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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