# Prior Knowledge & Writeup Link ###### tags: `Information` `English` ## Prior Knowledge - Browser & Google - Know how to use browser & Google - Linux - Know how to use basic commands like `cd`, `ls`, `chmod`, `wget`, ... - Know how to use `nc` & `socat` - C - Can understand general C code - Python - Can write some basic Python scripts - Know how to use `pwntools` - Ghidra / IDA --- ## Writeup Link ### Web - [HTML](https://hackmd.io/@LoTuX-CTF/HTML_EN) - [Useful Tools](https://hackmd.io/@LoTuX-CTF/Useful_Tools_EN) - [THE EYE 2](https://hackmd.io/@LoTuX-CTF/THE_EYE_2_EN) - [Trending Cats](https://hackmd.io/@LoTuX-CTF/Trending_Cats_EN) ### Reverse - [Heart Jack's Quiz](https://hackmd.io/@LoTuX-CTF/HeartJacksQuiz_EN) - [Rev C 1](https://hackmd.io/@LoTuX-CTF/RevC1_EN) - [Rev C 2](https://hackmd.io/@LoTuX-CTF/RevC2_EN) - [Rev C 3](https://hackmd.io/@LoTuX-CTF/RevC3_EN) - [BlockNinja](https://hackmd.io/@LoTuX-CTF/BlockNinja_EN) ### Pwn - [ASAP](https://hackmd.io/@LoTuX-CTF/ASAP_EN) - [Tears of the Kingdom (Lite)](https://hackmd.io/@LoTuX-CTF/Tears_of_the_Kingdom_EN) - [Skewer Shop](https://hackmd.io/@LoTuX-CTF/Skewer_Shop_EN) - [LoTuX Fundraising Platform 1](https://hackmd.io/@LoTuX-CTF/LoTuX_Fundraising_Platform_1_EN) ### Misc - [ChatBot](https://hackmd.io/@LoTuX-CTF/ChatBot_EN) - [GameBot](https://hackmd.io/@LoTuX-CTF/GameBot_EN) - [THE EYE 1](https://hackmd.io/@LoTuX-CTF/THE_EYE_1_EN) - [吾有一圖](https://hackmd.io/@LoTuX-CTF/吾有一圖_EN) - [Chemistry](https://hackmd.io/@LoTuX-CTF/Chemistry_EN) ### Crypto - [How Is Your Math](https://hackmd.io/@LoTuX-CTF/How_Is_Your_Math_EN) - [Secure Store GPT](https://hackmd.io/@LoTuX-CTF/Secure_Store_GPT_EN) - [Ultra Easy RSA](https://hackmd.io/@LoTuX-CTF/Ultra_Easy_RSA_EN) - [Where Is My Bit](https://hackmd.io/@LoTuX-CTF/Where_Is_My_Bit_EN) - [Lazy Nonce](https://hackmd.io/@LoTuX-CTF/Lazy_Nonce_EN) ### {%hackmd M1bgOPoiQbmM0JRHWaYA1g %}
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LoTuX CTF
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[EN] Rev C 2

[name=FlyDragon] Step.1 By observing output.txt and executing the code, it can be inferred that the program flag.exe will output the flag after shuffling it. Step.2 By examining main() using Ghidra, it can be discovered that this program reads in the contents of flag.txt and outputs them after performing specific swaps in a particular order. order = [5, 13, 0, 12, 1, 16, 3, 2, 8, 7, 15, 4, 6, 17, 11, 10, 9]

11/1/2023
[CH] Rev C 2

[name=FlyDragon] Step.1 觀察 output.txt 以及執行程式碼 可猜測 flag.exe 會將flag打亂後輸出 Step.2 使用ghidra查看 main() 可以發現這個程式會讀入flag.txt、照特定的順序交換後輸出

11/1/2023
LoTuX CTF Writeup Dark Theme

LoTuX CTF Writeup Dark Theme Design By Curious

10/2/2023
[EN] Blank Site 2

[name=Curious] Train of Thought & Solution Continuing from the previous question's Writeup, after downloading app.py, you can find the following piece of code: @app.get('/1d538e83d6f6b08f') def secret(): try: with open('/proc/sys/kernel/random/boot_id') as f: hint = f.readline().strip()

9/25/2023
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