HK1001114A1 - System to prevent a scrambler from generating undesired symbols - Google Patents

System to prevent a scrambler from generating undesired symbols

Info

Publication number
HK1001114A1
HK1001114A1 HK98100024A HK98100024A HK1001114A1 HK 1001114 A1 HK1001114 A1 HK 1001114A1 HK 98100024 A HK98100024 A HK 98100024A HK 98100024 A HK98100024 A HK 98100024A HK 1001114 A1 HK1001114 A1 HK 1001114A1
Authority
HK
Hong Kong
Prior art keywords
pct
characters
character
encoded
scrambler
Prior art date
Application number
HK98100024A
Other languages
English (en)
Inventor
Paul Roger Febvre
Original Assignee
British Telecomm
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 British Telecomm filed Critical British Telecomm
Publication of HK1001114A1 publication Critical patent/HK1001114A1/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
    • H04L25/03866—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using scrambling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
    • H04L9/065—Encryption by serially and continuously modifying data stream elements, e.g. stream cipher systems, RC4, SEAL or A5/3
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/12—Transmitting and receiving encryption devices synchronised or initially set up in a particular manner
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/36—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols with means for detecting characters not meant for transmission

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Power Engineering (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Details Of Television Scanning (AREA)
  • Optical Communication System (AREA)
  • Noise Elimination (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Superheterodyne Receivers (AREA)
  • Eye Examination Apparatus (AREA)
  • Bidet-Like Cleaning Device And Other Flush Toilet Accessories (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Studio Circuits (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Surgical Instruments (AREA)
  • Liquid Developers In Electrophotography (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Burglar Alarm Systems (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Computer And Data Communications (AREA)
  • Endoscopes (AREA)
HK98100024A 1990-04-12 1998-01-02 System to prevent a scrambler from generating undesired symbols HK1001114A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909008374A GB9008374D0 (en) 1990-04-12 1990-04-12 Communication system
PCT/GB1991/000579 WO1991016778A1 (en) 1990-04-12 1991-04-12 System to prevent a scrambler from generating undesired symbols

Publications (1)

Publication Number Publication Date
HK1001114A1 true HK1001114A1 (en) 1998-05-22

Family

ID=10674374

Family Applications (2)

Application Number Title Priority Date Filing Date
HK133096A HK133096A (en) 1990-04-12 1996-07-25 System to prevent a scrambler from generating undesired symbols
HK98100024A HK1001114A1 (en) 1990-04-12 1998-01-02 System to prevent a scrambler from generating undesired symbols

Family Applications Before (1)

Application Number Title Priority Date Filing Date
HK133096A HK133096A (en) 1990-04-12 1996-07-25 System to prevent a scrambler from generating undesired symbols

Country Status (11)

Country Link
US (1) US5333197A (xx)
EP (1) EP0524253B1 (xx)
JP (1) JP2922643B2 (xx)
AT (1) ATE154996T1 (xx)
DE (1) DE69126702T2 (xx)
DK (1) DK0524253T3 (xx)
ES (1) ES2104701T3 (xx)
GB (2) GB9008374D0 (xx)
HK (2) HK133096A (xx)
NO (1) NO304869B1 (xx)
WO (1) WO1991016778A1 (xx)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5872822A (en) * 1995-10-26 1999-02-16 Mcdata Corporation Method and apparatus for memory sequencing
WO1998049808A1 (fr) * 1997-04-30 1998-11-05 Sony Corporation Dispositif et procede pour la transmission de donnees numeriques
DE19815408C2 (de) * 1998-04-06 2002-06-20 Rohde & Schwarz Anordnung zum Optimieren der Datenübertragung eines gedächtnisbehafteten Funkkanals
US6233718B1 (en) 1998-10-19 2001-05-15 Dolby Laboratories Licensing Corporation Avoiding forbidden data patterns in coded audio data
US7418098B1 (en) * 2000-11-27 2008-08-26 Protegrity Corporation Data type preserving encryption
ATE375567T1 (de) * 2001-11-23 2007-10-15 Protegrity Res & Dev Verfahren zur erkennung von eindringling in einem datenbanksystem
CN1328874C (zh) 2002-05-10 2007-07-25 索尼株式会社 用于传输数据的方法和装置
GB2430510B (en) * 2005-09-27 2011-05-25 Snell & Wilcox Ltd Improved scrambling
US8225106B2 (en) 2008-04-02 2012-07-17 Protegrity Corporation Differential encryption utilizing trust modes

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3781472A (en) * 1971-04-15 1973-12-25 Datotek Digital data ciphering technique
US3886313A (en) * 1972-09-29 1975-05-27 Datotek Voice security method and system
US3868631A (en) * 1972-10-20 1975-02-25 Datotek Digital cryptographic system and method
US4079188A (en) * 1975-04-14 1978-03-14 Datotek, Inc. Multi-mode digital enciphering system
FR2439444A1 (fr) * 1978-10-18 1980-05-16 Lapeyronnie E Dispositif reversible de sur-codage pour la transmission confidentielle d'information pouvant etre imprimee
US4477912A (en) * 1982-02-12 1984-10-16 Arinc Research Corporation Correlation data communications system
DE3207040A1 (de) * 1982-02-26 1983-09-08 Siemens AG, 1000 Berlin und 8000 München Vefahren und anordnung zum uebertragen von zeichen
US4606056A (en) * 1985-02-04 1986-08-12 Burroughs Corporation Method of encoding and serially transmitting self-clocking data and control characters
DE3514860A1 (de) * 1985-04-25 1986-10-30 ANT Nachrichtentechnik GmbH, 7150 Backnang Verfahren zur bitweise verschluesselten uebertragung
US4771463A (en) * 1986-12-05 1988-09-13 Siemens Transmission Systems, Inc. Digital scrambling without error multiplication
US4811357A (en) * 1988-01-04 1989-03-07 Paradyne Corporation Secondary channel for digital modems using spread spectrum subliminal induced modulation
US5012489A (en) * 1988-11-07 1991-04-30 Hayes Microcomputer Products, Inc. Method for sending a plurality of data channels over a single communications line

Also Published As

Publication number Publication date
NO923945L (no) 1992-12-09
JP2922643B2 (ja) 1999-07-26
HK133096A (en) 1996-08-02
ATE154996T1 (de) 1997-07-15
GB2258373A (en) 1993-02-03
DE69126702D1 (de) 1997-08-07
NO304869B1 (no) 1999-02-22
ES2104701T3 (es) 1997-10-16
JPH05506134A (ja) 1993-09-02
WO1991016778A1 (en) 1991-10-31
NO923945D0 (no) 1992-10-09
US5333197A (en) 1994-07-26
GB9221315D0 (en) 1992-12-02
GB9008374D0 (en) 1990-06-13
GB2258373B (en) 1994-04-06
DK0524253T3 (da) 1998-02-16
EP0524253B1 (en) 1997-07-02
EP0524253A1 (en) 1993-01-27
DE69126702T2 (de) 1997-12-04

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Legal Events

Date Code Title Description
PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)