Play Nice
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Not all ancient ciphers were so bad... The flag is not in standard format.
nc mercury.picoctf.net 6057
playfair.py
Look at the source code and at the bottom it links to
Find a Playfair cipher decoder, such as . Paste in the ciphertext y7bcvefqecwfste224508y1ufb21ld
and the alphabet/key meiktp6yh4wxruavj9no13fb8d027c5glzsq
. Make sure to increase the grid size to 6x6 so the entire alphabet fits.
Click "Decrypt" to get WD9BUKBSPDTJ7SKD3KL8D6OA3F03G0
convert this to lowercase with python -c "print('WD9BUKBSPDTJ7SKD3KL8D6OA3F03G0'.lower())"
to get wd9bukbspdtj7skd3kl8d6oa3f03g0
.
Paste the decrypted text into the program on the server to get the flag: Congratulations! Here's the flag: 2e71b99fd3d07af3808f8dff2652ae0e
.
2e71b99fd3d07af3808f8dff2652ae0e