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Transparent encryption and access control for mass-storage devices

  • US 20050246778A1
  • Filed: 04/22/2005
  • Published: 11/03/2005
  • Est. Priority Date: 04/23/2004
  • Status: Active Grant
First Claim
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1. A method of securing data on a mass storage device, the method comprising:

  • obtaining permission for a specified access by a current user to a mass storage device, said mass storage device having one or more blocks of data of a known size stored thereon, each block of data being encrypted with a symmetric cipher that preserves the size of the block;

    if permission is obtained, obtaining the encrypted key of the symmetric cipher used for encrypting the blocks on the mass storage device;

    obtaining the private key or pass phrase for decrypting the encrypted key of the symmetric cipher;

    decrypting the encrypted key using the private key or pass phrase to obtain the key for the symmetric cipher; and

    performing a block operation on the mass storage device with the symmetric cipher.

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