Chapter 1 Introduction
1.1 Background of
The concern about information security started from the very beginning (creation of universe), this concern
started when people first started having information and willing to share among themselves. The
communication channel in which this shared information is going through is subject to leakage and as a result
insecurity, so people started thinking of a ways to share their information without worrying about their data to
be compromised by an unauthorized party. First they invented a very basic ways to protect the privacy of their
information such as Caesar’s cipher, these basic ciphers later on evolved into a very cumbersome and complex
ways to protect the confidentiality of the information such as, DES,3DES,AES, RSA and many other
algorithms. According to Brandau(2008),although most of communication systems employ some sort of
security mechanism but always there is a security leakage in most of those systems, therefore voice encryption
is used in order to ensure that the voice transmitted from one end to another in Real-Time communication
systems such as, GSM, VOIP, Telephone and Analog Radio arrives safely without being compromised.
1.2 Problem Statement
In today’s world with the technological advancements the security issue arises, especially when dealing
with wireless communications. In wireless communications the channel in which the Data is transmitted
through is Air and Air is a common channel in which everybody
has the ability to tap
into. This makes the voice
which is travelling through this channel either over IP, GSM or Radio vulnerable for attacks. Therefore this
research was conducted to design a system which deals
with the above mentioned issue.
1- To design a system to encrypt/decrypt using AES-128 and scramble/descramble
a voice signal.
2- To compare the performance of the Digital
encryption using AES-128 and scrambling method.
In this project SIMULINK is going to be used to implement the design
and implementation of matrix based shoulder surfing security system.