$ ctf42

beginners_rev_2023

Difficulty Not rated yet

Flag format: TSGCTF{...}

JA / EN

Let's just deal with them one by one, shall we?

Hints for beginners:

Take a look at the whole program with Ghidra, IDA Free, etc.
Run it with x64dbg or Windbg!
Maybe the encryption method and conversion operation can be found by Googling?
What is the input string ultimately compared to?
Let's undo each operation.

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