A challenge for the expert hackers.

Guess Who · Dec 30, 2003

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.

Hivebrain · Dec 30, 2003

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

Rika Chou · Dec 30, 2003

Hivebrain said:

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

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 · Dec 30, 2003

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

fuzzbuzz · Dec 30, 2003

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

Rika Chou · Dec 30, 2003

fuzzbuzz 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
Click to expand...

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

Quickman · Dec 30, 2003

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

fuzzbuzz · Dec 30, 2003

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
Click to expand...

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

LOst · Dec 30, 2003

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

XFox Prower · Dec 30, 2003

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 · Dec 30, 2003

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'.

LOst · Dec 30, 2003

Done, here you go:

Decrypted version of Sonic II.kvq:
http://logotypes.se/sonic/LOstsm2sonic2.rar

fuzzbuzz · Dec 30, 2003

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

XFox Prower · Dec 31, 2003

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.

Guess Who · Dec 31, 2003

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

LOst · Dec 31, 2003

fuzzbuzz said:

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
Click to expand...

Encryption key? No, I haven't even touched the kvq file. I let the program decrypt it for me :P

Guess Who · Dec 31, 2003

Which program? I use WinHex to look at hex and so forth, and it has no option to decrypt.

fuzzbuzz · Dec 31, 2003

I think he meant Smash Pack 2, and did a memory dump. However, I'm still curious what encryption it was....I still have something to do! :P

Though, I'd still rather play SADX PC. What fun.

Fuzzbuzz

Guess Who · Dec 31, 2003

It takes forever to download SADX PC for me... wah. Not only that, I don't have 3d support on my PC.... wah wah wah wah! *shot* *shot* *shot* *shot*

*shot*

fuzzbuzz · Dec 31, 2003

If you wanna DL it: use my ftp "server":

ftp://scarz:[email protected]/

Fuzzbuzz

A challenge for the expert hackers.

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