CA2174299A1 - Method and Apparatus for Securing Executable Programs Against Copying - Google Patents

Method and Apparatus for Securing Executable Programs Against Copying

Info

Publication number
CA2174299A1
CA2174299A1 CA2174299A CA2174299A CA2174299A1 CA 2174299 A1 CA2174299 A1 CA 2174299A1 CA 2174299 A CA2174299 A CA 2174299A CA 2174299 A CA2174299 A CA 2174299A CA 2174299 A1 CA2174299 A1 CA 2174299A1
Authority
CA
Canada
Prior art keywords
processor
program data
volatile memory
program
secure
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
CA2174299A
Other languages
French (fr)
Other versions
CA2174299C (en
Inventor
Edward L. Schwartz
Michael J. Gormish
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Publication of CA2174299A1 publication Critical patent/CA2174299A1/en
Application granted granted Critical
Publication of CA2174299C publication Critical patent/CA2174299C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
    • G06F21/12—Protecting executable software
    • G06F21/121—Restricting unauthorised execution of programs
    • G06F21/123—Restricting unauthorised execution of programs by using dedicated hardware, e.g. dongles, smart cards, cryptographic processors, global positioning systems [GPS] devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F2221/2107—File encryption

Abstract

A secure system for executing program code in an insecure environment while making it impossible, or at least impractical, to determine how to copy the program code and associated data is provided. A program memory contains encrypted program data and security circuitry contained within an integrated circuit is provided for decrypting the program data as it is needed by a processor. A portion of the processing steps which would be done by the processor in an insecure system is performed in this secure system within the secure circuitry using portions of the decrypted program data which are not provided to the processor. Program data is parsed it out based on a proper request to the security chip from the processor. A key value stored in volatile memory is used in the decrypting process and the volatile memory is positioned on the integrated circuit such that its contents are lost before a chip peel provides access to the volatile memory.
CA002174299A 1995-04-18 1996-04-16 Method and apparatus for securing executable programs against copying Expired - Fee Related CA2174299C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/423,402 1995-04-18
US08/423,402 US5675645A (en) 1995-04-18 1995-04-18 Method and apparatus for securing executable programs against copying

Publications (2)

Publication Number Publication Date
CA2174299A1 true CA2174299A1 (en) 1996-10-19
CA2174299C CA2174299C (en) 1999-05-04

Family

ID=23678781

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002174299A Expired - Fee Related CA2174299C (en) 1995-04-18 1996-04-16 Method and apparatus for securing executable programs against copying

Country Status (3)

Country Link
US (2) US5675645A (en)
CA (1) CA2174299C (en)
TW (1) TW302455B (en)

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Also Published As

Publication number Publication date
US5675645A (en) 1997-10-07
TW302455B (en) 1997-04-11
USRE40405E1 (en) 2008-06-24
CA2174299C (en) 1999-05-04

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