الفهرس 
PreliminariesOnly 14 pages are availabe for public view
 |  | from | 121 |  |  |
| | | from | 121 | | |
Abstract
Since S-AES cryptosystem has been developed 12 years ago, it has
received a lot of attention in the academic research. In this thesis, we
are interesting to S-AES cryptosystem and concentrate mainly on its
analysis to show that it is insecure by applying a new approach. We
also propose a new application of an intelligent agent system. The
thesis consists of five chapters, one appendix and bibliography.
Chapter One: It includes the fundamental concepts and terminology
from cryptography and algebraic structures which are used in the
next chapters.
Chapter Two: In this chapter, we describe the S-AES cryptosystem.
We present its key expansion, encryption/decryption. Also in
this chapter, we discuss the cryptographic attacks on S-AES.
Chapter Three: In this chapter, we give a introduction of the satisfiability
problem. Also in this chapter, we give a way to convert
S-AES encryption to CNF.
Chapter Four: In this chapter, we give an introduction about an
intelligent agent and rule based system. Also in this chapter, we discuss
some applications for the intelligent agent.
Chapter Five: In this chapter, we define an encryption model of
E-CNF, its validity, and the key-equivalent of two encryption models.
xi
xii
Also, we propose the construction related issues of proposed cryptanalytic
agent system. At the end of the chapter, we present the results
that we have obtained and the conclusion to our work.