1. Network Security has a significant role in securing the vital information.
Stream ciphers, which are the most important class of symmetric
algorithms are widely used in protecting the digital information. However,
these days variety of attacks (algebraic and so on) are encountered in
stream cipher which is creating problem in providing security to the
information. This is the main motivation behind our research.
Our main research goal is to describe and analyze design of stream cipher in
network security.
INTRODUCTION PROCEDURE
Design of proposed Stream cipher is done through the analysis of
 Algebraic immunity (AI) of Boolean functions
 S-Boxes (usually called substitution box or substitution cipher).
 Thus in process of designing stream cipher, cryptographic properties of
non-linear transformations have been used.
 There are many LFSR based stream ciphers which use non-linear Boolean
function which destroy linearity of LFSR output. Even these were broken
by algebraic attacks. Thus, we analyze new and significant class of non-
linear Boolean functions for LFSR based stream ciphers resistance to
algebraic attacks. This is shown as a practical example to show the
effectiveness of our design.
 Over GSM, communication is on air, so data can be attacked easily. In
order to send original data without attacks, we are analyzing on how the
stream cipher can be used to protect the data.
SECTION 3
From the analysis done so far, we have found that the new stream cipher can be implemented to securely
send the data through the network. This can be done by using non linear S-box, LFSRs and algebraic
immunity. Also, information shared over air can be made more secure by using stream ciphers in the GSM
network. This further analysis serves as future scope of our research.
DISCUSSION AND CONCLUSION
ACKNOWLEDGEMENTS
DESIGN AND ANALYSIS OF STREAM CIPHER FOR
NETWORK SECURITY
TEJASRI SALADI
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