Re: decompiling class files
Arne VajhHj wrote:
Aryeh M. Friedman wrote:
I was thinking of using some form of public key system to encrypt the
code the license server or what ever fetches either the public or
private key (for this purpose they are interchangeable) from a server
in order to make the code executable.... now no amount of this will
prevent someone from say hooking a logic anaylizer up to the address
and data buses and decoding the instruction cycle... but short of
that I want to make it hard
If your program is to be run as a normal Java program, then the
startup code need to be standard Java byte code. The rest of the code
need to be decrypted to standard Java byte code by the starup code
for it to run.
So the bad guys decompile the startup code, modifies it to save a copy
of the decrypted byte code on disk. Which can then be decompiled and
all license and integrity checks be removed.
I presume that it wouldn't be hard to take an open-source JVM (of which
there are many) and modify it to save a loaded class's bytecode to disk.
Run the result through your hand-dandy decompiler, and Bob's your uncle.
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