Implementation of the new LAN security standard IEEE 802.1ae (MACsec) requires the NIST standard AES cipher in the GCM mode for encryption and message authentication, as well as header parsing and formatting operations on the transmitted and received packets. MACsec Security Processor (MSP) IP cores by IP Cores, Inc. are designed for high data rates and implement complete line-rate packet processing with no per-packet CPU intervention. The MSP10-512/256 cores are tuned for 100 Gbps applications on modern FPGAs that require 256 bit AES keys.