Hiding perl script.

Raj D. — Sun, 20 Jun 2004 05:31:49 GMT

Hi All ,

Is there any way to hide to perl source code program , so that no one can see the source program.

if i do

# cat secret.p
it shows the script

Thanks in Advance ..

Regards ,
Raj. D.
--------

Re: Hiding perl script.

Raj D. — Sun, 20 Jun 2004 06:30:59 GMT

Is there any encryption method available ....

And it has to be executable one .

Re: Hiding perl script.

H.Merijn Brand (procura — Sun, 20 Jun 2004 07:36:01 GMT

Short answer: No

Medium answer: man perlcc

Long answer: Only hidable to the people that do not know Perl, because Perl has a very good way of showing the code, even if it is pre-compiled, by decomposing the internal structures, so using Perl's native ways of hiding the source code, you won't be able to, and you should not want to be able to

A better way for what you want is make a very small C program that uses a customized crypt/decrypt method to read encrypted perl scripts, and feeds it (internally) to perl.

/My/ opinion: Perl sources should always be readable, since whatever way you try to hide it will only encourage people like me to find ways to decrypt it, just because Perl is not designed to be hidden.

Very long answer:
--8<---
# perldoc -q 'How can I hide the source for my Perl program?'
Found in /pro/lib/perl5/5.8.3/pod/perlfaq3.pod
How can I hide the source for my Perl program?

Delete it. :-) Seriously, there are a number of (mostly
unsatisfactory) solutions with varying levels of ``secuï¿½
rity''.

First of all, however, you can't take away read permisï¿½
sion, because the source code has to be readable in order
to be compiled and interpreted. (That doesn't mean that a
CGI script's source is readable by people on the web,
though--only by people with access to the filesystem.) So
you have to leave the permissions at the socially friendly
0755 level.

Some people regard this as a security problem. If your
program does insecure things and relies on people not
knowing how to exploit those insecurities, it is not
secure. It is often possible for someone to determine the
insecure things and exploit them without viewing the
source. Security through obscurity, the name for hiding
your bugs instead of fixing them, is little security
indeed.

You can try using encryption via source filters (Starting
from Perl 5.8 the Filter::Simple and Filter::Util::Call
modules are included in the standard distribution), but
any decent programmer will be able to decrypt it. You can
try using the byte code compiler and interpreter described
below, but the curious might still be able to de-compile
it. You can try using the native-code compiler described
below, but crackers might be able to disassemble it.
These pose varying degrees of difficulty to people wanting
to get at your code, but none can definitively conceal it
(true of every language, not just Perl).

It is very easy to recover the source of Perl programs.
You simply feed the program to the perl interpreter and
use the modules in the B:: hierarchy. The B::Deparse modï¿½
ule should be able to defeat most attempts to hide source.
Again, this is not unique to Perl.

If you're concerned about people profiting from your code,
then the bottom line is that nothing but a restrictive
license will give you legal security. License your softï¿½
ware and pepper it with threatening statements like ``This
is unpublished proprietary software of XYZ Corp. Your
access to it does not give you permission to use it blah
blah blah.'' We are not lawyers, of course, so you should
see a lawyer if you want to be sure your license's wording
will stand up in court.
-->8---

Enjoy, Have F

Re: Hiding perl script.

rveri — Sun, 20 Jun 2004 07:53:59 GMT

Such a beautiful explanation clears the fact.
And its going very deep.

Thanks procura. Thanks i got it.
10 points to you.

Regards ,

RVeri.

Re: Hiding perl script.

R. Sri Ram Kishore_1 — Wed, 23 Jun 2004 01:27:43 GMT

Hi Raj,

Please assign those 10 points you want to give.

Regards,
Sri Ram

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