GB2333883B - Low cost countermeasure against compromising electromagnetic computer emanations - Google Patents

Low cost countermeasure against compromising electromagnetic computer emanations

Info

Publication number
GB2333883B
GB2333883B GB9801745A GB9801745A GB2333883B GB 2333883 B GB2333883 B GB 2333883B GB 9801745 A GB9801745 A GB 9801745A GB 9801745 A GB9801745 A GB 9801745A GB 2333883 B GB2333883 B GB 2333883B
Authority
GB
United Kingdom
Prior art keywords
emanations
low cost
countermeasure against
cost countermeasure
electromagnetic computer
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.)
Expired - Fee Related
Application number
GB9801745A
Other versions
GB2333883A (en
GB9801745D0 (en
Inventor
Markus Guenther Kuhn
Ross John Anderson
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
Priority to GB9801745A priority Critical patent/GB2333883B/en
Publication of GB9801745D0 publication Critical patent/GB9801745D0/en
Publication of GB2333883A publication Critical patent/GB2333883A/en
Application granted granted Critical
Publication of GB2333883B publication Critical patent/GB2333883B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
    • G11B5/5552—Track change, selection or acquisition by displacement of the head across disk tracks using fine positioning means for track acquisition separate from the coarse (e.g. track changing) positioning means
    • G11B5/5556—Track change, selection or acquisition by displacement of the head across disk tracks using fine positioning means for track acquisition separate from the coarse (e.g. track changing) positioning means with track following after a "seek"
    • G11B5/556—Track change, selection or acquisition by displacement of the head across disk tracks using fine positioning means for track acquisition separate from the coarse (e.g. track changing) positioning means with track following after a "seek" control circuits therefor
GB9801745A 1998-01-28 1998-01-28 Low cost countermeasure against compromising electromagnetic computer emanations Expired - Fee Related GB2333883B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9801745A GB2333883B (en) 1998-01-28 1998-01-28 Low cost countermeasure against compromising electromagnetic computer emanations

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9801745A GB2333883B (en) 1998-01-28 1998-01-28 Low cost countermeasure against compromising electromagnetic computer emanations

Publications (3)

Publication Number Publication Date
GB9801745D0 GB9801745D0 (en) 1998-03-25
GB2333883A GB2333883A (en) 1999-08-04
GB2333883B true GB2333883B (en) 2002-10-16

Family

ID=10825988

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9801745A Expired - Fee Related GB2333883B (en) 1998-01-28 1998-01-28 Low cost countermeasure against compromising electromagnetic computer emanations

Country Status (1)

Country Link
GB (1) GB2333883B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2365153A (en) 2000-01-28 2002-02-13 Simon William Moore Microprocessor resistant to power analysis with an alarm state
SE522004C2 (en) * 2001-05-09 2004-01-07 Comex Electronics Ab Method and apparatus for reducing the presence of clearing signals from a keyboard
EP1750388A4 (en) 2004-05-24 2013-10-30 Nippon Telegraph & Telephone Information leakage preventive device and information leakage preventive method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4695904A (en) * 1984-05-01 1987-09-22 Victor Company Of Japan, Ltd. Information signal recording disc recorded with an end signal for selectively preventing unwanted access to predetermined recorded information and disc reproducing apparatus therefor
EP0375546A1 (en) * 1988-12-20 1990-06-27 Bull S.A. Method for distorting the key identification of an uncoded keyboard, and circuit for carrying out this method
EP0786757A1 (en) * 1996-01-25 1997-07-30 Adobe Systems Incorporated Adjusting contrast in antialiasing
GB2311673A (en) * 1996-03-29 1997-10-01 Advanced Risc Mach Ltd Digital circuit with modulated clock
GB2313935A (en) * 1995-03-08 1997-12-10 Intel Corp Frequency modulated clock for reduced radiation
GB2330924A (en) * 1997-10-29 1999-05-05 Markus Guenther Kuhn Software piracy detection system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4695904A (en) * 1984-05-01 1987-09-22 Victor Company Of Japan, Ltd. Information signal recording disc recorded with an end signal for selectively preventing unwanted access to predetermined recorded information and disc reproducing apparatus therefor
EP0375546A1 (en) * 1988-12-20 1990-06-27 Bull S.A. Method for distorting the key identification of an uncoded keyboard, and circuit for carrying out this method
GB2313935A (en) * 1995-03-08 1997-12-10 Intel Corp Frequency modulated clock for reduced radiation
EP0786757A1 (en) * 1996-01-25 1997-07-30 Adobe Systems Incorporated Adjusting contrast in antialiasing
GB2311673A (en) * 1996-03-29 1997-10-01 Advanced Risc Mach Ltd Digital circuit with modulated clock
GB2330924A (en) * 1997-10-29 1999-05-05 Markus Guenther Kuhn Software piracy detection system

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
M.G.Kuhn et al,"Information Hiding, 2nd I.W.1998",pp 126-143"Soft Tempest: Hidden Data Transmission" *
Phrack magazine, Volume Four, Issue 44, November 1993, E. Mo *

Also Published As

Publication number Publication date
GB2333883A (en) 1999-08-04
GB9801745D0 (en) 1998-03-25

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20040128