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MuckySpud
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 Posted: Sat Dec 21, 2024 10:51 pm Post subject: How to deal with encrypted values on game start up? |
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| Hey there, I have a game I am trying to mess with and it has encrypted values which offset the raw values every single time the game is restarted. The values appear to be encrypted on game start up then fed into the relevant values. If I find what writes to the address there is no xor as the value has long since been encrypted already. So I was wondering if there is an easy way to deal with this or somehow decrypt the value if I know the raw value already, thanks.
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Game Hacking Dojo
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| Posted: Sun Dec 22, 2024 5:42 am Post subject: |
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One good thing about obfuscated values is that they can't exist from nothing. Deobfuscation requires a full understanding of the assembly language in most cases. If you're interested in learning then you should start with something easier maybe depending on your level.
The concept of variable obfuscation is applying a formula and removing the formula. This means you would have the encryption key and decryption key within the game. Every time the game has to update the displayed value it has to retrieve the original value, update it and give a deobfuscated copy to the display value.
Is there an easy way? No, unless you already know and understand the formula, which is realistically impossible.
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MuckySpud
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| Posted: Sun Dec 22, 2024 7:36 am Post subject: |
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| Game Hacking Dojo wrote: | One good thing about obfuscated values is that they can't exist from nothing. Deobfuscation requires a full understanding of the assembly language in most cases. If you're interested in learning then you should start with something easier maybe depending on your level.
The concept of variable obfuscation is applying a formula and removing the formula. This means you would have the encryption key and decryption key within the game. Every time the game has to update the displayed value it has to retrieve the original value, update it and give a deobfuscated copy to the display value.
Is there an easy way? No, unless you already know and understand the formula, which is realistically impossible. |
Thank you for the reply! I have actually dealt with a few games with obfuscated values already with backtracing them to the point before they are encrypted and injecting any required code while the raw value is still displayed. This game im working on has a different approach however, maybe I didnt explain it well enough on my original post so let me further break down the issue.
In games I have messed with in the past with encrypted values they happen each time the value is generated which could be when you load a level, when your character dies, or picks up a new weapon etc. This makes it easier to break and trace specific requirements and track down where the raw value is displayed. However, in this game the value is only ever encrypted one single time and seemingly on game start up. This encrypted value is then used throughout the game for the entire session until the game is closed and restarted.
Lets say the raw value I am looking for is 10, when I boot up the game it may make the value 12345678. This value never changes again and will always represent the original raw value in game. The next time I start the game this value may now be 87654321 for example. So I am dealing with a value which is obfuscated one single time and was wondering how to deal with this as my traditional methods wouldnt be effective here, thanks!
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Game Hacking Dojo
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| Posted: Sun Dec 22, 2024 12:18 pm Post subject: |
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Clearer now.
But how did you get this information about it?
Does the display value change or is the value already a static value during game sessions and never changes, like an ID or something?
If the value changes and it shows you the changes accordingly at the end of the game, then the display value is most likely a sum of multiple values.
I'm still guessing because I don't know if the value changes at all. Because I'm assuming if the value is static and you have this much information about it you should've found it, by now.
And what is this game called? And what value is this?
Let me know.
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