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Data processing systems with format-preserving encryption and decryption engines

  • US 8,855,296 B2
  • Filed: 12/13/2010
  • Issued: 10/07/2014
  • Est. Priority Date: 06/28/2006
  • Status: Active Grant
First Claim
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1. A method for encrypting a data string to produce a corresponding encrypted data string using a format-preserving block cipher on a data processing system, comprising:

  • wherein the data string contains characters and has a format specifying a legal set of character values for each of the characters of the data string, wherein the data string contains a first string of characters that has a first format specifying a legal set of character values for each of the characters of the first string and contains a second string of characters that has a second format specifying a legal set of character values of each of the characters of the second string;

    with a format-preserving combining operation, combining a first subkey with the first string of characters while preserving the first format of the first string of characters; and

    with the format-preserving combining operation, combining a second subkey with the second string of characters while preserving the second format of the second string of characters.

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