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EP0095923A3 - Communications scrambling systems - Google Patents

Communications scrambling systems Download PDF

Info

Publication number
EP0095923A3
EP0095923A3 EP83303100A EP83303100A EP0095923A3 EP 0095923 A3 EP0095923 A3 EP 0095923A3 EP 83303100 A EP83303100 A EP 83303100A EP 83303100 A EP83303100 A EP 83303100A EP 0095923 A3 EP0095923 A3 EP 0095923A3
Authority
EP
European Patent Office
Prior art keywords
reorganisation
blocks
communications
binary words
scrambling systems
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Withdrawn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
EP83303100A
Other languages
German (de)
French (fr)
Other versions
EP0095923A2 (en
Inventor
Kenneth Austin
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.)
Plessey Co Ltd
Original Assignee
Plessey Co Ltd
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 Plessey Co Ltd filed Critical Plessey Co Ltd
Publication of EP0095923A2 publication Critical patent/EP0095923A2/en
Publication of EP0095923A3 publication Critical patent/EP0095923A3/en
Withdrawn legal-status Critical Current

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Scrambled communications signalling uses signals as transmitted and received that are coded by reorganisation of binary words representing original information signals. That reorganisation not only produces different sequences of blocks of binary words but also provides for variation of the lengths and numbers of such blocks (via memori M100-M115) within each reorganisation. In addition the blocks are read out in reverse order to their storage, and the preferred organisation is via a logic type pseudo random generator that must be synchronised and «seeded» at both transmitter and receiver prior to any transmission.
EP83303100A 1982-06-02 1983-05-31 Communications scrambling systems Withdrawn EP0095923A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8216137 1982-06-02
GB8216137 1982-06-02

Publications (2)

Publication Number Publication Date
EP0095923A2 EP0095923A2 (en) 1983-12-07
EP0095923A3 true EP0095923A3 (en) 1985-08-21

Family

ID=10530811

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83303100A Withdrawn EP0095923A3 (en) 1982-06-02 1983-05-31 Communications scrambling systems

Country Status (2)

Country Link
EP (1) EP0095923A3 (en)
CA (1) CA1205540A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2151886A (en) * 1983-12-21 1985-07-24 British Broadcasting Corp Conditional-access broadcast transmission
NZ266054A (en) * 1993-05-05 1997-05-26 Zunquan Liu Text encryption/decryption
DE69322376T2 (en) * 1993-05-05 1999-05-06 Zunquan San Diego Calif. Liu Data encryption facility and method
GB2288519A (en) * 1994-04-05 1995-10-18 Ibm Data encryption
DE4425158C2 (en) * 1994-07-16 2003-07-03 Deutsche Telekom Ag Method and arrangement for realizing cryptological functions
GB2386041A (en) * 2002-03-01 2003-09-03 Sensaura Ltd A method of modifying intermittent audio signals such as speech or musical notes in real time
FR2837644A1 (en) * 2002-10-25 2003-09-26 Canal Plus Technologies Secure data transmission system for multimedia entitlement management uses message duplication with inverted block order before hash function to obstruct cryptoanalysis
US20060222186A1 (en) * 2005-04-05 2006-10-05 Paige Robert F Multi-channel audio switch
ITRM20070010A1 (en) * 2007-01-09 2008-07-10 Telecomponenti S R L METHOD OF PROCESSING A DIGITAL SIGNAL AND USING SYSTEM OF THIS METHOD.
FR2927493B1 (en) * 2008-02-08 2010-06-11 Philippe Thorel METHOD AND SYSTEM FOR SECURING DATA BROADCASTING

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2307441C1 (en) * 1973-02-15 1975-05-07 Licentia Gmbh Method for obfuscating speech signals
FR2379947A1 (en) * 1977-02-03 1978-09-01 Secre Scrambling method of data transmission - uses sequential data which is multiplexed and de-multiplexed in new sequence with time delay
US4229817A (en) * 1978-04-28 1980-10-21 Datotek, Inc. Portable electronic cryptographic device
WO1983001717A1 (en) * 1981-11-04 1983-05-11 Mccalmont, Arnold, M. Privacy communication system employing time/frequency transformation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2307441C1 (en) * 1973-02-15 1975-05-07 Licentia Gmbh Method for obfuscating speech signals
FR2379947A1 (en) * 1977-02-03 1978-09-01 Secre Scrambling method of data transmission - uses sequential data which is multiplexed and de-multiplexed in new sequence with time delay
US4229817A (en) * 1978-04-28 1980-10-21 Datotek, Inc. Portable electronic cryptographic device
WO1983001717A1 (en) * 1981-11-04 1983-05-11 Mccalmont, Arnold, M. Privacy communication system employing time/frequency transformation

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
1980 CARNAHAN CONFERENCE ON CRIME COUNTERMEASURES, 14th-16th May 1980, Lexington, Kentucky, pages 27-37, New York, US; S. UDALOV: "Analog voice privacy with a microprocessor" *
TECHNISCHE RUNDSCHAU, vol. 68, no. 9, 2nd March 1976, page 21, Bern, CH; "Sprachverschleierungsgerät" *

Also Published As

Publication number Publication date
EP0095923A2 (en) 1983-12-07
CA1205540A (en) 1986-06-03

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Legal Events

Date Code Title Description
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

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: THE PLESSEY COMPANY PLC

17P Request for examination filed

Effective date: 19840416

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17Q First examination report despatched

Effective date: 19871109

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19890704

RIN1 Information on inventor provided before grant (corrected)

Inventor name: AUSTIN, KENNETH