42 lines
2.0 KiB
Plaintext
42 lines
2.0 KiB
Plaintext
Another fine Crack From -TOP-
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TOP is Tired of Protection how about you?
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Unprotect for STARCON2!
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****************************************
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AAUGH! Horribly good documentation check
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****************************************
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Use the enclosed loader star.exe
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The method involved:
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This is one of the toughest cracks I have ever looked at. I
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found the documentation check easily enough and also the compare but
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this did not crack the game. I found that the game kept encrypting and
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decrypting the answers and if you interrupted this process by an early
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crack then the program would fold up on you. A byte crack is not
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possible (by me at least) due to the encryption. So I went to a loader.
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The loader did not work because these guys who programmed it duplicated
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all the important interrupts and never gave control back to the original
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DOS interrupt. AAUGH!
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I took a look at the vectors of the interrupts (VECS command)
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and noted that INT 21 was not grabbed (would have been almost impossible
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for them to do). I grabbed the interrupt and used it to grab INT 8
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(system timer--pops up 16.8 times a second or something like that) after
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they grabbed it. So now I had a hook into the program. Since the timer
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is always popping up I had to have a way to orient myself in memory. I
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knew that the inputted code would end up in a certain area so I checked
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this area for a simple code 'TOP'. I then knew I was in a good area of
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the code to do my work. I scanned through the partially encryted code
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and compared it to my saved code in my loader (that's why it's so big).
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The starcon2 code starts its encryption right at the answer. Since I
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already had the answer in my code I used it and copied it into the
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answer section. So you will note that as soon as you press the enter
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key after 'TOP' the right answer pops in and so does not disturb the
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flow of the program. I hope you enjoy this one.
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The Mad Doctor
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-TOP- crack.
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