HOME NETWORK SECURITY

1
HOME NETWORK SECURITY

• Computer Security
• Computer security risks to home users
• Actions home users can take to protect their
  computer systems

2
Computer security What is computer security?
computer security -

• ?? ?????? ???? ? ?????? ?? unauthorized user
  ?????? ??? ????? ????? ?????????? ????????? ???
  ?? ??? ?? ????? ???? ???????? ?????? ?? ?????
  ????? ????? ?????? ???? ????? ? ??? ??? ?????????
  ???? ???? ??? ???.

3
Why should I care about security?

• ????? ??? ?? ???? ?? ???? ????? ??????? ?????
  ?????? ????? ?????? ??????? ??? ??? ?????????
  ??????? ? ????????? ? ?????? ?? ?????? ??????????
  ?? ?????? ???????? ????? ????????? ???? ????????
  ??????? ?? ??????.

4
Who would want to break into my computer at
home/office?

• ?? ????? ?????? ?????? ????? .????? ?????? ??????
  ????? ????????? ?? ?? ??? ???????? ???????,
  ?????? ? ????? ?? ?????? ?????? ?? ???.
• ?? ?? ???????? ?? ??????? ????? ?????? ?????
  ????????? ?????? ?? ?? ?? ????? ?? ?????? ??
  ????? ????? ?? ?????? ??????? ?? ????? ??? ????
  ????????.? ????? ?? ?????? ?????? ?????? ??
  ???????? ?????? ?????? ????? ???? ?? ???? ?????
  ??? ?????? ?????? ?????? ?????? ??????? ??????
  ?????? ???? ???? ?????? ???? ?????? ???.

5

• ???? ?????? ????? ??????? ?? ??????? ??????? .???
  ?? ??? ????? ??? ???????? ????? ?? Games ?? ????
  ????? ?????? ?? ???????? ????? ????? ???? ?? ???
  ????????? ????? ??????? ?? ?????? ?? ???? ????
  ??? ????? ?? ?????? ????? ?????? ??????? ?????
  ????? ?? ???? ??????? ?? ???? ?? ???? ????? ??
  ????? ??? ??? ??????? ?? ????? ?? ???? ???????
  ????? ?????? ????? ??? ????? ??? ????? ?? ???????
  ?? ???????.

6
How easy is it to break into my computer?

• ??? ???? ?????? ????? ???. ???? ???? ?????????
  ????? ??????? ???? ??? ????? ?????? ??? ?????
  ???? ????? ???????? ???Software ???????? ???
  ????? ??? ???? ????? ???? ???? ??? ????? ??
  ??????? ?? ????? ??? ????? ?????? ????? ???????
  ????? ????????? ?????????? ???? ?????? ?? Patches
  ????? ??????? ???? ???? ?? ?????? ??? ??????
  ?????? ?? ??????? ????? ?? Software ?????? ???
  ???? ????.

7

• ???? ???????? ???? ???? ????? ??? ???????? ????
  ?? ????? ?? System administrator and users ?????
  ??????? Up-to date with patches security fixes
  ?? ????? ??????? ? ???? ??? ???????.
• ??? ????????? ????? By default setting ????
  ?????????? ??????? ??? ????? ?? ?? ???? ???????
  ????? ????? ???? ???? ??? ??????? ???? ?????
  ?????? ???? ??? ????? ?? ????????? ???? ???? ??
  ???? ?? ???? ????? ???? ??? ????? ???? ???
  ??????? ??? ???? ?????.

8

• ????? ???? ??????? ??? ??????? ????? ?? ??????
  ??????? ?????? ????? ??? ?? ???? ??? ???? ??????
  ?? ???????? ?? ????? ? ??? ??????? ?? ???? ??????
  ?????? ???????? ?????? ??? ????? ?????? ???
  ?????? ??????? ????? ?????? ???? ????? ?? ???
  ?????? ???? ???? ????? ? ???? ?????? ?? ????
  ????? ????? ??????? ?? ???? ?? ???? ??? ?????.

9

• ????? ?? ?????? ?????? ?? ???? ??? ????? ??? ???
  ??? ????? ????????? ?? ?? ???? ???? ??? ????????
  ?? ???? ????? ???? .????? ??? ????? ????? ???? ??
  ????? ????? ??? ??? ??????? ??? ???????? ?????
  ???? ?????? ?? ?????? ????? ?? ?????.

