sasuga, noob-chan.js

caesar(atob('TFdWIFFSVyBEUSBEVlZEVlZMUSwgTFdWIEQgUUxRTUQ7IFFSVyBZRFBTTFVILVJRSCwgV0tSWEpLLg=='), 23);
function caesar(s, n) {
    n = n || 13;
    var alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
    return s.toUpperCase().replace(/./g, function(l) {
        var index = alphabet.indexOf(l);
        return index < 0 ? l : alphabet[(index + n) % 26];
    });
}