Counter Mode with Cipher Block Chaining Message Authentication Code Protocol (CCMP) is an encryption protocol that forms part of the 802.11i standard for wireless local area networks (WLANs), particularly those using WiMax technology. The CCMP algorithm is based on the U.S. federal government's Advanced Encryption Standard (AES).
CCMP offers enhanced security compared with similar technologies such as Temporal Key Integrity Protocol (TKIP). CCMP employs 128-bit keys and a 48-bit initialization vector that minimizes vulnerability to replay attacks. The Counter Mode component provides data privacy. The Cipher Block Chaining Message Authentication Code component provides data integrity and authentication. The enhanced privacy and security of CCMP compared with TKIP requires additional processing power, often necessitating new or upgraded hardware.
802.11i is a standard for WLANs that provides encryption for networks that use the 802.11a, 802.11b and 802.11g standards. The AES is an encryption algorithm for securing sensitive but unclassified material by government agencies. It may eventually become the de facto encryption standard for commercial transactions in the private sector.