Atoms

Atoms

Category

Steganography

Description

Dmitri sends us this message, will you be able to retrieve the secret message hidden inside?

MtMdDsFmMdHsMdMdUuo

Format : Hero{flag}
Author : xanhacks

Write up

Atoms (name of the challenge) + Dmitri (sender) leads us to the periodic table of elements created by Dmitri Mendeleev.

For example: Mt => Meitnerium(109) => ASCII(109) => m

Then we can do a python script to decode this message :

#!/usr/bin/env python3
import re

cipher = "MtMdDsFmMdHsMdMdUuo"
convert = {
    'Fm': 100,
    'Md': 101,
    'Hs': 108,
    'Mt': 109,
    'Ds': 110,
    'Uup': 115,
    'Uuo': 118
}

for found in re.findall('[A-Z][a-z]*', cipher):
    print(chr(convert[found]), end="")
print()

Execution :

$ python3 solve.py 
mendeleev

Flag

Hero{mendeleev}