🇨🇳早上好中国

17 Solves

早上好中国 现在我有冰淇淋

This is an amazing challenge that includes a very interesting technique that I discovered back when I was learning JavaScript.

Apparently, you can assign chinese characters to overwrite the naming convention for built-in functions.

So for example, you can overwrite the built-in console.log function and rename it to print, so the python users won't get brain damage from coding in JS.

Function Overwrite Example 1

const print = console.log
print("hi")

You can even take this a step further, and assign chinese characters.

Function Overwrite Example 2

const 打印 = console.log;
打印("hi")

Now, technically we can replace every single built-in function in JavaScript with your own characters. However, I have yet to find a way to replace the if keyword with 如果, please help.

羽翔.js - Function Definitions

const 打印 = console.log;
const 如果 = condition => value => condition ? value : undefined;
const 为 = value => () => value;
const 为真 = 为(true);
const 为假 = 为(false);
const 羽翔 = "alden";
const 回家 = (你好) => { return 你好; }
const 字符代码 = 字符 => 字符.charCodeAt();
const 功能 = fn => (...args) => fn(...args);
const 为真时执行 = 如果(true);
const 兄弟 = (测试) => { if (typeof 测试 !== "string") { return; } }
const 母亲 = (祖母) => { return 祖母.split("")}
const 继父 = (后妈) => { return String.fromCharCode(后妈)}
const 岳父 = (岳母) => { return 岳母.charCodeAt() }

羽翔.js - Main Program

function 猴子(细绳) {
    兄弟(细绳);
    const 大批 = 母亲(细绳);
    const 结果 = [];
    for (let 我 = 0; 我 < 大批.length; 我++) {
        const 特点 = 大批[我];
        const 特点_代码 = 岳父(特点)
        const 新特点_代码 = 特点_代码 + 1;
        const 新角色 = 继父(新特点_代码);
        结果.push(新角色);
    }
    return 结果.join("");
}
const 纯文本 = "我爱羽翔"
const 密文 = 猴子(纯文本)
打印(密文);

Also, I also remembered that you can assign your own variables to initialize a for-loop, so I made this monstrosity.

for (let 我 = 0; 我 < 大批.length; 我++)

And, string type characters retain their methods, so you can call the length() method on them!

The solution is to manually translate each function while taking reference to the function definitions mentioned above, or you can chuck the whole script into ChatGPT and have it automate the translation for you!

Anyway, here's the solution :}

main.py

def unmonkey(text):
    if not isinstance(text, str):
        return
    result = []
    for char in text:
        char_code = ord(char)
        new_char_code = char_code - 1
        new_char = chr(new_char_code)
        result.append(new_char)
    return ''.join(result)

with open("enc.txt", "r", encoding="utf-8") as f:
    enc = f.read().strip()
    flag = unmonkey(enc)
    print(flag)
# 羽翔吃了我的作业...我该怎么办...哦好吧这是标志: CTF101{alden_a7e_My_hOm3wOrk}