Stephen Early <steve@greenend.org.uk> - original author
Ross Anderson, Eli Biham, Lars Knudsen - serpent
Colin Plumb, Ian Jackson - MD5 implementation
+Steve Reid <sreid@sea-to-sky.net>, James H. Brown <jbrown@burgoyne.com> -
+ SHA1 implementation
+Cendio Systems AB - ipaddr.py
+Mark Martinec <mark.martinec@ijs.si> - portable snprintf