Permanent Eraser

Permanent Eraser implements the Guttman method by overwriting your data thirty-five times and scrambling the name of the file and other things before unlinking from the system whereas Secure Empty Trash only uses the Department of Defense seven overwrite method. This would corrupt the data through normal means of reading it and effectively secure your trashcan for MacOSX. Freeware and while not licensed under an open source license, the source is available for educational purposes.
Lifehacker < Edenwaith