10
Computer security risks to home usersWhat is at
risk?

• ???? ???? ??? ??????? ??security ????? ?????
  ?????? ????? ?????????? ??? ?? ???? ????? ???
  ?????? ????? ??? ??????? ??????? ?????. ???? ???
  ?? ??? ????? ??????? ??? ???? ???. ????? ????
  ????????? ?????? ????? ????????? ????? ???????
  ???.
• ??? ???????? ???? ????????? ???????? ????? ?????
  ???????? ??????? ???????? ????????.

11

• ?? ??????? ??? ?? ???? ??????? ?? ?????? ???
  ??????? ???? ???? ??????? ??? ???? ??? ??????
  ???? ??? ??? ????? ???? ??? ??????????? ?? ?????
  ?????? ??? ?????? ?? ??????? ????? ???????? ????
  ?????? ??? ????? ???? ?? ??? ????? ????? ?????
  ??? ???????.
• ??? ??????? ???? ?? ??????? ????? ??????? ?????
  ?? ??? ????????? ?????? ??? ???????? .????? ????
  ???? ??????? ??? ?? ??? ?? ??? ?????? ???
  ???????? ???? ??? ??? ????? ?????? ???? ? ????
  ????????????? ?????? ????????? .

12

• ????? ???? ?? ?? ???? ??? ??? ???? ??? ???????
  ???????? .??????? ?????? ?? ???? ??? ???????
  ?????? ?????? ??? ????? ?????? ???????? ??? ?????
  ? ??? ??? ??????? ?????? ?????? ??????? ????????
  ????????.

13
Intentional misuse of your computer ?

• ????? ??????? ????? ?????? ?? ??? ????????? ????
  ?????? ??? ??? ?????? ?? ????? ? ??? ??????? ??
  ???? ?????? ?????? ???????? ?????? ??? ?????
  ?????? ??? ?????? ?????? ??? ????? ?????? ????
  ????? ?? ??? ?????? ?????? ?? ??? ?????? ???
  ???????? ?? ??? ??? ????? ?? ?? ???? ????? ??????
  ???? ?????? ?? ???? ????? ?????? ??????? ??????
  ?? ???? ??? ?????.

14

• ????? ????? ???? ????????? ??????? ???? ?????? ?
  ?? ?????? ?? ???????? ???? ??? ????? ???? ????
  ???? ?? ???? ???? ????? ??????? ?? ?? ???? ??????
  ???? ?? ???? ????? ?? ???? ??? ????? ???? ????
  ???? ????? ? ???? ???? ???????? ?????? ????
  ???? ???? ?????? ??? ???????.

15

• ??? ????? ?????? ?? ?????? ??? ???? ??????? ?????
  ?? ?????? ?????? ?? ????? ???? ????? ??? ???
  ?????? ??? ???? ???
• ??? ??? ??? ????????? ???? ??? ?????? ??????
• ??? ??? ?????? ???? ??? ???? ?? ???? ????? ????
  ????? ????? ???? ?? ???? ?????? ?????? ??? ?????
  ?????? ????????? ?????? ?????? ?????? ???????
  ?????? ?????? ? ???????? ?? ?????.????? ??? ???
  ??? ??? ???? ????????? ????? ?? ???? ?? ??? ??
  ????? ?????? ??? ???????? ?? ???? ???? ?? ????
  ???? ??? ?? ??? ???? ??? ???? ?? ???? ????? ??
  ???? ?? ?????? ?????? ??? ????? ??? ?? ??? ?????
  ???? ??? ?????? .

16

• ?? ?? ????? ???? ??? ???? ???? ?????? ????
  ?????? ??? ???????? ?????? ?? ?????? ??? ?????
  ???? ????? ???? ???? ?? ????? ???? ??? ?????
  ?? ????? ????? ??? ??? ???? ???? ??? ????? ?????
  ??????? ??? ????? ?????? ??????? ??????? ???
  ??????? ????????? ??????? ?? ???????? ? ??? ????
  ?? ????? ???? ???? ??? ????? ?? ?? ???? ???
  ???????? .

17
??????? ???????? ???? ???????? ????????? ??????
?????? ??

• Trojan horse programs
• Back door and remote administrator programs
• Denial of service
• Being an intermediary for another attack
• Unprotected windows shares
• Mobile code (java, JavaScript and active x
  cross-site(
• Scripting
• Email spoofing
• Email born viruses
• Hidden file extensions
• Chat clients
• Packet sniffing

18
Trojan horse programs-

• ????? ???????? ????? ?????? ??? ????????? ??????
  ?????? ?? Back door program ??? ??????? ????
  ????????? ???? ??? ?????? ??? ????? ???? ?????? ?
  ???? ???????? ????? ?? ???? ??? ????? ?? ?????
  ????? ???? ??? ??????? ??? ?????.

