AES

AES

Description

The encryption looks solid… but something isn’t right.

Author : Z3U55

Files

• AES.py

• AES.txt

AES

Flag: Spark{A3S_1s_s1mpl3_4sf}

Description: AES-CBC decryption with key and IV provided.

Solution: Straightforward AES-CBC decryption:

from Crypto.Cipher import AES
from Crypto.Util.Padding import unpad

key = bytes.fromhex('bb9ff5edc3641e9904df4454a791a6ee')
iv = bytes.fromhex('2146af68c022f3486fdf6e52c05426bd')
ciphertext = bytes.fromhex('90aa85aaa23a7d0e461554715bb3569234f0d2d9fdda573611510ceb6a5544a0')

cipher = AES.new(key, AES.MODE_CBC, iv)
plaintext = cipher.decrypt(ciphertext)
flag = unpad(plaintext, AES.block_size)

print(flag.decode())  # Spark{A3S_1s_s1mpl3_4sf}

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