Which type of security testing is being performed when an ethical hacker has no knowledge about the target system but the testing target is notified before the test?

Reversal is not a recognized penetration testing methodology category in standard security frameworks or certifications.

Gray box testing involves the tester having partial knowledge of the target system (such as some network diagrams or credentials), which contradicts the 'no knowledge' condition stated in the question.

Blind testing (also called single-blind) is defined by two characteristics: the ethical hacker receives no prior information about the target system, simulating a real external attacker's perspective, while the target organization is notified beforehand so their security team can respond and be evaluated. This tests both the attacker simulation and the defender's detection and response capabilities simultaneously.

White box testing involves the tester having full knowledge of the target environment, including architecture, source code, and credentials, which is the opposite of the 'no knowledge' condition described.