Design And Implementation Of Computer Security: Data Encryption, Decryption And Key Hash Algorithms

CHAPTER ONE 1.0   INTRODUCTION In the past, security was simply a matter of locking the door or storing files in a locked filing cabinet or safe. Today, paper is no longer the only medium of choice for housing information. Files are stored in computer databases as well as file cabinets. Hard drives and floppy disks hold many of our secret information. In the physical world, security is a fairly simple concept. If the locks on your house’s doors and windows are so strong that a thief cannot break in to steal your belongings, the house is secure. For further protection against intruders breaking…