At 03:16 PM 11/16/98 -0000, you wrote:
>Hi Matt,
>
> >The Encryption does not have to cover the entire cart. A Byte in the
top of
> >the cart indicates what portion of the cart to use to generate the
> >encryption check. it can be as little as 4K....
> >....Harry Dodgson's monitor cart (believe it or not, I
> >got one of these from cart hunting in the wild) only "encrypts" the top 4K
> >and the vectors immediately jump out to point in the "unencrypted" space.
I have been doing a bit of code tracing regarding this encryption. I have
read the web pages that state that reverse engineering the encryption
scheme is nearly impossible. But, call me a fool, I still hold out hope :)
I want to get a handle on this encryption scheme to determine for certain
if it is reversable. If it is determined that it is reversable, then I
want to continue to attempt to write the inverse function to the decryption
function. Does everyone think I'm nuts? Wasting my time? Here are my plans:
1) Rewrite the decryption code in C.
2) Analyze what the decryption code is doing.
3) Write the inverse function.
This may be a project that needs a group effort, and I would love to work
together with anybody who feels that they can contribute to this!
Bob
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