You are trying to break into a highly classified top-secret mainframe computer with highest security system in place at Merclyn Barley Bank located in Los Angeles. You know that conventional hacking d

While 'zero-day' exploits are powerful, the question implies that the system is 'impenetrable' even against advanced technical means. Relying solely on discovering or buying a zero-day does not guarantee access, and social engineering is a more direct path when technical defenses are presumed insurmountable.

When technical systems are described as 'impenetrable,' the most common and often successful approach for attackers is social engineering. This involves manipulating individuals through psychological tactics, such as building rapport or exploiting trust, to gain access to information or systems that are otherwise protected by technology.

Launching DDoS attacks primarily aims to disrupt the availability of a service (Denial of Service), not to gain unauthorized access or 'break into' the mainframe computer itself.

Man-in-the-Middle (MiTM) attacks intercept and potentially alter network traffic, but for a 'highly classified top-secret mainframe' with high security, establishing a MiTM might be challenging and might not directly yield internal system access or bypass strong authentication mechanisms without further steps.