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HD-DVD, BluRay DRM Further Compromised
Processing key uncovered....
by Karl Bode 12:09PM Tuesday Feb 13 2007 Tipped by MxxCon See Profile
Engadget notes that DRM hacker 'arnezami' over at the Doom9 forums has found the "processing key" used to decrypt the DRM on all HD DVD and Blu-ray Disc films. "Let's break this down for what it is: instead of needing individual keys for each and every high-definition film -- of which there are many -- the processing key can be used to unlock, decrypt, and backup every HD-DVD and Blu-ray Disc film released so far." The war on keeping pirated HD content out of the hands of broadband users isn't going very well so far -- the only thing holding back increased HD piracy is bandwidth.


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phantom6294

join:2002-02-27
Abingdon, MD

3 recommendations

reply to texans20

Re: I Don't understand encryption

The easiest way to think of encryption is to think of it as a math equation.

Take y=x*2.

In this example:
- x is the information we want to encrypt,
- y is the encrypted information
- *2 'encryption algorithm.'

So, if I needed to send you the number 5 --> y=5*2 --> y=10. Obviously, to decrypt the message, you simply use the equation x=y/2 --> x=10/2 --> x=5.

In this example, if the hacker doesn't know the encryption method, we are safe. However, once he figures out we are simply multiplying by two, the hacker has cracked our encryption scheme. As such, the hacker would be attacking the encryption scheme. Needless to say, this method of encryption isn't very secure. So, we can make it slightly harder by changing the encryption equation to:

y=x*c
- x is the information we want to encrypt
- y is the encrypted information
- multiplication is the encryption algorithm
- c is the password (or key)

This method is more robust because we can change the value of c each time we send information. Obviously, we have to agree upon what c will be before hand. In this example, the hacker can figure out our encryption scheme (multiplication) but that knowledge is useless to him if he doesn't know what c is. However, depending on how large a number c is, it may not take long for the hacker to simply correctly guess what c is. In this case, the hacker would be attacking the encryption key.

In the real world, the encryption algorithms are more complex and the keys (passwords) are also much more complex, but the basic principle should hold true. Most encryption algorithms are open so that anyone can critique them and ensure there isn't a fundamental flaw in the algorithm. A flawed encryption algorithm would be one where simply having the knowledge of the algorithm would allow the hacker to crack the information.

Since most encryption algorithms in use today are very robust, hackers attack the keys (passwords) that are used to encrypt the information. As I understand it, this is what happened in this news story. The keys used to encrypt the content on the HD-DVDs and Blueray Discs has been discovered, which should allow anyone to decrypt the information.

Hope this helps.


exocet_cm
Free at last, free at last
Premium
join:2003-03-23
New Orleans, LA
kudos:3

2 recommendations

reply to dadkins

Re: YAY!

said by dadkins:

So, where's my AnyBD driver?

Still though, at 25-50GB per movie... freakin HUGE ass files!
This is why I am greatful for the available access to bonded T1s near my area.
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