Introduction
Developers don’t always have time to setup a backend service when prototyping code. Storing credentials on the client side should be fine as long as it’s obfuscated right?
Source code
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< html >
< head >
< title > Login Panel</ title >
< link rel = "stylesheet" href = "https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.3/css/bootstrap.min.css" integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin = "anonymous" >
</ head >
< body >
< div class = "container h-100" >
< div class = "row h-100 justify-content-center align-items-center" >
< div class = "col-6" >
< form id = "login" >
< div class = "form-group" >
< input class = "form-control text-center" id = "username" name = "username" placeholder = "USERNAME" type = "text" value = "" >
</ div >
< div class = "form-group" >
< input class = "form-control text-center" id = "password" name = "password" placeholder = "PASSWORD" type = "password" value = "" >
</ div >
< button type = "submit" class = "btn btn-primary btn-block" > SUBMIT</ button >
</ form >
</ div >
</ div >
</ div >
< script >
window . onload = function () {
document . getElementById ( 'login' ). onsubmit = function () {
[][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]][([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([][[]] + [])[ + []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ +!+ []]](([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ + []] + ( + [ ! []] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ +!+ []]] + ( ! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ !+ [] +!+ [] + [ + []]] + ( !! [] + [])[ + []] + ( + ( +!+ [] + [ + []] + [ +!+ []]))[( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( +! [] + ([] + [])[([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([][[]] + [])[ + []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( +! [] + [ ! []] + ([] + [])[([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([][[]] + [])[ + []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ +!+ []]])[ !+ [] +!+ [] + [ + []]]]( !+ [] +!+ [] + [ +!+ []])[ +!+ []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ( + ( +!+ [] + [ +!+ []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + [ !+ [] +!+ []] + [ + []]) + [])[ +!+ []] + ([][[]] + [])[ + []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []] + ([][[]] + [])[ +!+ []] + ( ! [] + [])[ +!+ []] + (( + [])[([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([][[]] + [])[ + []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ +!+ []]] + [])[ +!+ [] + [ +!+ []]] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( + ( +!+ [] + [ +!+ []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + [ !+ [] +!+ []] + [ + []]) + [])[ +!+ []] + ( + ( !+ [] +!+ [] +!+ [] + [ +!+ []]))[( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( +! [] + ([] + [])[([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([][[]] + [])[ + []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( +! [] + [ ! []] + ([] + [])[([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([][[]] + [])[ + []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ +!+ []]])[ !+ [] +!+ [] + [ + []]]]( !+ [] +!+ [] +!+ [] + [ !+ [] +!+ []]) + ( ! [] + [])[ +!+ []] + ( ! [] + [])[ !+ [] +!+ []] + ([][[]] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( + [ ! []] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ +!+ []]] + ([] + [])[( ! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( !! [] + [])[ + []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ +!+ []]]()[ +!+ [] + [ +!+ []]] + ([] + [])[( ! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( !! [] + [])[ + []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ +!+ []]]()[ +!+ [] + [ +!+ []]] + ( + [ ! []] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ +!+ []]] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]][([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([][[]] + [])[ + []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ +!+ []]](( !! [] + [])[ +!+ []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ([][[]] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([][[]] + [])[ +!+ []] + ( + [ ! []] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ +!+ []]] + ([][[]] + [])[ + []] + ([][[]] + [])[ +!+ []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( ! [] + [])[ +!+ []] + ( + ( !+ [] +!+ [] + [ +!+ []] + [ +!+ []]))[( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( +! [] + ([] + [])[([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([][[]] + [])[ + []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( +! [] + [ ! []] + ([] + [])[([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! 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[] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( ! [] + [])[ +!+ []] + ( + ( !+ [] +!+ [] + [ +!+ []] + [ +!+ []]))[( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( +! [] + ([] + [])[([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([][[]] + [])[ + []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! 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[] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []]]()[ + []])[ + []] + ( !+ [] +!+ [] + [ !+ [] +!+ [] +!+ [] +!+ [] +!+ [] +!+ [] +!+ []]) + []) + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ !+ [] +!+ [] + [ + []]] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]][([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! 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[] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( +! [] + [ ! []] + ([] + [])[([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([][[]] + [])[ + []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ +!+ []]])[ !+ [] +!+ [] + [ + []]]]( !+ [] +!+ [] +!+ [] + [ +!+ []])[ +!