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Using Gutmann method for securely deleting files in Windows.
Gutmann method uses 35 passes over the region to be deleted, 8 of them are Pseudo-random. Considered by some to be highly effective for preventing file recovery.
Requires .NET Framework 4.0
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Systems & Safety Establishment
https://sarab.me
Source Code available in c# with comments.
Reference: http://www.cs.auckland.ac.nz/~pgut001/pubs/secure_del.html
...For the remaining blocks of the cover file till the end of the code is reached,
an adjacent blocknr. represents the same bit as the previous one and a non-adjacent blocknr. (a block will be skipped) a negated previous bit.
It's necessary to use a partition with enough adjacent free blocks (code length + holes for fragmentation) within a blockgroup, for this algorithm to work correctly.