Can You Get The Image? (75)

Description

flag.png

Write Up

• If we open that image in HxD, we will find:

  .IEND®B`‚ÿÿØØÿÿàà....JJFFIIFF..........``..``....ÿÿÛÛ..CC.......

• It seems that two jpg image (based on jpg file signature) appended with pattern:

  12121212....

• We can use this script to get that two image:

file = open('flag.png', 'r')
file_one = open('jpg_one.jpg', 'w')
file_two = open('jpg_two.jpg', 'w')

data = file.read()

for i in range(0x47B9, len(data)):
    if i % 2 == 0:
        file_one.write(data[i])
    else:
        file_two.write(data[i])

file.close()
file_one.close()
file_two.close()

• Open the image and we will get the flag: COMPFEST9{tw0_1m493_1n_0n3_f1l3}