Modelling and Cryptanalysis of Symmetric Key-Based Cryptosystem with Fibonacci Sequences for Key Variability Concept

The study of a cryptosystem is core of every information system. The aim of this paper is to model a symmetric key based system to transmit or receive information of large file size. From designer perspective it is essential to investigate the strength, weekness and characteristics of modeled cryptosystem. This paper first establishes Fibo-Q-based cryptosystem and later on analyses it from hackers or cryptanalysts perspective. During analysis, various situations have been posed and their solution has been investigated using Stochastic and Markovian Schemes. The Fibo-Q matrix has been used instead of the traditional XOR operator. To analyze them cryptic mining concepts are also discussed.