[247CTF] TRUSTED CLIENT

🚩 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?

이번 문제는 쉽다. JSF*CK으로 난독화 되어있는 문제이다.

그대로 복사해서 콘솔에 붙여넣고, 마지막 '(괄호)'를 제거한다음 ENTER를 누르면 된다.

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[])[+!+[]]])[+!+[] + [+[]]] + (!![] + [])[+!+[]]])[!+[] + !+[] + [+[]]]](!+[] + !+[] + [+[]])) + (+[![]] + [][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]])[+!+[] + [+!+[]]] + [][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]][([][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]])[+!+[] + [+[]]] + ([][[]] + [])[+!+[]] + (![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[+!+[]] + ([][[]] + [])[+[]] + ([][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]])[+!+[] + [+[]]] + (!![] + [])[+!+[]]]((!![] + [])[+!+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + ([][[]] + [])[+[]] + (!![] + [])[+!+[]] + ([][[]] + [])[+!+[]] + (+[![]] + [][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]])[+!+[] + [+!+[]]] + ([][[]] + [])[+[]] + ([][[]] + [])[+!+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (![] + [])[!+[] + !+[] + !+[]] + ([][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]] + [])[!+[] + !+[] + !+[]] + (![] + [])[+!+[]] + (+(!+[] + !+[] + [+!+[]] + [+!+[]]))[(!![] + [])[+[]] + (!![] + [][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]])[+!+[] + [+[]]] + (+![] + ([] + [])[([][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]])[+!+[] + [+[]]] + ([][[]] + [])[+!+[]] + (![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[+!+[]] + ([][[]] + [])[+[]] + ([][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]])[+!+[] + [+[]]] + (!![] + [])[+!+[]]])[+!+[] + [+[]]] + (!![] + [])[+[]] + (!![] + [])[+!+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + ([][[]] + [])[+!+[]] + (+![] + [![]] + ([] + [])[([][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]])[+!+[] + [+[]]] + ([][[]] + [])[+!+[]] + (![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[+!+[]] + ([][[]] + [])[+[]] + ([][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]])[+!+[] + [+[]]] + (!![] + [])[+!+[]]])[!+[] + !+[] + [+[]]]](!+[] + !+[] + !+[] + [+!+[]])[+!+[]] + (!![] + [])[!+[] + !+[] + !+[]])()([][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]][([][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]])[+!+[] + [+[]]] + ([][[]] + [])[+!+[]] + (![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[+!+[]] + ([][[]] + [])[+[]] + ([][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]])[+!+[] + [+[]]] + (!![] + [])[+!+[]]]((!![] + [])[+!+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + ([][[]] + [])[+[]] + (!![] + [])[+!+[]] + ([][[]] + [])[+!+[]] + (+[![]] + [][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]])[+!+[] + [+!+[]]] + (!![] + [])[!+[] + !+[] + !+[]] + (![] + [])[!+[] + !+[] + !+[]] + ([][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]] + [])[!+[] + !+[] + !+[]] + (![] + [])[+!+[]] + (+(!+[] + !+[] + [+!+[]] + [+!+[]]))[(!![] + [])[+[]] + (!![] + [][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]])[+!+[] + [+[]]] + (+![] + ([] + [])[([][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]])[+!+[] + [+[]]] + ([][[]] + [])[+!+[]] + (![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[+!+[]] + ([][[]] + [])[+[]] + ([][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]])[+!+[] + [+[]]] + (!![] + [])[+!+[]]])[+!+[] + [+[]]] + (!![] + [])[+[]] + (!![] + [])[+!+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + ([][[]] + [])[+!+[]] + (+![] + [![]] + ([] + [])[([][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]])[+!+[] + [+[]]] + ([][[]] + [])[+!+[]] + (![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[+!+[]] + ([][[]] + [])[+[]] + ([][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+[]] + (!![] + [][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]])[+!+[] + [+[]]] + (!![] + [])[+!+[]]])[!+[] + !+[] + [+[]]]](!+[] + !+[] + !+[] + [+!+[]])[+!+[]] + (!![] + [])[!+[] + !+[] + !+[]])()(([] + [])[([![]] + [][[]])[+!+[] + [+[]]] + (!![] + [])[+[]] + (![] + [])[+!+[]] + (![] + [])[!+[] + !+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + ([][(![] + [])[+[]] + ([![]] + [][[]])[+!+[] + [+[]]] + (![] + [])[!+[] + !+[]] + (!![] + [])[+[]] + (!![] + [])[!+[] + !+[] + !+[]] + (!![] + [])[+!+[]]] + [])[!+[] + !+[] + !+[]] + (![] + [])[!+[] + !+[] + !+[]]]()[+[]])[+[]] + [!+[] + !+[] + !+[] + !+[] + !+[] + !+[] + !+[]] + ([][[]] + [])[!+[] + !+[]]))()
                    return false;
                }
            }

JSF*CK 참 쉽죠잉?~