Files
picoCTF/investigative_reversing_4/sol.py
2024-06-10 14:52:01 +02:00

27 lines
568 B
Python
Executable File

#!/home/maxime/.pyvenv/bin/python3
for c in range(5, 0, -1):
with open("Item0" + str(c) + "_cp.bmp", 'rb') as f:
img = f.read()
leading_space = 2019
flag_size = 10
enc_size = flag_size * (8 + 4)
enc_buffer = img[leading_space:leading_space + enc_size]
flag_buffer = [''] * flag_size
for i in range(flag_size):
char = 0
enc_offset = i * (8 + 4)
for j in range(8):
char |= (enc_buffer[enc_offset+j] & 1) << j
flag_buffer[i] = chr(char)
print(''.join(flag_buffer), end='')
print()