WPA2 primarily uses the Advanced Encryption Standard (AES) for data encryption, which is known for its robustness and is a widely accepted encryption standard. TKIP, though used in WPA, is replaced in WPA2 due to its lesser security strengths. WEP is an outdated and much less secure compared to WPA2, making its use highly discouraged. SSL, while important in secure HTTP transmissions, is not directly related to WPA2's methods for securing wireless networks.