[Guess Who]

In another topic, because of odd occurences happening, we wondered if the ROM in Sega Smash Pack 2 of Sonic 2 is the same as S2F or an extremely late prototype. Rika was kind enough to post the ROM in the topic. Unfortunatly, it is under some extreme encryption. I am looking for some aid in cracking the encryption and finding out.

Will anyone help me?
The rom will be up soon. For now, go to General Sonic Games Discussion and download it from the topic "Oddities in Sonic 2 PC and in general", page 2.

This post has been edited by guess_who: 30 December 2003 - 12:55 PM

[Hivebrain]

It's encrypted, not compressed. The filesize is exactly that of the *.BIN file.

[Rika Chou]

Hivebrain, on Dec 30 2003, 01:26 AM, said:

It's encrypted, not compressed. The filesize is exactly that of the *.BIN file.

Yeah, when I said that in the other topic I was going by my memory, at the time I hadn't actually looked at the ROM.

Here is that particular ROM.

[Hivebrain]

I just checked, and the *.KVQ is 8 bytes larger than the *.BIN.

[fuzzbuzz]

Ooh, a challenge. I'm going to work on it right away...=)

Most likely, though, the encryption has a key, figuring out that key will be the hard part...

EDIT: Could someone post the ISO, at least just the executable, just in case?


Fuzzbuzz

This post has been edited by fuzzbuzz: 30 December 2003 - 12:26 AM

[Rika Chou]

fuzzbuzz, on Dec 30 2003, 03:25 AM, said:

Ooh, a challenge.  I'm going to work on it right away...=)

Most likely, though, the encryption has a key, figuring out that key will be the hard part...

EDIT: Could someone post the ISO, at least just the executable, just in case?


Fuzzbuzz

I dun feel like looking for my disk to make an ISO, but here is my entire smash pack folder that contains the program:
Smash Pack II

This post has been edited by Rika Chou: 30 December 2003 - 01:00 AM

[Quickman]

It will doubtless be a non-symmetrical cypher, and those are very difficult indeed to crack.

[fuzzbuzz]

Quote

I dun feel like looking for my disk to make an ISO, but here is my entire smash pack folder that contains the program:
Smash Pack II

Sweet! Now I've got my entire week planned...:P

Now the hard part, figuring out which encryption it is. But, maybe it uses huffman encoding...


Fuzzbuzz

This post has been edited by fuzzbuzz: 30 December 2003 - 01:21 AM

[LOst]

Is this smash pack for the PC? Then I will probably decrypt it easy :P

[XFox Prower]

I'll also take this challenge. If anyone still needs the whole CD as an ISO, I can send it to you on aim. I've broken password systems in games and cracked save files so I might come up with something.

[Guess Who]

Speaking of which, what are some good utilities to make ISOs with?
And yes, it is Smash Pack 2 for PC. I also corrected my post to say 'encryption'.

This post has been edited by guess_who: 30 December 2003 - 03:11 PM

[LOst]

Done, here you go:

Decrypted version of Sonic II.kvq:
http://logotypes.se/...stsm2sonic2.rar

[fuzzbuzz]

Damn! you beat me! I shouldn't have spent the morning playing SADX:PC! :P

EDIT: If I may ask, what encryption was it exactly? Was there a needed key?


Fuzbuzz

This post has been edited by fuzzbuzz: 30 December 2003 - 06:01 PM

[XFox Prower]

Interesting. It looks similar for the most part. But the conversion was 2 mb. The cart and the kvq file were 1 mb. There was 1 mb of trailing 00h With or without the trailing 0s, the rom renders a red screen in Gens. Doing a file compare now.

EDIT:

Sonic 2 dump (from Sonic Strike)
0x300: 4A 79 00 C0 00 04 32 39 00 C0 00 04 00 01 00 01

decrypted from Smash Pack II by LOst:
0x300: 8(4E 71)
(repeat 8 times across the row alternating between 4E and 71)

All offsets above 0x300 are identical.

This post has been edited by XFoxPrower: 30 December 2003 - 08:57 PM

[Guess Who]

Alright! Man, it's no different... so much for "Oddities in Sonic 2 PC, and in general"...