It takes two

A target, having previously failed to secure their data with a single weak key, has implemented a double encryption scheme using two small keys under the false assumption that it provides adequate security. You have been tasked with proving that this implementation remains highly vulnerable.

OBJECTIVE

analyze the given script to find cryptographic weakness, then exploit the double encryption scheme. Write a custom script to compute the cipher states,  and decrypt the data to recover the plaintext flag.

Flag format: FLAG{}

Infrastructure: None

Provided Files: Python script, ciphertext