On Thu, Jul 14, 2011 at 7:50 PM, Luke-Jr <luke@dashjr.org> wrote:
Just wanted to get these suggestions out here:
1. Write over the old, unencrypted wallet.dat a couple of times with pseudo-
  random data in an attempt to secure-delete it.
 
Writing zeros just once should be sufficient:
http://cmrr.ucsd.edu/people/Hughes/DataSanitizationTutorial.pdf

-Arthur