I have applied online.First round was written .It consists of aptitude and technical.Most of the technical questions were from networking.It would be enough if refer your cryptography book.then,the second round was HR.She asked questions like tell me abt urself and some networking questions.

1st round is Aptitude it contains 1)C program (we have to answer output of the given program) 2)Android(some fundamentals of android) 3)Javascript (few program outputs and some definition) 4)OS and networking (theory questions) 5)x86 Assembly language