Changes compared to phase 1 : Achterbahn has been tweaked to enter
phase 2 of eSTREAM, and the new version is called Achterbahn-128/80 by the
authors. The archived page with the results on the old version can be
found here.
Cryptanalysis :
Martin Hell and Thomas Johansson, "Cryptanalysis of Achterbahn-128/80", pdf, submitted 2006-11-20, updated 2007-05-08.
Maria Naya Plasencia, "Cryptanalysis of Achterbahn-128/80", pdf, submitted 2006-11-20.
Maria Naya-Plasencia, "Cryptanalysis of Achterbahn-128/80 with a new keystream limitation", pdf, submitted 2007-02-05.
Rainer Göttfert, Berndt M. Gammel, "On the frame length of Achterbahn-128/80", pdf, submitted 2007-05-11.