About Encryption

I've written a lot of Autolisp programs and I want to know how to encrypt Autolisp programs so that others can't directly view them in text editors or even modify them with malice.

 

I have a Kelv program that encrypts lsp programs - this is the original
program for this operation. Takes a bit of explanation which is not
something for this forum. If you want, can send to you via email with
full explanation.
W.

 

use protect.exe provide by autodesk u can protect your lisp routine



wjtpt <> wrote in message news:...

I've written a lot of Autolisp programs and I want to know how to encrypt Autolisp programs so that others can't directly view them in text editors or even modify them with malice.

 

If you have release 2000 or higher, use the vlide-editor (visualLisp editor in acad) and create FAS-files. This give a secure encryption to your applications.
--
Jeroen Berkers
A2k - W98SE



"wjtpt" <> wrote in message news:...

I've written a lot of Autolisp programs and I want to know how to encrypt Autolisp programs so that others can't directly view them in text editors or even modify them with malice.

 

Hello,

In AutoCAD 2000 and above, you can use Visual Lisp to complile your
programs into an FAS file or VLX application. This is a binary file and
cannot be viewed or changed.

Regards
Rakesh

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</PRE>

 

Unfortunately there are many programs to unprotect these around.

--

Regards,

Ian A. White, CPEng

WAI Engineering
Sydney 2000
Australia

Ph: +61 418 203 229
Fax: +61 2 9622 0450
Home Page: www.wai.com.au

 

Even FAS files are not safe. A while back someone passed me a routine
to decrypt them, and unfortunately it gave me back the source code very
clearly.

KELV.EXE is good as it takes a very long time to re-assemble anything
that you can use. There are cautions here, and the key is an updated
KELV.DEF file. The last one I had was for R14. For any routine written
with 2000 and later you will need it updated to take care of all the VL,
VLA, VLAX, VLR functions otherwise they will be scrambled and you will
not be able to run the routine.

--

Regards,

Ian A. White, CPEng

WAI Engineering
Sydney 2000
Australia

Ph: +61 418 203 229
Fax: +61 2 9622 0450
Home Page: www.wai.com.au

 

Ian is the encryption with doslib a good one ?

 

Those are still not binary files. They are byte-encoded very similarly
to how protect did the old "autolisp protected" files. And as such, can
be decrypted. The only fortunate thing right now is that there isn't a
program to decrypt these files that's easy to get ahold of. There is
one out there being worked on and I've seen probably the same program
Ian has only at a much earlier stage.

Learning VC++ and programming your applications in ARX is the only true
way to protect your code.

 

Probably as good as any, but I don't think it works with AutoLISP files
on the fly. I understand it encrypts the drawing file as a security
measure (at least when I tried it a while back).

The problem with PROTECT is that no matter what the "password/key" you
use, only the first letter is used, and all you have to do is list the
protected file and it stares you in the face.

--

Regards,

Ian A. White, CPEng

WAI Engineering
Sydney 2000
Australia

Ph: +61 418 203 229
Fax: +61 2 9622 0450
Home Page: www.wai.com.au

 

You don't even need to do that as any (or most) of the decrypt programs out
there will just do that itself and decrypt the file in just a couple of
seconds.