# Login
1. *head* 內提到`<script src="index.js"></script>` =>https://login.mars.picoctf.net/index.js
2. atob('cGljb0NURns1M3J2M3JfNTNydjNyXzUzcnYzcl81M3J2M3JfNTNydjNyfQ')=>**'picoCTF{53rv3r_53rv3r_53rv3r_53rv3r_53rv3r}'**

refs:
In these APIs, for mnemonic purposes, the "b" can be considered to stand for "binary", and the "a" for "ASCII"(in base64). In practice, though, for primarily historical reasons, both the input and output of these functions are Unicode strings.
1. atob: https://developer.mozilla.org/zh-CN/docs/Web/API/atob
2. btoa: https://developer.mozilla.org/zh-CN/docs/Web/API/btoa#unicode_strings