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CHAPTER 14 Operating System Security This section describes various security related aspects like authentication, one time password, threats and security classifications. Security refers to providing a protection system to computer system resources such as CPU, memory, disk, software programs and most importantly data/information stored in the computer system. If a computer program is run by unauthorized user then he/she may cause severe damage to computer or data stored in it. So a computer system must be protected against unauthorized access, malicious access to system memory, viruses, worms etc. We're going to discuss following topics in this article. Authentication One Time passwords Program Threats System Threats Computer Security Classifications TUTORIALS POINT Simply Easy Learning Page 79
Authentication Authentication refers to identifying the each user of the system and associating the executing programs with those users. It is the responsibility of the Operating System to create a protection system which ensures that a user who is running a particular program is authentic. Operating Systems generally identifies/authenticates users using following three ways: Username / Password - User need to enter a registered username and password with Operating system to login into the system. User card/key - User need to punch card in card slot, or enter key generated by key generator in option provided by operating system to login into the system. User attribute - fingerprint/ eye retina pattern/ signature - User need to pass his/her attribute via designated input device used by operating system to login into the system. TUTORIALS POINT Simply Easy Learning Page 80
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Operating System Tutorial
Page 3 and 4:
ABOUT THE TUTORIAL Operating System
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Multiprogramming ..................
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Clocks ............................
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Following are some of important fun
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CHAPTER 2 Types of Operating System
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Distributed operating System Distri
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Real Time operating System Real tim
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Program execution Operating system
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Error handling Error can occur anyt
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Increased performance as a new job
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Multiprogramming When two or more p
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Spooling Spooling is an acronym for
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Program A program by itself is not
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Process Control Block, PCB Each pro
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CHAPTER 6 Operating System Process
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Two State Process Model Two state p
Page 35 and 36: Running process may become suspende
Page 37 and 38: Context Switch A context switch is
Page 39 and 40: First Come First Serve (FCFS) Jo
Page 41 and 42: Priority Based Scheduling Each p
Page 43 and 44: Multi Queue Scheduling Multiple
Page 45 and 46: Difference between Process and Thre
Page 47 and 48: Types of Thread Threads are impleme
Page 49 and 50: Multithreading Models Some operatin
Page 51 and 52: Difference between User Level & Ker
Page 53 and 54: Instructions and data to memory add
Page 55 and 56: Logical versus Physical Address Spa
Page 57 and 58: Memory Allocation Main memory usual
Page 59 and 60: Paging External fragmentation is av
Page 61 and 62: Address generated by CPU is divided
Page 63 and 64: Virtual memory is commonly implemen
Page 65 and 66: Step Description Step 1 Check an in
Page 67 and 68: Page Replacement Algorithm Page rep
Page 69 and 70: Least Recently Used (LRU) algorithm
Page 71 and 72: I/O port An I/O port typically cons
Page 73 and 74: I/O devices I/O Devices can be cate
Page 75 and 76: 4 Disk controller sends each byte t
Page 77 and 78: CHAPTER 12 I/O Software This sectio
Page 79 and 80: Clocks Clocks are also called timer
Page 81 and 82: Device driver Device driver is a pr
Page 83 and 84: File Type File type refers to the a
Page 85: Space Allocation Files are allocate
Page 89 and 90: Program Threats Operating system's
Page 91 and 92: Computer Security Classifications A
Page 93 and 94: Components of Linux System Linux Op
Page 95 and 96: Basic Features Following are some o
Page 97: APPENDIX A About tutorialspoint.com
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