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Reverse Masking Function

The reverse masking function rewrites the

WHERE

clause of masked request statements to return the actual value stored in the database.

You can use the reverse masking function to prevent requests that use masked data. For example, you send a request to the database for an account number and the database returns a masked value. You send another request to the database. The request references the masked account number and the database returns an error message. The reverse masking function replaces the masked

WHERE

clause with actual data and you do not receive an error message.

Reverse Masking Example

The following example shows how to create a reverse masking function. The reverse masking function uses the Search and Replace security rule action to replace the

WHERE

clause in a request statement.

To create reverse masking functions, use nested security rules. The top-level folder uses the Any matcher, the Folder action, and the Continue processing action.

Create two security rules. The first rule performs reverse masking. If the request statement does not match the criteria for the first rule, the Rule Engine applies the second rule. The second rule masks the account information.

In the top level folder, create a security rule called Unmask. The Unmask rule rewrites the

WHERE

clause with the reverse masked value by using regular expression. Configure the security rule to use the Any matcher and the Search and Replace rule action. In the Search Text field, enter

ACCOUNT\s*=\s*(\:\w+)

. Select the Regular Expression identification method. In the Replacement String field, enter

ACCOUNT = substr(\(1),1,6) || translate('3412', '1234', substr(\(1),7)) || subst.(\(1),11)

Select the Continue processing action so that the Rule Engine continues to the next rule in the rule tree.

In the top level folder, create a security rule called Account Masking. Select the Any matcher and the Mask rule action.

In the Table name field, enter

for all tables. In the Column Name field, enter

ACCOUNT

. In the Masking Function field, enter

substr(\(col),1,6) || translate('1234', '3412', substr(\(col),7)) || substr(\(col),11)

Select the Stop if Applied processing action so that the Rule Engine does not continue to the next rule in the rule tree.

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Table of Contents

User Guide

User Guide

Reverse Masking Function

Reverse Masking Function

Reverse Masking Example