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Distributed tokenization using several substitution steps

  • US 8,745,094 B2
  • Filed: 03/01/2010
  • Issued: 06/03/2014
  • Est. Priority Date: 03/01/2010
  • Status: Active Grant
First Claim
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1. A method for distributed tokenization of sensitive strings of characters in a local server, the method comprising:

  • receiving at the local server from a central server one or more token lookup tables having a plurality of tokens, each token comprising at least one character;

    receiving a sensitive string of characters at the local server;

    selecting a substring of the sensitive string of characters;

    replacing the selected substring of the sensitive string of characters with a first token from the received token lookup tables to form an intermediate tokenized string of characters;

    selecting a substring of the intermediate tokenized string of characters, the selected substring of the intermediate tokenized string of characters including at least one character replaced by the first token; and

    replacing the selected substring of the intermediate tokenized string of characters with a second token from the received token lookup tables to form a final tokenized string of characters, the second token being different from the first token.

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