The University of Bochum offers a wide range of courses in the field of IT security both for undergraduate and graduate students and for PhD students.
The department of electrical engineering and information technology offers the nine semester long course of studies "IT security" which can be completed with a German diploma "Dipl.-Ing. IT Security".
This course of studies now exists for more than three years.

You can more information at: http://www.its.ruhr-uni-bochum.de/