WPA is a protocol that was introduced in 2003, and the Wi-Fi Alliance replaced it with the WEP protocol. WPA is similar in structure to WEP but has improved user authorization and security key processing. WPA also uses the Time Key Integrity Protocol (TKIP), while WEP provides all authorized systems with the same key. Thus, the WAP operating principle allows an attacker to create his encryption key, according to the one used for the secure network.