19
Back door and remote administrator program

• ????? ??????? ?? ????? ??????( ???? ??? ????
  ????) ?????? ??? ??????? ???? ?????? ???????.
  (Three tools) ?????? ?? ??? ????????? ??????
  ??????? ?? ???? ??? ????? ? ??
• Backorfice, net bus and subs even
• ???? ????? ????? ???? ?? ????.???? ????? ???
  ??????? ??? ????? ???? ????? ???????? ??????
  ??????? ?????? .
• ????? ??? ??????? ??? ????? ???????? ????? ????
  ?????? ????????? ?? ??? ???? ?????? ? ??? ???
  ????? ??????? ?????? ????? ?? ????? ???? ????????
  ?? ?? ??? ????? ?? ???? ?????? ?????? ????? ?????
  ????? ?? ?????? ????? ???? ??????? ? ???? ???
  ??????? ? ??????? ??? ??????? ? ???? ??? ?????
  ????? ?? ????? ???? ???? ????????.

20
Denial of services

• Denial-of-service (dos) attack
• ??? ????? ?? ?????? ???? ????? ?? ???? ?????
  ??????? ???????? ? ?? ?????? ???????? ?? ????
  ???????? ???? ????? ???? ??????? ???? ?? ???? ???
  ???? ???? ??????? ?? ?????? ?? ?????? ?????? ??
  ????? ???????? ?? ?????? ??? ?????? ??????? ???
  ???? ???

21
Being an intermediary for another attack.

• ???? ???? ???? ??????? ??? ??????? . ?????????
  ????? ?? ???????? ????? ??????? ?????? ????????
  ???? ??? ????? ???? ???? ??? ??? ??? ??? ?????
  ????? ????? ?????? (DOS) ????????? ?????? ??????
  ??? ????? ????? (????? ???? ?? ???? ?????
  ????????) ???? ?gt? ?????? ????? ??????? ???????
  ?????? ??? ????? ????.
• ??? ??? ??? ?? ??????? ????? ??? ????? ??????
  ???? ?? ?????? ???? ?? ?????? ????? ?????? ?? ??
  ?????? ??????? ??? ????? ????? .???? ????? ?????
  ??? ??? (?????) ???? ??? ??? (???? ???) ????
  ????? ?? ???? ????? ?? ???? ????

22
Unprotected windows shares.

• ??? ????? ??????? ???????? ??????? ?? ?????????
  ???????? ?? ???? ??????? ??? ?????? ???? ?????
  ?????? ????????? ???? ?????? ?? ?????? ???? ????
  ????? (tools) ??? ??? ???? ?? ????? ?????????
  ?????? ????????? ? ????? ?? ?? security ???
  ???????? ?????? ????? ??? ??? ???? ??? ?? ????
  ????? ??? ????? ??? ???? ???? ??? ????? ????
  .???? ??? ??? ???????? ?? ????? ?????? ?? ?????
  ?????? ?? ??????? ???????? ??? ???????? ?? ????
  ?? Unprotected windows networking shares ?????
  ????
• ????? ?? ???? ??????? ?????? ???????? ????????
  ?????? ????? ??gt? ??????? ??? ??????? ??????? ?
  ????? ??????? ?? ???? ?gt? ?????????.

23
Mobile code java/javascript/activex .

• ???? ?????? ????? ??????? ??
• Mobile code (example java,javascript and
  activex) ??????? ????? ???? ? ??? ?????? ?? ???
  ????????? ???? ????????? ???? ?? ???? ???? ??
  ?????? ??? ???? ??? ?????? ?? ???? Disable for
  java,javascript,activex ??? ??????? ????? ??
  ?????? ??? ??? ??? ??? ????? ????? ???? ?????
  ????? ??? ???? ???? ?????? ??????? ????? ??????
  ???????? ????? ?????? ??? ????? ??? ??????? ????
• ???? ?? html.

24

• Mobile code
• ?? ???? ????? ??? ?????? ?? ???? ???? ??? ????
  ???? ????? ??? ?????? ?????? ???? ???? ?? ????
  ?????? ?????? ????? ??Script ????? ?? ??????? ?
  ????? ?????? ???????? ????? ????
• Download code and active contend especially
  ????? ?? ???? ????? ???? ?????? ?????? ????????

