CTF签到题

 1.题目：VmxkMFUxVXhTbkpOU0dSVVZrWktWRlpyVm5kU2JGSnlWbXhhYkdKRlduaFpWVlpoVkcxRmQwMUlhRlpXTTFKUVZXdFZlR05zWkZsaVJrcG9ZbGRvUmxaR1dsZFVhekZIVW14V1lWSlZOVkJVVlZaV1RVWldjbFZzVGxOTlJGWlhWa1pvZDFWdFJuTlRhMVpXVm14YVIxUlVSa2RPYkVweVYyeENWMVpVUlhwV1ZtUjNVMjFXVjFOclZsZGhNbEpQV1ZSR1IwNVdVbGRTVjNoT1RVWkdjMVJVUWxKS1ZFNUY=

2.答案：糟糕糟糕偶买噶魔法怎么失灵啦-_-!

3.write up:

第一步，base64解码，解出：Vld0U1UxSnJNSGRUVkZKVFZrVndSbFJyVmxabGJFWnhZVVZhVG1Fd01IaFZWM1JQVWtVeGNsZFliRkpoYldoRlZGWldUazFHUmxWYVJVNVBUVVZWTUZWclVsTlNNRFZXVkZod1VtRnNTa1ZWVmxaR1RURkdObEpyV2xCV1ZURXpWVmR3U21WV1NrVldhMlJPWVRGR05WUldSV3hOTUZGc1RUQlJKVE5F

第二步，base64编码，解出VWtSU1JrMHdTVFJTVkVwRlRrVlZlbEZxYUVaTmEwMHhVV3RPUkUxcldYbFJhbWhFVFZWTk1GRlVaRU5PTUVVMFVrUlNSMDVWVFhwUmFsSkVVVlZGTTFGNlJrWlBWVTEzVVdwSmVWSkVWa2ROYTFGNVRWRWxNMFFsTTBRJTNE

第三步，base64编码，解出：

UkRSRk0wSTRSVEpFTkVVelFqaEZNa00xUWtORE1rWXlRamhETVVNMFFUZENOMEU0UkRSR05VTXpRalJEUVVFM1F6RkZPVU13UWpJeVJEVkdNa1F5TVElM0QlM0Q%3D

第四步，出现%，url编码，解出：UkRSRk0wSTRSVEpFTkVVelFqaEZNa00xUWtORE1rWXlRamhETVVNMFFUZENOMEU0UkRSR05VTXpRalJEUVVFM1F6RkZPVU13UWpJeVJEVkdNa1F5TVElM0QlM0Q=

第五步，base64编码，解出：

RDRFM0I4RTJENEUzQjhFMkM1QkNDMkYyQjhDMUM0QTdCN0E4RDRGNUMzQjRDQUE3QzFFOUMwQjIyRDVGMkQyMQ%3D%3D

第六步，出现%，url编码，解出：RDRFM0I4RTJENEUzQjhFMkM1QkNDMkYyQjhDMUM0QTdCN0E4RDRGNUMzQjRDQUE3QzFFOUMwQjIyRDVGMkQyMQ==

第七步，base64编码，解出：

D4E3B8E2D4E3B8E2C5BCC2F2B8C1C4A7B7A8D4F5C3B4CAA7C1E9C0B22D5F2D21

第八步，第七步答案为16进制数，GB2312可以解码出有意义的字符：

糟糕糟糕偶买噶魔法怎么失灵啦-_-!