Al Khwarizmi CTF Contest

Reverse Engineering

Returing is Hard

Just patching the program to execute the print_flag function was enough.

Slogran of July

Wanna Hang Haxina

Using strings command:

This string appeared twice. So:

The file is a PNG image encrypted with ASCII Shift of +5

try:
    with open("encrypted.file", "rb") as f:
        data = f.read()
    decrypted = bytes([(b - 5) % 256 for b in data])
    with open("flag.png", "wb") as f:
        f.write(decrypted)
    print("Success! Open flag.png to see the image.")
except Exception as e:
    print(e)

That gives an image with the flag:

Steganography

Unlimited Crack

Forensics

Forensics - 1

It said something about digital signature. So I tried it. Took a few attempts:

First thing I did was select all texts with Control+A then made all font color to black:

That gave the first flag: