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MULTI-LEVEL DATA ENCRYPTION AND DECRYPTION SYSTEM AND METHOD THEREOF

  • US 20090323937A1
  • Filed: 09/30/2008
  • Published: 12/31/2009
  • Est. Priority Date: 06/27/2008
  • Status: Active Grant
First Claim
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1. A multi-level data encryption method, comprising:

  • dividing a data into a plurality of sub-data blocks according to a plurality of levels, wherein each of the levels is corresponding to at least one user;

    generating an encryption key for each of the levels according to a level generation key and a time key of each the level; and

    respectively encrypting the sub-data blocks of the levels by using the encryption keys of the levels,wherein the level generation key and the time key of a lower level are generated according to the level generation key and the time key of an upper level, and the time keys are generated according to a time generation key and a time seed, wherein the time seed is periodically updated according to different encryption periods.

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