I am looking for an encryption method similar to Base64 (in that it can be decrypted and encrypted [2 way encryption method]). It doesn't have to be super secure just not super-well known
If you don't want one that is super-well known then you can always create your own. You can make it as secure as you want it, just look up creating your own encryption methods.
Is the script in 1 file or spread across several? Like QW says just create your own. Also stuff like this.