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Deriving a symmetric key from an asymmetric key for file encryption or decryption

  • US 20040146015A1
  • Filed: 01/27/2003
  • Published: 07/29/2004
  • Est. Priority Date: 01/27/2003
  • Status: Active Grant
First Claim
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1. A method comprising:

  • accessing a private key of an asymmetric key pair in a key device;

    deriving a symmetric master key from the private key of the asymmetric key pair; and

    storing the symmetric master key in a computer memory location, wherein files can be encrypted or decrypted in response to the symmetric master key.

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