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Storage medium and method and apparatus for separately protecting data in different areas of the storage medium

  • US 7,051,213 B1
  • Filed: 11/06/1998
  • Issued: 05/23/2006
  • Est. Priority Date: 03/18/1998
  • Status: Expired due to Term
First Claim
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1. A storage medium data protecting method of protecting data on a storage medium having a plurality of unit storage areas, comprising:

  • a step of generating a random key, encrypting said random key with a password, and writing said encrypted random key the storage medium;

    a step of encrypting the data with the generated random key, and writing the encrypted data to the storage medium;

    a step of reading said encrypted key from the storage medium;

    a step of decoding said encrypted key with said password; and

    a step of reading and decoding the data on the storage medium with the decoded key,wherein said random key generating step comprises;

    a step of generating a different random key for each unit storage area of the plurality of unit storage areas, so that said each unit storage area is assigned a different random key, and said assignment of said different random key to said each unit storage area being based on a particular unit storage area to which the data, once encrypted, is to be stored;

    a step of encrypting each of the different random keys with said password, anda step of writing each of the encrypted different random keys to the storage medium when initializing the storage medium,wherein said data encrypting step comprises a step of encrypting the data with said different random key data corresponding to its said particular unit storage area to write the data, andwherein said data decoding step comprises a step of decoding the data with said decoded key corresponding to said particular unit storage area where the data have been read.

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