EP0378446A3 - Signal encryption - Google Patents

Signal encryption Download PDF

Info

Publication number
EP0378446A3
EP0378446A3 EP19900300407 EP90300407A EP0378446A3 EP 0378446 A3 EP0378446 A3 EP 0378446A3 EP 19900300407 EP19900300407 EP 19900300407 EP 90300407 A EP90300407 A EP 90300407A EP 0378446 A3 EP0378446 A3 EP 0378446A3
Authority
EP
European Patent Office
Prior art keywords
signal
encryption
transformed
decryption
transformation
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.)
Granted
Application number
EP19900300407
Other languages
German (de)
French (fr)
Other versions
EP0378446A2 (en
EP0378446B1 (en
Inventor
Joseph Alfred Webb
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0378446A2 publication Critical patent/EP0378446A2/en
Publication of EP0378446A3 publication Critical patent/EP0378446A3/en
Application granted granted Critical
Publication of EP0378446B1 publication Critical patent/EP0378446B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Storage Device Security (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

Methods and apparatus for encrypting and subsequently decrypting an analog or digital signal are disclosed. During encryption the signal waveform is transformed by a substantially continuous non-linear complex function of frequency. The transformation is characterised in that the time duration of a transformed impulse signal is substantially increased. Decryption requires transformation of the encrypted signal by substantially the complex inverse of the encryption function. The transformations may vary in time during encryption/decryption of a signal.
EP90300407A 1989-01-13 1990-01-15 Signal encryption Expired - Lifetime EP0378446B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ22762189 1989-01-13
NZ227621 1989-01-13

Publications (3)

Publication Number Publication Date
EP0378446A2 EP0378446A2 (en) 1990-07-18
EP0378446A3 true EP0378446A3 (en) 1992-05-27
EP0378446B1 EP0378446B1 (en) 1996-07-03

Family

ID=19922724

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90300407A Expired - Lifetime EP0378446B1 (en) 1989-01-13 1990-01-15 Signal encryption

Country Status (4)

Country Link
EP (1) EP0378446B1 (en)
AT (1) ATE140109T1 (en)
DE (1) DE69027612T2 (en)
GR (1) GR3021253T3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6426977B1 (en) * 1999-06-04 2002-07-30 Atlantic Aerospace Electronics Corporation System and method for applying and removing Gaussian covering functions
CN114241654B (en) * 2021-12-17 2023-12-05 国开启科量子技术(北京)有限公司 Composite calculation method and device for distributed quantum ballot

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2094593A (en) * 1981-03-06 1982-09-15 Marconi Co Ltd Signal encryption systems
EP0277392A1 (en) * 1987-01-14 1988-08-10 Koninklijke Philips Electronics N.V. Data transmission system comprising smearing filters

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS587935A (en) * 1981-07-07 1983-01-17 Kokusai Denshin Denwa Co Ltd <Kdd> Transversal type smear/desmear filter
JPS58114641A (en) * 1981-12-28 1983-07-08 Omron Tateisi Electronics Co Communication device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2094593A (en) * 1981-03-06 1982-09-15 Marconi Co Ltd Signal encryption systems
EP0277392A1 (en) * 1987-01-14 1988-08-10 Koninklijke Philips Electronics N.V. Data transmission system comprising smearing filters

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 7, no. 222 (E-201)(1367) 4 October 1983 & JP-A-58 114 641 ( TATEISHI ) 8 July 1983 *

Also Published As

Publication number Publication date
ATE140109T1 (en) 1996-07-15
GR3021253T3 (en) 1997-01-31
DE69027612T2 (en) 1997-02-20
DE69027612D1 (en) 1996-08-08
EP0378446A2 (en) 1990-07-18
EP0378446B1 (en) 1996-07-03

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