What term describes an unauthorized access method that bypasses normal authentication?

The correct term for an unauthorized access method that bypasses normal authentication is a backdoor connection. A backdoor is typically a method of bypassing normal authentication procedures, allowing an attacker to gain access to a system or network without going through the usual security measures. This might be implemented by embedding malicious code within software or by exploiting vulnerabilities in systems to create a pathway for future unauthorized access.

Backdoors can be particularly dangerous because they allow attackers to maintain access to a system even after typical security measures have been implemented or upgraded. This means that even if a system is secured and monitored, an effective backdoor may allow an attacker to evade detection and maintain control over the system.

The other terms listed do not specifically refer to this method of unauthorized access. Malware attacks typically involve malicious software designed to disrupt, damage, or gain unauthorized access to systems but do not inherently describe a method of bypassing authentication. Social engineering involves manipulating individuals to disclose confidential information, which differs from a technical bypass of authentication systems. Finally, a denial of service is an attack aimed at making a service unavailable to users, rather than facilitating unauthorized access.