Final answer:
The IV key size in WPA2 is 48 bits. WPA2 utilizes this IV size to enhance security against replay attacks. Advanced WPA2-CCMP uses AES encryption with key sizes of 128, 192, or 256 bits, though the IV size remains at 48 bits.
Step-by-step explanation:
The question regarding the IV key size used in WPA2 pertains to wireless network security. WPA2 (Wi-Fi Protected Access 2) is a security protocol that provides a secure connection for wireless networks. The IV (Initialization Vector) is a part of the package to provide security to the network.
For WPA2, the IV key size is 48 bits. It is crucial in preventing attacks such as replay attacks, where an attacker could use old IVs to generate data packets that appear as legitimate traffic. The larger IV size in WPA2, compared to the older WEP protocol, greatly enhances the security and complexity, making it more difficult for potential intruders to decipher the encryption.
It's important to note that this 48-bit IV size is a standard component of the Temporal Key Integrity Protocol (TKIP), which was used in early implementations of WPA2. However, the advanced WPA2 protocol, also known as WPA2-CCMP, uses the Advanced Encryption Standard (AES) for which the key size can be 128, 192, or 256 bits, although the IV size remains the same.