I have a 7.8 CGPA is it good enough for a master of science in information technology from Germany?

7.8 CGPA is generally considered good and can make you a competitive applicant, particularly if your fundamentals in IT and related subjects are strong. German universities do look at your academic performance, but they also value practical experience and skills in the field. 

Make sure to highlight any relevant projects or internships in your application. Also, some universities might require you to clear a pre-admission test or an interview, so be prepared for that. All the best with your application!