Master thesis of Olaf Gellert
University of Hamburg, Department of Informatics,
Applications of Informatics in science and technic.
Coaches: Prof. Dr. Klaus Brunnstein
& Dr.  Hans-Joachim Mück
With the expansion of the internet and its increasing commercial
use the number of computers and networks is growing
that process important and sensitive data but need
a connection to the worldwide net.
This makes it necessary to ensure the authenticity,
privacy and integrity of data that is exchanged over
the network. But the internet protocols in use today
show some considerable week spots, so that commercial
use of the internet meets some limitations.
This master thesis gives an overview about the nethods
to ensure the necessary security properties of data
exchange. Furthermore proposed and existing solutions
to these problems are presented and their advantages
and weaknesses are discussed. The main part of the
work shows the integration of suitables methods into
the TCP-protocol-layer to ensure a secure communication
between applications. During the work a prototype was developed
This is a postscript of the whole work (German only, sorry): Master thesis