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A challenge for the expert hackers.

Discussion in 'Engineering & Reverse Engineering' started by Guess Who, Dec 30, 2003.

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  1. Guess Who

    Guess Who

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    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.
     
  2. Hivebrain

    Hivebrain

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

    Rika Chou

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    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.
     
  4. Hivebrain

    Hivebrain

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

    fuzzbuzz

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    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
     
  6. Rika Chou

    Rika Chou

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    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
     
  7. Quickman

    Quickman

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

    fuzzbuzz

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    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
     
  9. LOst

    LOst

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

    XFox Prower

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    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. :(
     
  11. Guess Who

    Guess Who

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    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'.
     
  12. LOst

    LOst

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  13. fuzzbuzz

    fuzzbuzz

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    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
     
  14. XFox Prower

    XFox Prower

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    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.
     
  15. Guess Who

    Guess Who

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

    LOst

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

    Guess Who

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

    fuzzbuzz

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    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
     
  19. Guess Who

    Guess Who

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    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*
     
  20. fuzzbuzz

    fuzzbuzz

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