-10-13 DEVICE FOR CLOSED INFORMATION TRANSMISSION PT73815B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19803039105 DE3039105A1 (en) 1980-10-16 1980-10-16 DEVICE FOR ENCRYPTED INFORMATION TRANSFER

Publications (2)

Publication Number Publication Date
PT73815A PT73815A (en) 1981-11-01
PT73815B true PT73815B (en) 1983-04-14

Family

ID=6114525

Family Applications (1)

Application Number Title Priority Date Filing Date
PT73815A PT73815B (en) 1980-10-16 1981-10-13 DEVICE FOR CLOSED INFORMATION TRANSMISSION

Country Status (6)

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

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4549308A (en) * 1982-07-12 1985-10-22 At&T Bell Laboratories Secure mobile radio telephony
DE3410936C2 (en) * 1984-03-24 1997-09-18 Philips Patentverwaltung Method for recognizing the unauthorized use of an identification assigned to a mobile radio station in a radio transmission system
DE4403998A1 (en) * 1994-02-09 1995-08-10 Rohde & Schwarz Remote control system for mines
DE4416598A1 (en) * 1994-05-11 1995-11-16 Deutsche Bundespost Telekom Securing telecommunication connection against unauthorised use

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1948096C1 (en) * 1969-09-23 1977-11-10 Siemens Ag Transmission system working with binary characters, in particular PCM system or system with pulse delta modulation
CH540613A (en) * 1970-12-08 1973-08-15 Gretag Ag Method and device for encrypted message transmission
DE2824137C2 (en) * 1978-06-02 1980-06-26 Siemens Ag, 1000 Berlin Und 8000 Muenchen Device for phase synchronization

Also Published As

Publication number Publication date
GR75090B (en) 1984-07-13
PT73815A (en) 1981-11-01
EP0050268A1 (en) 1982-04-28
NO813476L (en) 1982-04-19
DK457381A (en) 1982-04-17
DE3039105A1 (en) 1982-04-29

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