|
Posted by The Ghost In The Machine on 01/05/07 02:10
In comp.os.linux.advocacy, JoeBloe
<joebloe@thebarattheendoftheuniverse.org>
wrote
on Thu, 04 Jan 2007 17:38:37 -0800
<fuarp25vt331b8rm7ukt1iofqhc1u4v3hq@4ax.com>:
> On Thu, 4 Jan 2007 08:09:15 -0800, The Ghost In The Machine
> <ewill@sirius.tg00suus7038.net> Gave us:
>
>>In comp.os.linux.advocacy, Wayne McClaine
>><gary.griffith@gmail.com>
>> wrote
>>on 3 Jan 2007 21:19:22 -0800
>><1167887962.598432.130480@31g2000cwt.googlegroups.com>:
>>>
>>> Tim Smith wrote:
>>>>
>>>> This depends on what you mean by "broke". In particular, do you
>>>> consider a successful brute force attack a break? With its mere 40-bit
>>>> key length, and weak algorithms, CSS falls fairly quickly to a brute
>>>> force attack, in about 2^25 steps.
>>>
>>> Any encrypted cipher can be "foiled" by brute force - you're just
>>> looking for a key.
>>
>>2^40 = 1.10 trillion. If one can look at a key every microsecond, that
>>only takes about a week and a half. That's about what it took a French
>>compute farm, if memory serves.
>>
>>2^56 = 7.21 * 10^16. At the same key rate, that'll only take about 2.3
>>millennia. Fortunately, distributed.net has a faster key rate, since
>>the problem is inherently parallel.
>>
>>2^1024 = 1.80 * 10^100, or 1.80 googols. Search company, meet
>>military-grade encryption-cipher. Dare I mention that the Universe is
>>at the very very most 80 billion years old or so?
>>
>>>
>>> When it is doable in a relatively short time, it's broken. Not
>>> circumvented or broken "into", no magic bullet, but might as well be -
>>> even if you can't derive the key, if you can run through all
>>> possibilities, then what's the difference? You can get the key, and
>>> systems built on this are houses-of-cards. Hence, AES, 3DES, etc.
>>>
>>> So, our boy got a PowerDVD software key to then expose the DVD title &
>>> volume keys and such. And this is impossible for other players, how?
>>> Yawn.
>>>
>>
>>How big is the key?
>>
>
> The problem isn't the key or that you have a distributed app to
> try keys. The problem is what do you try them on?
>
> A .vob file?
I'll admit I have no clue at this point. My general understanding
regarding dvd's is flimsy at best, although I know I can play
$ mplayer dvd://1
and it generally works. :-) I've not tried to burn any (and currently
have no media for such anyway).
--
#191, ewill3@earthlink.net
New Technology? Not There. No Thanks.
--
Posted via a free Usenet account from http://www.teranews.com
[Back to original message]
|