Re: [SLUG] Erasing backup tapes?

From: Derek Glidden (dglidden@illusionary.com)
Date: Wed Jun 05 2002 - 10:35:12 EDT


On Wed, 2002-06-05 at 09:03, Ben Ostrowsky wrote:

> I've been told that writing from /dev/urandom until the tape fills up
> would do the trick, but I don't even know how to do that!

cat /dev/urandom > /dev/st0

or even

tar cf /dev/st0 /dev/urandom

I like the latter as it will make it look like there's something there
if someone does decide to take a look. Let 'em try to break the
encryption on it... ;)

FWIW - why are you throwing them out? Do they no longer work
correctly? DDS1/2/3? I have a DDS2 DAT drive that I'm always looking
for more tapes...

-- 
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
#!/usr/bin/perl -w
$_='while(read+STDIN,$_,2048){$a=29;$b=73;$c=142;$t=255;@t=map
{$_%16or$t^=$c^=($m=(11,10,116,100,11,122,20,100)[$_/16%8])&110;
$t^=(72,@z=(64,72,$a^=12*($_%16-2?0:$m&17)),$b^=$_%64?12:0,@z)
[$_%8]}(16..271);if((@a=unx"C*",$_)[20]&48){$h=5;$_=unxb24,join
"",@b=map{xB8,unxb8,chr($_^$a[--$h+84])}@ARGV;s/...$/1$&/;$d=
unxV,xb25,$_;$e=256|(ord$b[4])<<9|ord$b[3];$d=$d>>8^($f=$t&($d
>>12^$d>>4^$d^$d/8))<<17,$e=$e>>8^($t&($g=($q=$e>>14&7^$e)^$q*
8^$q<<6))<<9,$_=$t[$_]^(($h>>=8)+=$f+(~$g&$t))for@a[128..$#a]}
print+x"C*",@a}';s/x/pack+/g;eval 

usage: qrpff 153 2 8 105 225 < /mnt/dvd/VOB_FILENAME \ | extract_mpeg2 | mpeg2dec -

http://www.cs.cmu.edu/~dst/DeCSS/Gallery/ http://www.eff.org/ http://www.anti-dmca.org/



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