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Key management system

  • US 20050251491A1
  • Filed: 07/18/2005
  • Published: 11/10/2005
  • Est. Priority Date: 08/13/1998
  • Status: Active Grant
First Claim
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1. A method of managing keys used by an application on a computer system, said method comprising the steps of:

  • decrypting encrypted digital content data using a first decrypting key to produce content data, the encrypted content data having been produced by encrypting the content data with a first encrypting key;

    re-encrypting the content data using a second encrypting key; and

    encrypting a second decrypting key using a third encrypting key to produce an encrypted second decrypting key, wherein the nth decrypting key is used to decrypt data that has been encrypted with the nth encrypting key.

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