jrot

is characters rotation and you can customaise it

exaampel

``js
const Jrot = require('jrot');

var rot13 = new Jrot({
data : new Jrot.JData([1,9], ["a","Z"]),
rc : 13
})
var str = "some string";

var estr = rot13.encode(str);
var dstr = rot13.decode(estr);

console.log(str === dstr); // true
``