25

• ? ????? ???? ?? ???? ?????? ?????? ???????? ??
  ???? ???? ?????? ???? ???????? ????? ?? ????? ??
  Office ?? ????
• Shock waves and flash animation mobile code,
  body in message

26
Cross-site scripting -

• ???? ???? ?????? ???? ???? ????? ?? ???? ?????
  ??? ???? ???? ??? URL,element, data search ????
  ??? ????? ?????? ??????? ?? ????? ?? ?????? ?????
  ??? ?????? ????? ?????? ??? ????? ?? ????
  ???????
• Following links in web pages
• Email messages
• Newsgroup posting
• ?? ??? ????? ????? ??? ????? ????? ????????
  ?????? ??? ???? ??? ????? ?? ?? ???? ??????
  ??????? ???????? ???????? ? ????? ?? ????? ????
  ???? ???????? ??? ???? ??? ??? ?????? ?????? .

27
Email spoofing

• ?? ?? ???? ?? ??????? ???? ???? ?? ???? ? ?? ??
  ??????? ???? ?? ???? ??? ????? ????? ??????
  ???????? Email spoofing ????? ????? ???? ????????
  ???? ?????? ??????? ?? ????? ?????? ????? ??
  ????? ??????? ????? ??? ???????? .
• Spoofed mail ???? ?????? ?? ????? ?????? ????
  ????? ??????? ??? ????? ????????? ????? ????
  ????? ????? ???? ???? ?? ???? ?????? (????
  ??????) ? ???? ???? ???? ???? ??? ???? ????? ??
  ???? ?????? ??????? ??? ?? ????? ???????? ? ????
  ??? ????? ? ??? ????? ???? ? ????? (???????
  ?????).

28

• ??????- ????? ???? ?????? ??? ??? ??? ??? ????
  ??? ???? ???????? ???? ?? ???? ?? ???? ????? ???
  ?? ????? ???? ????? ?????? ???? ?? ?????? ???
  ???? ??? ??????? ?? ???????? ?? ???? ????? ????
  ???????? ??? ?????? ???? ???? ??? ??????? ?? ????
  ??? ?? ??? ?? ???? ??????? ??????? (Malicious
  internet)????? ?? ???? ????? ??? ????? ??????.

29
Email born viruses-

• ??????? ?????? ?????? ???????? ????????? ??????
  ???? ?? ?? Malicious ???? ??????? ??????? ????
  ???? ????? ????????. ??? ??? ?? ???? ???? ???
  ???? ?????. ??? ???? ??????? ???? ?? ?????? ???
  ?????.
• ??? ?? Melissa viruses ????? ??????? ???? ????
  ???? ?? ?????? ?????? ?? ???? ????? ??? ?? ???
  ??? ?? ?? ?? ???? ??? ??? ?? ???? ?????? ?? ????
  ????? ??? ????? ?? ????? ?????? ???? ???? ????
  ????? ??? ?????? ???? ??????.

30
Hidden file extension-

• ????? ????? ??????? ????? ??? ????? ?????? ??????
  ????? ?????? ????? ?????? ??? ??????? ????? ???
  Enable by default ? ??????? ?????? ?? ??????
  ??????? ??????? ??? ?????? ????? ?????? ???? ????
  ??? ???? ????? Love-letter-for-you.txt or .vs.
  ????? ?? email-born viruses ?????? ??????
  ??????? ???????.??? ???? ???? ???????? ???????
  ??? ?????????? ??????? ??? ????? ??? ???????
  .txt, .vs. ????? ????? ????? ??? ????? ???? ?????.

31
Chat clients-

• ??????? ???????? ????????? ???
• Instant message ,internet relay ,chat IRC
  network IRC) ???? ????????? ????????? ????????
  ?????????? ??? ??????? ??? ???????? .?????? ?????
  ????? ?????????? ??? ??????? ?? ??????? ?????????
  ?????? ???? ????? ???????? ? ?????? ?? ??????? ??
  ?? ???. ???? ??? ???? ??? ???? ?? ??????? ?????
  ??? ????? ???? ?????? ????? ?? ???? ?????
  ????????? ???? ??????? ??????? ?? ???? ?????
  ???????? ??? ?? ???? ????? .????? ??? ???? ??
  ????? ??????? ?? ?????????? ????????? .
• ???? ???? ?? ???? ??? ?????? ?? ??? ? ??? ???
  ???????? ??? ?? ???? ??? ?????? ?? ???? ?? ???
  ????? ?????? ?? ???????? .
• ??? ?? ?? ???? ????? ?????? ??? ?????? ?????? ??
  ???? ?????? ?? ???? ?? ??? ??? ?????? ?????? ???
  ???????? ?????? ??? ?????? ?? ????????? ??? ?????
  ?????? ?? ????? ????? ??????? ??? ???? ??? ?????
  ??? ???? ?? ????? ???? ???? ????? ????? ?? ???
  ?????? ?????? ? ?????????.

