DESIGN OF AN ADDITIONAL PASSWORD SECURITY TO MICROSOFT WINDOWS OPERATING SYSTEM

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Department of Computer Science

DESIGN OF AN ADDITIONAL PASSWORD SECURITY TO MICROSOFT WINDOWS OPERATING SYSTEM

CHAPTER ONE

INTRODUCTION

1.1 BACKGROUND OF THE STUDY

Computer security is information security as applied to computers and networks. The field covers all the processes and mechanisms by which computer-based equipment, information and services are protected from unintended or unauthorized access, change or destruction. Computer security also includes protection from unplanned events and natural disasters Morrie Gasser: Building a secure computer system 1988. In computer security, vulnerability is a weakness which allows an attacker to reduce a system's information assurance. Vulnerability is the intersection of three elements: a system susceptibility or flaw, attacker access to the flaw, and attacker capability to exploit the flaw. To exploit vulnerability, an attacker must have at least one applicable tool or technique that can connect to a system weakness. In this frame, vulnerability is also known as the attack surface. Vulnerability management is the cyclical practice of identifying, classifying, remediating, and mitigating vulnerabilities" This practice generally refers to software vulnerabilities in computing systems. (Paul A. et al, 2008).

A security risk may be classified as vulnerability. The usage of vulnerability with the same meaning of risk can lead to confusion. The risk is tied to the potential of a significant loss. Then there are vulnerabilities without risk: for example when the affected asset has no value. A vulnerability with one or more known instances of working and fully implemented attacks is classified as an exploitable vulnerability “ a vulnerability for which an exploit exists. The window of vulnerability is the time from when the security hole was introduced or manifested in deployed software, to when access was removed, a security fix was available and deployed, or the attacker was disabled. Security bug (security defect) is a narrower concept: there are vulnerabilities that are not related to software: hardware, site, personnel vulnerabilities are examples of vulnerabilities that are not software security bugs (Paul A. et al, 2008)