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Column masking of tables

  • US 7,310,647 B2
  • Filed: 01/23/2004
  • Issued: 12/18/2007
  • Est. Priority Date: 12/24/2003
  • Status: Active Grant
First Claim
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1. A machine-implemented method for managing access to data, the method comprising the steps of:

  • detecting that a database statement is issued;

    wherein said database statement requires access to at least one column in a table;

    invoking a policy function which database metadata associates with at least one column in a table;

    receiving an expression returned by invoking said policy function;

    rewriting said database statement by creating a modified database statement that incorporates said expression;

    wherein the modified database statement specifies, based on the expression, whether to mask a value of the at least one column by returning a mask of the value instead of the value; and

    executing said modified database statement.

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