How-to-Encrypt-a-shell-script

If you’re really concerning about the privacy of your shell scripts(Source),

I have use Ubuntu 14.04 server with the root Privilage. The source of the program 'SCH' which I’m using here is from

    http://www.datsi.fi.upm.es/

At first lets download some packeges which required to run our shell encryption program

You will need to download gcc compilers

    root@ubuntu:/usr/src# apt-get install gcc

You will need to install 'make' utility if it required (Depend on your system)

    root@ubuntu:/usr/src# apt-get install make

After that lets download our encryption program/ source [from http://www.datsi.fi.upm.es/~frosal/sources/]

Or you can download the 'SCH' source file which I've attached to this repository from from http://www.datsi.fi.upm.es/~frosal/sources/

    root@ubuntu:/usr/src# wget http://www.datsi.fi.upm.es/~frosal/sources/shc-3.8.9b.tgz

Lets extract the '.tgz' file

    root@ubuntu:/usr/src# tar xvf shc-3.8.7.tgz
    shc-3.8.7/CHANGES
    shc-3.8.7/Copying
    shc-3.8.7/Makefile
    shc-3.8.7/match
    shc-3.8.7/pru.sh
    shc-3.8.7/shc-3.8.7.c
    shc-3.8.7/shc.1
    shc-3.8.7/shc.README
    shc-3.8.7/shc.c
    shc-3.8.7/shc.html
    shc-3.8.7/test.bash
    shc-3.8.7/test.csh
    shc-3.8.7/test.ksh

Let jump in to the 'shc' source folder

    root@ubuntu:/usr/src# cd shc-3.8.7

In here I'm going to encrypt a shell script in the

    /home/encrypt

Let's look inside the Shell script

    vim /home/encrypt/checksrv.sh

Now lets Encrypt our Shell file Note that you always welcome to change password file in the shc-3.8.7 as you desire.

    root@ubuntu:/usr/src/shc-3.8.7# ./shc -f /home/encrypt/checksrv.sh

There will be two additional files

    root@ubuntu:/usr/src/shc-3.8.7# ls  /home/encrypt/
    checksrv.sh  checksrv.sh.x  checksrv.sh.x.c

'checksrv.sh' is our original (Unencrypted) shell source 'checksrv.sh.x' is the Encrypted Shell source 'checksrv.sh.x.c' c files was created in order to perform encryption

Lets check on our encrypted source file

    root@ubuntu:/usr/src/shc-3.8.7# vim  /home/encrypt/checksrv.sh.x

Now you can see some binary stuffs instead of the plain shell text.

Now you can share the '.sh.x' so your source will be hidden