Re: Figuring out table based encryption in assembly

"jonathon" <spamtrap@xxxxxxxxxx> wrote in message
news:1127575250.637182.199810@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> I've been tracing an old (1996) utility that uses a very sophisticated
> encryption algorithm for license info. It generates a table, uses
> constantly changing keys, and does some really bizarre stuff with
> multiplication, shifts, xor, and table lookups.
>
> The crypto group doesn't seem to be very active or very helpful, so I
> thought I'd ask here: is there any way to figure out if this is a
> standard encryption method?
>
> It's so complex, it seems unlikely some guy in his garage made it up.
> But at the same time, I'm not sure how to tell if it is DES, Blowfish,
> or something similar.

Try PEiD (http://peid.has.it/). Its a great tool for finding out stuff about
binaries.
Amongst other things it has a plugin that can find signatures of most crypto
algorithms.
and tell you which algorithms an EXE file is using.



.

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