The sub-2.5G AES Encryption Core is a special low footprint and low-power implementation of AES engine for application requiring less than 2.5G/s. Because of its tiny footprint and low power, it works exceptionally well in system utilizing Gigabit Ethernet, fiber channel, custom linkage using RSlink/ethernet, GFP, dedicated VPN links, OTU1 and SONET/SDH OC48/12/3 and STM-16/4/1 environment. This core can also be used in wireless and satellite communications.