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Senf (sensitive number finder) is a software program that allows users to quickly scan their computers for sensitive numbers. It is written in Java by The University of Texas at Austin Information Security Office (ISO), so it will run on most platforms.

Note: This tool does not guarantee your computer is free of social security and credit card numbers. It simply reports files that contain numbers which look like they could pose a security threat.


  • Identifies files that may contain social security numbers (SSN)
  • Identifies files that may contain credit card numbers (CCN)
  • Developed and approved by ISO

System Requirements

Regardless of operating system, This software requires Java Runtime Environment (JRE) version 1.5 or greater. You can determine which version your system is running and download the latest software at

Note: You do not need the entire Java Software Development Kit (SDK).


Senf was developed under a Creative Commons License, and is available at no cost as long as the conditions of the license are met. If you choose to redistribute Senf, you must provide correct attribution, as described on the ITS Copyright Notice page.

We Can Help

Get help from an expert:

* UT Service Desk

* Call us at 512-475-9400

* Submit a help request online

We also have a walk-in service in the first floor lobby of the Flawn Academic Center (FAC). Stop by and let us help you!