Comments on: Anatomy of an Optical Medium Authentication (Part 1)

By: shuffle2

shuffle2 — Mon, 14 Jun 2010 17:49:05 +0000

perhaps you could remake the dvd.png so it’s viewable on your new(ish) theme :)

By: tmbinc

tmbinc — Fri, 29 Jan 2010 13:11:45 +0000

I totally agree. As a matter of fact, I *am* working on it, still.

Let me conclude that the second part will be much more boring that you might think. And for the third part, I’m still missing some equipment.

dasda: Could you provide an (optical :) image of this disc?

By: i2c

i2c — Fri, 29 Jan 2010 12:14:52 +0000

I agree with Busing that I’d like to see this article finished.

By: bushing

bushing — Sat, 28 Nov 2009 02:42:23 +0000

Please finish this.

Love,
Bushing

By: Count Zero

Count Zero — Thu, 08 Oct 2009 22:13:20 +0000

Excellent article indeed!

By: dasda

dasda — Thu, 26 Feb 2009 21:17:27 +0000

Very interesting, thanks!
I have a old Action Replay demo-disc (got it from a magazine) from Datel, it has some strange holes on the disc where those six marks are located in your image.

By: Eric Ball

Eric Ball — Mon, 02 Feb 2009 18:31:57 +0000

When the Gamecube was first introduced, there was some speculation that the drive spun the discs backwards from a standard CD/DVD player. This was quickly disproven, but I wonder whether reverse spinning would have made piracy (i.e. copying via consumer DVD-Rs) more difficult. (Although it probably wouldn’t have prevented counterfeitting – but almost anything can be duplicated given enough time, money, and effort.)

By: so_what

so_what — Sun, 11 Jan 2009 15:09:23 +0000

hi,

i’ve just seen the ccc stream where you talk about the xbox360 hypervisor exploit and now im wondering how you guys managed to get the hypervisor code itself and not encrypted

By: dasda

dasda — Sun, 28 Dec 2008 11:24:12 +0000

Looking forward to part 2! :)

By: Nate

Nate — Tue, 02 Dec 2008 01:46:13 +0000

Very nice article. The best C64 floppy protection schemes used a combination of similar properties: non-standard encoding, obfuscation, and sector angular alignment. RapidLok was one protection that did all these. Also, the skew timing test is done on the Xbox360 discs. Based on your analysis of the Datel disc, it sounds like no one checked the analog properties to be sure the threshold of detection was sharp enough. Quite intriguing. Thanks!