var randomness = 500

function rand(maximum, minimum) {
    return Math.floor(Math.random() * (maximum - minimum) + minimum)
}

function encode(code) {
    var offset = rand(1, randomness)
    var finish = offset + ":"
    for (var character = 0; character < code.length; character++) {
        finish += (code.charCodeAt(character, character) + offset) + ":"
    }
    return finish
}

function decode(code) {

}

var code = encode("hello")