On 8/1/06, User Freebsd <[EMAIL PROTECTED]> wrote:
On Tue, 1 Aug 2006, Nikolas Britton wrote:> On 8/1/06, Robert Huff <[EMAIL PROTECTED]> wrote: >> User Freebsd writes: >> > Actually, using ifconfig wouldn't work ... it would give unique, but as >> > soon as you add another IP (ie. alias), the ID would change ... you'd >> need >> > to do something like: >> > >> > ifconfig | grep ether | sha256 | md5 >> > >> > since the 'ether' would never change ... >> >> At least some cards (+ FreeBSD drivers) allow you to set the >> MAC address .... >> >> >> > > You still don't get it! Maybe this simple perl program will illustrate > the problem: > > my $number = "100000000000000000000"; > my $randomkey = ""; > while (0 == 0) { > $randomkey = `echo $number | md5`; > print "fetch http://www.hub.org/freebsd_stats.php?HOSTID=$randomkey";; > $number++ > } > > Also by using only the mac address output of ifconfig you have limited > the pool of unique keys to 16^12 (281,474,976,710,656)!!! All I need > to do to find your mac address is compute all possible mac address > combinations into MD5 and then just simply match it up with yours. > Anonymity only works if the input is large then the output!!! Because > it's computationally impossible to compute all values of a 500+ byte > string etc. etc. The MD5 string maps back to at least (how do you > compute the collisions?) two SHA256 keys and the SHA256 maps back to > at least two ifconfig strings. Thing is, we aren't so much looking for anonymity as we are uniqueness, but, wouldn't the CPU serial id not be both? >
Ok.. lets start from the top, again. Why do we need uniqueness? -- BSD Podcasts @: http://bsdtalk.blogspot.com/ http://freebsdforall.blogspot.com/ _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
