[ale] little math
lists at serioustechnology.com
Fri Feb 12 10:26:22 EST 2010
Jim Popovitch wrote:
> On Thu, Feb 11, 2010 at 10:05, Geoffrey <lists at serioustechnology.com> wrote:
>> Boris Borisov wrote:
>>> Why you just not create small file ( 2 MB ) with random data and dd it
>>> to the disk. dd ~/random.file > /dev/hda.. Never tried but won't call
>>> CPU to calculate every random number. Must be random enough.
>> The randomness of such a solution is, a, not random? You'd simply be
>> repeating that same data, hence not random.
> But the data that is being repeated is itself random. So you would
> essentially be repeating random data sequentially. The only pattern
> is the random data.
As I see it, he's creating a single 2 mb random file. Then write that
repeatedly to the disk. You've just created a pattern. If you now
write encrypted data to that drive, you can easily spot it as the rest
of the disk is chunks of 2mb data that are all identical.
> -Jim P.
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> Ale at ale.org
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Until later, Geoffrey
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