Compatible design of CCMP and OCB AES cipher using separated encryptor and decryptor for IEEE 802.11i

We propose a compatible design of CCMP and OCB AES cipher using separated encryptor and decryptor for IEEE 802.11i. IEEE 802.11i - wireless LAN security working group - CCMP mode or on OCB mode. Our design supports all these two modes of operation. In the OCB mode, it uses very small amount of memory to generate offset values. Also in the CCMP mode, it doesn´t need to update the initial vector and update only one counter value considering the packet architecture of wireless LAN. The implemented OCB and CCMP feature 400 Mbps and 243 Mbps throughput respectively at 50 MHz frequency, which are targeted to Xilinx Vertex FPGA device.