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Write-up.md

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Imposters

Description

I hid flag in this file but now even I can't open it :(

hint.pdf

Points: 300

Hints to the Solution

Are you sure its a PDF?

Also, look up LSB Encoding

Steps to the Solution
  • When you do a hexdump of the file, you see something odd is up with the magic numbers. It ain't a PDF. It's a GIF!
  • Just changing the extension to .gif allows us to open the file!
  • LSB?? As in LSB Encoding???
binary_data = open("hint.gif","rb") # Open the file binary mode
# binary_data.seek(80)  #seek to 54 bytes these bytes does not contain any data
data = binary_data.read() # read the binary data
# print(data)
l = [] 
for i in data:
    l.append(bin(i)[-1])  #make a list of LSB bits
for i in range(0,5000,8):
    print(chr(int(''.join(l[i:i+8]),2)),end='') # print the character