Hybrid Scheme by Using Linear Feedback Shift Registers & RSA Security

Abstract

This paper starts with stream ciphers based on linear feedback shift registers. A scheme is proposed where both the public key cryptography and the concept of linear feedback shift registers are used. The plaintext message is encrypted with n-Linear Feedback Shift Registers (LFSRs) and secret key, i.e, Initialization vector (IV) of LFSR is being sent with the help of latest public key cryptographic technique, RSA Algorithm. The suggested scheme is successfully applied on text files and on HTML files. The resultant time complexities for different file sizes are shown in tabular format and explained graphically