Challenge description

The top engineers of BB Industry a.s. upgraded last year's Enhanced PLC Encryption Standard (EPES) to the next level (EPES2). To achieve the highest grade of security in OT environments, BB uses the latest generation of the LibrePLC crypto modules that do all the crypto stuff. BB's research department sent the attached testing files. You need to check whether the crypto scheme is secure. (Or just pass it as it looks extremely secure and unbreakable.)