Lauren May Matthew Henricksen William Millan Gary Carter Ed Dawson Strengthening the Key Schedule of the AES. 226-240 2002 conf/acisp/2002 ACISP http://link.springer.de/link/service/series/0558/bibs/2384/23840226.htm db/conf/acisp/acisp2002.html#MayHMCD02