What defines an integrity attack in a wireless network?

An integrity attack in a wireless network typically involves actions that compromise the integrity of data being transmitted. Sending forged frames is a prime example of this type of attack. By manipulating or crafting data packets to appear as if they are originating from a legitimate source, an attacker can disrupt the communication process, inject false information, or manipulate the intended outcome of the communication. This undermines the trustworthiness and accuracy of the data within the network, which is central to an integrity attack.

In contrast, other options such as sending encrypted data packets relate more to confidentiality rather than integrity. Blocking legitimate traffic can lead to denial-of-service situations, which disrupts accessibility rather than altering data integrity. Capturing sensitive credentials is focused on confidentiality and data theft, rather than integrity issues—although capturing credentials can lead to other integrity-related attacks, they are not integrity attacks themselves. Thus, sending forged frames directly relates to the concept of altering data integrity, making it the correct choice.