Redfox (AnyDVD et all) appears to be gone

[Kju]

Originally Posted by magician

Since first coming across this forum I have always relied on BlurayTestAndDecrypt (aka BTAD) to test my protected ISO rips for issues due to disc errors, write corruption, bit flips, and other likely or unlikely causes. Thus far I believe it has never failed to identify a broken rip. Nevertheless, it is great to have available another easily accessible tool like Xreveal's Content Hash Verifier to do verification of encrypted units on Blu-rays, despite neither one being open source.

I usually use mode 2 "advanced test" or mode 6/7 "dump and test" of BTAD. I don't know if that does the same thing as the Xreveal utility but I know it's still early days for the latter and there may still be some bugs in there. So I very much support the work to build another tool with the potential to open source it later. Maybe one of you can reach out to @nalor for input since they seem to be quite familiar with these algorithms.

BlurayTestAndDecrypt works differently. I think it checks if the Sync Bytes of the Transport Stream Header are correctly set (every 192th byte). It doesn't validates the files against the Hashtable. I don't think it can reliably detect bit flips, because how AES-CBC decryption works. A changed Bit only changes a maximum of 32 Bytes in the decryption result. (16 Byte decryption, 16 Byte Xor) But it should detect sector errors, if the complete sector contains garbage. And I think this is the most common error.

Originally Posted by Shinobi

Awesome you've seemingly figured this out as well! Congrats!

I'm very much looking forward to reading your source code once it's finished!

Yeah, took me way to long. I shouldn't look at hexdumps with a bottle of beer. It only took so long because I always overlooked adding 4 Bytes from the beginning when calculating the crc.

[Shinobi]

Originally Posted by Kju

Yeah, took me way to long. I shouldn't look at hexdumps with a bottle of beer. It only took so long because I always overlooked adding 4 Bytes from the beginning when calculating the crc.

It's always these little things / oversights that take ages to puzzle out ...

But if it makes you feel better: I probably wouldn't have figured out that CRC thing at all (or at least not that fast) even though I never drink at all.

[nalor]

Originally Posted by Kju

BlurayTestAndDecrypt works differently. I think it checks if the Sync Bytes of the Transport Stream Header are correctly set (every 192th byte). It doesn't validates the files against the Hashtable. I don't think it can reliably detect bit flips, because how AES-CBC decryption works. A changed Bit only changes a maximum of 32 Bytes in the decryption result. (16 Byte decryption, 16 Byte Xor) But it should detect sector errors, if the complete sector contains garbage. And I think this is the most common error.



Yeah, took me way to long. I shouldn't look at hexdumps with a bottle of beer. It only took so long because I always overlooked adding 4 Bytes from the beginning when calculating the crc.

But I started thinking and maybe I'll add the hashtable validation in addition (wasn't aware of this hashtable until the discussion here started )

[Kju]

Originally Posted by nalor

But I started thinking and maybe I'll add the hashtable validation in addition (wasn't aware of this hashtable until the discussion here started )

That would be cool!


I'll need a bit more time to release my implementation. It's only a side project for fun and I have a few other more important tasks currently.

[rco133]

Hi.

Anyone know if Xreveal will also remove region lock on UHD discs?

AnyDVD didn't do that per default, but had a regkey that needed to be set for it to do it.

Yes, I know that UHD discs are not supposed to have region lock. But never the less there are quite a few discs in the wild, where studios by mistake, or for whatever reason, have made UHD discs with region lock.

Thanks in advance

rco133

[jayper]

Originally Posted by rco133

Hi.

Anyone know if Xreveal will also remove region lock on UHD discs?

AnyDVD didn't do that per default, but had a regkey that needed to be set for it to do it.

Yes, I know that UHD discs are not supposed to have region lock. But never the less there are quite a few discs in the wild, where studios by mistake, or for whatever reason, have made UHD discs with region lock.

Thanks in advance

rco133

This was added in version 2.6.8: https://www.xreveal.com/news?id=81

[Shinobi]

Jeez, where has all the discussion gone in this thread?

Originally Posted by Kju

I'll need a bit more time to release my implementation. It's only a side project for fun and I have a few other more important tasks currently.

Same with me when I'm doing a programming project.
Do take your time, real life always comes first!

[SamuriHL]

Nothing more to this story. They're gone. And unlike all the stupid predictions they didn't come back under a new name and charge everyone more. They're gone.

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