DFP - #68 Permeant Eraser

Permanent Eraser for Mac provides an even stronger level of
security by implementing the Gutmann Method. This utility
overwrites your data thirty-five times, scrambles the original file
name, and truncates the file size to nothing before Permanent
Eraser finally unlinks it from the system. Once your data has been
erased, it can no longer be read through traditional means.
download it from http://www.edenwaith.com/products/permanenteraser/