---
# System prepended metadata

title: "\U0001F43BCTF\U0001F43B"

---

## 1.題目名稱：basic-mod1(100分)
### We found this weird message being passed around on the servers, we think we have a working decryption scheme.Download the message here.Take each number mod 37 and map it to the following character set: 0-25 is the alphabet (uppercase), 26-35 are the decimal digits, and 36 is an underscore.Wrap your decrypted message in the picoCTF flag format (i.e. picoCTF{decrypted_message})
![螢幕擷取畫面 2023-12-06 143913](https://hackmd.io/_uploads/Bk7fD96rT.png)

#### 使用工具：
1.https://www.dcode.fr/modulo-cipher
2.https://www.dcode.fr/base-37-cipher
#### 解題方式：
題目要求以mod37對該題所附之檔案進行解密，檔案內容如下：
165 248 94 346 299 73 198 221 313 137 205 87 336 110 186 69 223 213 216 216 177 138
以(1.)將所有數字同除以37得餘數：
17 26 20 13 3 36 13 36 17 26 20 13 3 36 1 32 1 28 31 31 29 27
再以(2.)將數字以mod37做解碼得flag：
R0UND_N_R0UND_B6B25531

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## 2.runme.py(100分)
### Run the runme.py script to get the flag. Download the script with your browser or with wget in the webshell.Download runme.py Python script
![螢幕擷取畫面 2023-12-06 150429](https://hackmd.io/_uploads/rJAlTqprp.png)

#### 使用工具：無
#### 解題方式：
把檔案載下來後以記事本打開，內容如下：
#!/usr/bin/python3
################################################################################
 Python script which just prints the flag
################################################################################

flag ='**picoCTF{run_s4n1ty_run}**'
print(flag)

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## 3.morse-code(100分)
### Morse code is well known. Can you decrypt this?Download the file here.Wrap your answer with picoCTF{}, put underscores in place of pauses, and use all lowercase.

![螢幕擷取畫面 2023-12-06 152516](https://hackmd.io/_uploads/S1jxfopB6.png)

#### 使用工具：Audacity
#### 解題方式：
將檔案下載並使用Audacity開啟，可得：
![螢幕擷取畫面 2023-12-06 151656](https://hackmd.io/_uploads/rysyxs6B6.png)
再土法煉鋼可得：
wh47_h47h_90d_w20u9h7

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## 4.file-run2(100分)
### Another program, but this time, it seems to want some input. What happens if you try to run it on the command line with input "Hello!"?Download the program here.
![螢幕擷取畫面 2023-12-06 161625](https://hackmd.io/_uploads/SyIWAjara.png)
#### 使用工具：無
#### 解題方式：
同2.，以記事本將其打開後搜尋picoCTF可得picoCTF{F1r57_4rgum3n7_be0714da}
![螢幕擷取畫面 2023-12-06 162007](https://hackmd.io/_uploads/Sya2Aopra.png)
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# CTF!!!
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## 1.WHO IS YOUR DAD?(100)
圖片用記事本開啟可得67 65 70 65 67 84 70 123 72 69 89 32 66 82 79 32 33 33 33 32 72 69 89 32 66 82 79 32 33 33 33 32 72 69 89 33 33 33 32 66 82 79 33 33 33 32 72 69 89 32 66 82 79 33 33 33 125
以ascII解可得
![螢幕擷取畫面 2023-12-07 163934](https://hackmd.io/_uploads/BJ71SZJUT.png)
Answer is CAFACTF{HEY BRO !!! HEY BRO !!! HEY!!! BRO!!! HEY BRO!!!}
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## 2.What_Is_The_Password(95)
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## 3.




