image_corruption.py

#!/usr/bin/python3
 
img = bytearray(open('matrix_modified.bmp', 'rb').read())
 
key = "matrix"
 
new_f = []
for i, x in enumerate(img):
    new_f.append(hex(ord(key[i%6]) ^ x))
 
result = bytes([int(x,0) for x in new_f])
 
with open("image.bmp", "wb") as newFile:
    newFile.write(result)