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On the topic of "Snake Oi" Programs Like DD and things like electron microsopes do magic for recovering data that these magnificent applications supposed delete. While at a recent security conference in DC I heard a story on this topic. A warrant was served at a residence and the individual in an effort to cover there tracks actually shot his computer with a 9mm pistol and happened to hit a portion of the hard drive. The hardrive
That depends on how many "repetitions of destruction" are done. If you use the DoD spec of 7 wipes, and three different kinds of destruction, for a total of 21 passes, even an electron microscope is not going to help. The more times the data is wiped over, the more impossible it is to get. Also, most law enforcement agencies don't have the money in their budget for an electron microscope.
And providing proxies to allow someone to circumvent filtering from work or school, or NOT violate ANY laws. If it did, Tor would have been shut down long ago. Open source proxy programs, such as phpProxy would not be widely available on the Internet.
Get this and get this good, it is ONLY illegal to circumvent filtering systems if you BREAK someone's PASSWORD. If the filter FAILS to block it, then you CANNOT be charged with ANY crime for accessing any web site that the filter fails to block. While you could probably still fire someone, you could NOT charge them with a crime.