+ []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []])()(([] + [])[([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( !! [] + [])[ + []] + ( ! [] + [])[ +!+ []] + ( ! [] + [])[ !+ [] +!+ []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []]]()[ + []])[ + []] + [ !+ [] +!+ [] +!+ []] + ( + ( +!+ [] + [ +!+ []]))[( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( +! [] + ([] + [])[([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! 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[] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ +!+ []]](( !! [] + [])[ +!+ []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ([][[]] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([][[]] + [])[ +!+ []] + ( + [ ! []] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ +!+ []]] + ([][[]] + [])[ + []] + ([][[]] + [])[ +!+ []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( ! [] + [])[ +!+ []] + ( + ( !+ [] +!+ [] + [ +!+ []] + [ +!+ []]))[( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( +! [] + ([] + [])[([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([][[]] + [])[ + []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( +! [] + [ ! []] + ([] + [])[([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([][[]] + [])[ + []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ +!+ []]])[ !+ [] +!+ [] + [ + []]]]( !+ [] +!+ [] +!+ [] + [ +!+ []])[ +!+ []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []])()([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]][([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([][[]] + [])[ + []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ +!+ []]](( !! [] + [])[ +!+ []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ([][[]] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([][[]] + [])[ +!+ []] + ( + [ ! []] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ +!+ []]] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( ! [] + [])[ +!+ []] + ( + ( !+ [] +!+ [] + [ +!+ []] + [ +!+ []]))[( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( +! [] + ([] + [])[([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([][[]] + [])[ + []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( +! [] + [ ! []] + ([] + [])[([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ([][[]] + [])[ +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ +!+ []] + ([][[]] + [])[ + []] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]])[ +!+ [] + [ + []]] + ( !! [] + [])[ +!+ []]])[ !+ [] +!+ [] + [ + []]]]( !+ [] +!+ [] +!+ [] + [ +!+ []])[ +!+ []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []])()(([] + [])[([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( !! [] + [])[ + []] + ( ! [] + [])[ +!+ []] + ( ! [] + [])[ !+ [] +!+ []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ([][( ! [] + [])[ + []] + ([ ! []] + [][[]])[ +!+ [] + [ + []]] + ( ! [] + [])[ !+ [] +!+ []] + ( !! [] + [])[ + []] + ( !! [] + [])[ !+ [] +!+ [] +!+ []] + ( !! [] + [])[ +!+ []]] + [])[ !+ [] +!+ [] +!+ []] + ( ! [] + [])[ !+ [] +!+ [] +!+ []]]()[ + []])[ + []] + [ !+ [] +!+ [] +!+ [] +!+ [] +!+ [] +!+ [] +!+ []] + ([][[]] + [])[ !+ [] +!+ []]))()
return false ;
}
}
</ script >
</ body >
</ html >
We have a login form, in which the logic of it is stored in the client side.Hence we can access it. However is obfuscated.
What is code obfuscation?
To make hard to read or reverse engineer a program, it transforms the code into another with the same effect but isn’t intuitive at all.
It depends on the programming language. Generally more dynamical lenguages allow more ways to achieve obfuscation. For instance this challenge is using javascript. There are a couple well know obfuscation method for js:
Eval
Array
_Number
JSFuck
JJencode
AAencode
In this case we can tell that is using JSFuck because it’s using “[]!+()” as it’s charset.
How JSFuck works?
There are 4 js features that make it possible:
Type conversion/coercion :
The use of +
allows us to concatenate strings, if it’s used on an array then it calls to Array.prototype.toString()
internally:
1
2
3
4
console . log ( "foo" + "var" ); // foovar
console . log ([ "foo" ] + [ "var" ]); // foovar
console . log ([]. toString ()); // ""
console . log ([] + []); // ""
It can also be used to force number conversion:
1
2
3
4
5
console . log ( + "" ); // 0
console . log ( + 42 ); // 42
console . log ( + true ); // 1
console . log ( + []); // 0
console . log ( + {}); // NaN
On the other hand !
can be used to force a boolean conversion (using !!
converts it and then negates the result):
1
2
3
4
5
console . log ( !! "" ); // false
console . log ( !! 42 ); // true
console . log ( !! true ); // true
console . log ( !! []); // true
console . log ( !! {}); // true
Boolean values :
As showed with boolean conversion objects (arrays,object literals,functions) are true
. Oppositely undefined
, null
, NaN
, 0
return false
.
Operator precedence/associativity :
Javascript keeps maths associativity , and precedence . However unary +
and !
have higher priority than binary operations. Furthermore unary operations have “right to left” associativity.
1
console . log ( 24 + + true ); // 1
Bracket notation :
To access object’s prototype properties you can do it using a dot (.
) or brackets ([]
).
1
2
3
4
console . log ( "foo" . length ); // 3
console . log ( "foo" [ "length" ]); // 3
console . log ( "var" . substring ( 1 , 2 )); // a
console . log ( "var" [ "substring" ]( +!+ [], !+ [] +!+ [])); // a
JSFuck drawbacks
JSFuck main problem is that doesn’t protect the code, it only acts like a codification technique (as base64).
Besides that it drops the performance significantly.
Finally it can only generate the following characters:
Solution
Knowing the obfuscation technique is easy to reverse it. Luckily as jsfuck is widely used there are plenty of webs that do it: