Linux two way password encryption?

I am looking for a way to encrypt the password for my perl script.

The password is stored in an XML file called config.xml

I have tried before to come up with a way to encrypt the password using various perl modules.

But I keep running into the same problem, decrypting the password.

The problem is either once the password is encrypted I can never get to it again, like it works with crypt. Or the other problem being I have to include in the other开发者_StackOverflow中文版 script the function to decrypt the password. Therefore making the encrpytion pointless in the first place.

So I got to thinking, what if I use a Linux application instead of a perl module.

So my question pretty much boils down to this,

Is there any application I can install for Debian/Ubuntu that will give me two password encryption that I can use in my perl script?

I must have a way to decrypt the password as it is needed for the SSH connection to the server.

Use ssh-keys instead of a password.