What good does the Dallas Key do?
If anybody who knows the not-so-secret password can get access to the machine, they can program in their own random Dallas Key, do their dirty work then throw the key away or, better yet, hide it in somebody else's desk and incriminate them.
What's next? A retinal scanner? ![[Roll Eyes]](rolleyes.gif)
Posted by Brad Miller (Member # 2) on 10-02-2012, 12:41 AM:
Its just like the TSA, a false sense of security.
Posted by Dave Macaulay (Member # 813) on 10-02-2012, 07:13 AM:
Whatever the security violation reset process is, it's a "lock the barn door, someone stole the horse" situation.
The primary security task is to prevent encrypted content from being decrypted from the distribution data to play on a non-compliant viewing system, or playing on a compliant viewing system without authorization, or playing on an authorized compliant viewing system without all the secondary security systems working.
The secondary security systems assume a copy has been made, and are there to help track down the source of any copies that are distributed publicly. The video and sound watermarking shows the time the copied show was played and what system played it.
The simplest way to copy a movie is to make a video using a camera capturing the screen image. Anyone can do this at apublic show with some risk of apprehension, but the video and sound quality will be less than excellent. The watermarking will locate where and when it was done but if you got out of the place without getting caught you are pretty much untraceable.
If you have free access to a theatre you can do this in private in an empty room although the watermarking will tell when it happened, so you should prepare a good alibi locating you elsewhere then. You can get 5.1 or 7.1 sound from the projection system quite easily. Video quality will be vastly reduced from the original DCP data but still it's quite nice if done properly. If you have a prologic encoder and a HD camcorder, you can prepare a damned good master copy ready to be burned to Blu-Rays or DVDs that can be on the street within an hour.
Apparently there were DVD copies of some movies made where the source was clearly an screen capture from a digital system, but without watermarking. That suggests someone modified the TI interface board to bypass the watermarking system - so now we get to pay more for the "gore board" tamperproof" interface boards.
If you want the best quality, the projector's internal encryption of the video data going to the light engine is the weakest in the system but that data already has the video watermarking. Plus there's a LOT of data: it in uncompressed at this stage.
I've heard from fairly good source that if you acquired the data from the light engine interface you could decrypt it... but unless you happen to be the NSA it would take a few months (when the movie will already be out on home video) plus the data capture equipment and computers or computer time for decryption that quickly are very expensive.
The data on the distribution drive (all drives are the same, there is no watermarking of drive data to the best of my knowledge) has much more secure encryption - it would take several years to crack with current generally available technology - unless, again, you're the NSA or you have a supercomputer (or a few) and the people with cryptographic skills to approach the problem. However, if you do have those, they probably cost considerably more than any movie's total gross let alone whatever selling pirated copies could get you. Anyone with such resources isn't stupid and wouldn't waste them on cracking movies.
Assuming someone has found a way to get image data out of the light engine or the circuit boards and use it, the secure area tamper reset process requires someone to be at the projector and the projector security logs will show exactly when the reset was done: the CSI team would simply find out who was there at that time... and there'd be the uncomfortable interview at HQ where the evildoer would eventually confess and head for death row.
Posted by Ken Lackner (Member # 1002) on 10-02-2012, 09:42 AM:
Bahahaha! I was wondering if that was all leading up to a point. ![[Big Grin]](biggrin.gif)
Posted by System Notices (Member # 2357) on 10-04-2015, 02:47 AM:
It has been 1096 days since the last post.
Posted by Long Zequn (Member # 9078) on 10-04-2015, 02:47 AM:
hi ,everybody , what model iButton need to clone ? DS1990 or DS1991? may you take some images to me for the iButton ?
Posted by Mike Blakesley (Member # 26) on 10-05-2015, 12:03 AM:
What the #$%& is an iButton?
Posted by Dave Macaulay (Member # 813) on 10-05-2015, 06:48 AM:
Here ya go:
![[Razz]](tongue.gif)