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Data encryption and decryption method and apparatus

  • US 20040139339A1
  • Filed: 11/25/2003
  • Published: 07/15/2004
  • Est. Priority Date: 11/26/2002
  • Status: Abandoned Application
First Claim
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1. A data encryption method, the method including the following steps:

  • Step A;

    constructing a security class database for storing a plurality of entries of records of data, each of the entries of records including a data attribute description field and a corresponding encryption definition field, the encryption definition field including a plurality of encryption algorithm module indicators;

    Step B;

    inputting digital data to be encrypted;

    Step C;

    from the security class database, finding a data attribute description that matches attribute of the digital data, and retrieving the corresponding encryption definition data;

    Step D;

    from the retrieved encryption definition data, selecting at random an encryption algorithm module indicator;

    Step E;

    with the selected encryption algorithm module indicator as a guide, controlling encryption processing of the inputted digital data; and

    Step F;

    appending decryption information to the digital data that has undergone encryption processing for subsequent output.

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