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Method and computer program product for order preserving symbol based encryption

  • US 9,059,851 B2
  • Filed: 02/22/2011
  • Issued: 06/16/2015
  • Est. Priority Date: 02/23/2010
  • Status: Active Grant
First Claim
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1. A method for generating an encryption dictionary, the method comprises:

  • generating a random value for each plaintext symbol of multiple plaintext symbols; and

    calculating a random token for each plaintext symbol based on a random value of the plaintext symbol and on random values of other plaintext symbols that have a lower lexicographic value than the plaintext symbol;

    wherein the calculating comprises applying a monotonic increasing function;

    wherein the encryption dictionary comprises a mapping between the multiple plaintext symbols and random token of the multiple plaintext symbols based on a sensitivity level of one or more of the symbols, wherein the random token for each plaintext symbol is based on a random value of the plaintext symbol and on random values of other plaintext symbols that have a lower lexicographic value than the plaintext symbol.

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