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Lord of War gets defeated by high-definition hackers
The hacker who cracked HD DVD strikes again by defeating Blu-ray Disc encryption

Late last year, a crafty individual who goes by the name “Muslix64” circumvented the copy protection scheme used to protect HD DVD. Given the similarities between the copy protection methods used in the high-definition optical formats, it was only a matter of time before Blu-ray Disc’s protections would be bypassed. However, Muslix64 has no access to Blu-ray hardware, limiting his exploit methods to HD DVD. That is, until Muslix64 came across some specific data for Blu-ray Disc, allowing him to apply his methods to the yet-uncracked format.

Another individual interested in Blu-ray’s protection scheme, “Janvitos,” who also participates in the same online forum where Muslix64 revealed his HD DVD work, posted a message showing the directory structure from a Lord of War Blu-ray Disc movie. Janvitos extracted the information by going through his system’s memory with WinHEX after playing the movie on his computer using WinDVD.

The memory dump information caught the attention of Muslix64, who replied to the thread saying, “In less [than] 24 hours, without any Blu-Ray equipment, but with the help of Janvitos, I managed to decrypt and play a Blu-Ray media file using my known-plaintext attack.” Muslix64 then posted a file as an example of his decryption work, though he did say that his method does not address BD+.

Muslix64 then went on to explain how he was able to accomplish this feat with his plaintext attack method. “This is a very basic, but [powerful] crypto attack that I have used to decrypt both [HD DVD and Blu-ray] formats,” he wrote. “After reading posts of people trying to get the keys in memory, I realized, I have a different way of looking into the problem…A lot of people try to attack the software, I'm attacking the data!”

“So I spent more time analysing the data, to look for patterns or something special to mount my known-plaintext attack,” Muslix64 explains. “Because I know the keys are unprotected in memory, I can skip all the [painful] process of code reversal.”

Although Muslix64 did not have any Blu-ray equipment at his disposal, he was still able to recover the keys with the help of Janvitos’ memory dump file and media file. Blu-ray media files are divided into individual aligned units. The first 16 bytes of each unit are not encrypted, with the rest being encrypted using AES in CBC mode. Muslix64 examined the non-encrypted portions of the data and found a reoccurring pattern, which he used to mount his known-plaintext attack.

Muslix64 goes on: “In most cases, the know-plaintext attack is in fact a guessed-plaintext attack. We ‘assume’ the data will look like something we ‘guessed’ when decrypted. Most of the time, it works! Knowing that, all you have to do, is to write a small program that scan a memory dump file, that comes from of a software player while it was playing the movie. The key is in that file, you have to locate it.”

Once the value and position of the key is in memory, all one has to do is to use a memory landmarking function to locate the key and defeat the encryption. The method discovered by Muslix64 and Janvitos is specific to Blu-ray, though similar means were used to decrypt HD DVD. This hack was made possible by the fact that the keys were not protected in memory when running video-playing software on the PC.

Even without any Blu-ray hardware at his disposal, Muslix64 shortly followed his findings reveal with the alpha release of BackupBluRay V.0.21, software he wrote to decrypt Blu-ray Discs. Limitations to his software at this time are that it doesn’t support BD+ or volume unique keys and that it only supports one CPS key per disc. Users wishing to utilize the software will also have to provide their own CPS unit key.

Those who have tried the software report that they have successfully been able to decrypt and copy their own Blu-ray Discs for playback on both PC software and set-top players. If the cracking of HD DVD and the release of pirated files is of any indication, however, Blu-ray may soon see illegal copies hitting the black market and parts of the Internet.

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By shabby on 1/23/2007 8:55:58 PM , Rating: 2
Now where are those cheap burners? :)

RE: ...
By michal1980 on 1/23/07, Rating: -1
RE: ...
By PrinceGaz on 1/24/2007 3:41:00 AM , Rating: 2
The ICT is irrelevant because the protection has been broken and can be completely removed. As far as playback from a PC is concerned, HDCP is history as we now have access to the unencrypted video and audio data and can do with it what we wish: burning, transcoding, whatever.

This news that HDCP has been broken (as I always suspected it would be, though not quite so soon) makes me feel good about ignoring HDCP support when I bought a new 20" LCD monitor last month. Why pay extra for something I would never need, especially when HDCP supporting monitors currently carry quite a price premium over equivalent or better non-HDCP monitors?

Of course all new monitors (except perhaps the cheapest) and graphics-cards will include the HDCP keys soon anyway because the average user will want to be able to just stick a disc in their computer and watch an HD movie with the included player-software, and wouldn't know about sites like let alone use the software they mention.

RE: ...
By michal1980 on 1/24/2007 7:01:48 AM , Rating: 1
My point was more towards the future. Until movies come with ICT attacks like this will be easier, after ICT you'll need a hdcp card, hdcp cetrified software, and a hdcp monitor... all of which will make the hack harder.

and a bigger problem is still copying the movies to disks so that the chinese can sell them on the black market...
thus blu-ray will still take time to crack to get to the disk market... but like hd-dvd will make it to the internet faster.

As for re-encoding hi-def content... Honestly whats the point? don't people want quality? if you are going to recompress the moive, just get the dvd.

at least with a dvd you can take the mpg2 and move to a more efficent codec. and while alot of blu-rays are still mpg2... hd-dvd is vc1,(ie mpg4) and more blu-rays are going that way... So the only way to make the files smaller is to throw out ALOT of information.

Its like reading a book, first to make it smaller you through out some words and replace with a single number placeholder. Then you take that compressed book, and just through random words out...

Why do people want crappy hi-def? Just stick with sd video then and don't ruin hi-def for everyone else

RE: ...
By michal1980 on 1/24/07, Rating: -1
"Intel is investing heavily (think gazillions of dollars and bazillions of engineering man hours) in resources to create an Intel host controllers spec in order to speed time to market of the USB 3.0 technology." -- Intel blogger Nick Knupffer
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