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Method and apparatus for protecting application data in secure storage areas

  • US 6,175,924 B1
  • Filed: 06/20/1997
  • Issued: 01/16/2001
  • Est. Priority Date: 06/20/1997
  • Status: Expired due to Fees
First Claim
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1. A method for loading a certified program CP from external storage into a secure area for execution in the secure area, the certified program CP having an object PN and an attached digital signature DPN, the method comprising the acts of:

  • requesting an operating system resident in the secure area load the program CP;

    retrieving CP from external storage into operating system protected mode memory;

    separating in protected mode memory in the secure area, the digital signature DPN from the object PN of certified program CP;

    validating that digital signature DPN, using a public key corresponding to the private key of a public-private key pair algorithm which was used to generate DPN, is a valid signature for the object PN;

    separating a program P from a name N of the object PN;

    loading program P into memory for execution;

    storing name N in protected operating system memory for later use in allowing access by program P to a data file stored in a memory in the secure area.

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