substitution-permutation network , not a Feistel network . AES is fast in both software and hardware , is relatively easy to implement, and requires little memory . As a new encryption standard, it is currently being deployed on a large scale. http://en.wikipedia.org/wiki/Advanced_Encryption_Standard Icons used coming from: http://www.paolocampitelli.com/kde-icons/ and http://www.crystalxp.net/ A crystal