Hello Jasen!

Saturday October 03 1998 06:13, Jasen Betts wrote to LAURENT JUMET:

LJ>>    Purpose is to fill a file with a string, without deleting it or
LJ>> reducing it to zero.

JB> actually, try this (it uses debug):

JB> :: wipe.btm
JB> setlocal
JB> set x=%{at}filesize[%1] %+ set y=
JB> do while %x gt 1
JB> set y=%{at}instr[%{at}eval[ %x %% 16],1,0123456789ABCDEF]%y%
JB> set x=%{at}eval[ %x / 16 ]
JB> enddo
JB> set y=00000000%y
JB> set x=%{at}instr[7,-4,%y] %+ set y=%{at}instr[3,-4,%y]
JB> echo rbx%=r%x%%=rrcx%=r%y%=rn%1%=rw%=rq%|debug

JB> it overwrites the file with the contents of "lower" memory which
JB> shouldn't contain any sensitive information.

    This is a very good work, indeed.
    It's very fast, and the whole file is filled whith non-sensitive data.
    The next time windows will be launched, it will say "Swapfile is
corrupted" but I only need to go to the control panel / virtual
memory, read and type the size again and click OK, that's enough, no need
to really delete/create the swapfile.

Laurent Jumet

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