CrackFlow

A suspicious encrypted file has been recovered during an internal investigation, believed to be linked to an attacker attempting to hide critical information. The encryption method appears custom and weak, relying on a repeating numeric key applied to each character of the message. With no prior knowledge of the key, your task is to analyze the encryption logic and perform a brute-force attack to recover the original message.

By leveraging computational power and filtering meaningful outputs from noise, you must uncover the hidden content and determine what the attacker tried to conceal.

Can you recover the correct key and reveal the original message hidden within the encrypted file?