Disadvantage 1) Can be damaged by external users by hacking. TYPES OF SCADA SYSTEMS 1) Early or Monolithic SCADA systems The first SCADA systems held all operations in one, usually a mainframe, computer
CHAPTER 1 INTRODUCTION 1.1 Cryptography The word cryptography is derived from the Greek words Cryptos meaning cover and grafia meaning writing [1] defining it as covered writing. In image cryptography the information is hidden exclusively in images. Cryptography is the art and science of secret communication .It is the practice of encoding/embedding secret information in a manner such that the existence of the information is invisible. The original files can be referred to as cover text, cover image