32

• Packet sniffing ?? ?????? ?????? ??? ???????? ??
  ???? ??????? ??? ????? ??????? ??? ?????? ????
  ??? ???????? ????? ??? ???????? ?? ????????
  ?????????? ???????? ???? ????? ??? ?????? ????
  ????? (Clear text) ???? ???? ?? ????? ?? ?????
  ???? ??? ????????? ????? ?? ????? ???? ?????? ??
  Packet sniffing. ????????? ???????? ????? ??????
  ????? ???? ??? ???????.

33

• ?? ????? ?????? ?? ???? ????? ??? ?????. ???
  ???? ??????? ???????? ?? DSL and dialup.
• ??????? ???? ???? ??????? ?????? Packet snuffer
  ?????????? ??? ?????? ???? ?????? ???? ???????
  ???? ?????.
• ??? ?? ????? ?????????? ??? ??? ?????? ????
  ?????? ??? ?? ???? ?? LAN ???????? ??????packet
  snuffers ??????? ??? ?????? ???? .

34
Accident and other risks-

• ??? ???? ??????? ??????? ?? ???????? ???? ?????
  ??? ?? ?? ??? ?????? ???? ????????? ???? ???
  ??????? ?????? ? ?????? ???? ??? ??????? ???
  ??? ???????.

35
Disk failure

• ??????? ?????? ?? ??? ??????? ??????? ?? ????
  ????????? ?? ??? ?????? ?? ???????? ??????? ?????
  ??? ????? ????????? ??? ???? ???????? ????? ???
  ????? ?????? ?? ??????? .???????? ????? ???
  ?????? ???? ??? ?? ??????? ?????? ?? ??????? ???
  ???? ?? ??????? ??????????? ? ??device ?????
  ?????? ???? ?? ???? ????? ?????? ?????????
  ??????? ?? ?????????. ??? ?? Backup ?????? ??
  ?????? ?????? ?????? ???.

36
Power failure and surges

• ?????? ?????? ????????? ??? ????? Power ??????
  ?????? ????????? ???? ???? ????? ?????? ???? ??
  ????? ????????? ???? ?????? ??? ????? ?????? ????
  ? ??.

37
Physical failure and surges

• ???? ?????? ?? ????? ?????? ??????? ????? ?????
  ??? ?? ?????? ???? ??????? ??????. ?????? ?????
  ????????? ???? ??? ?? ?????? ???? ??? ????????
  ???? ?? ?????? ??? ?????? ??????? ???????? ????
  ?? Backup ?? ???? ?????? ??????.
• Cryptographic ????? ??????? ????????? ??????
  ???????? ??????? ??? ?????? ???? ???? ??????? ??
  CERT/CC tools ?????? ??? ?????? ??? ??? ??????
  ????? ??? ?????? ????? ?? ????? ?? ?????? ???? ??
  Laptop ?? ???? ????????? ??????.

38
Action home users take to protect their computer
systems-

• ????? ?????? ???????? ?? ?????? ?????? ???? ?????
  ????

39
Consult your-

• ???? ???? ????? ??? ??? ???? ???????? ?? ???????
  ?? ?? ?????? ??? ??? ????? ? Broadband (VPN) ??
  ?? ??? ??? ??? ???? ????? ?? ??????? ????? ????
  ???? ????? ????? ?? ??? ???? ?????? ?????? .????
  ???????? ????? ???? ????? ??????? ??? ?? ???? ??
  ???? .??? ????? ?? ????? ?????? ??? ????????.

40
Use firewall-

• ???? ???????? ??? ????? ?????? ??
• Firewall
• Network appliance
• Personal firewall software package
• Zone alarm
• Lockdown 2000
• Jammer
• Internet alert 99
• Tiny personal firewall

41

• ????????? ?????? ??? ?????? ??????? ?????
  ????????? ?????? ???? ?????.
• firewall ?????? ????? ?? ??????? ?? ???????.
• ?? ???? ???? ???? ???? ?? ???? ??????? ????? ????
  ??? ???? ????? ?????? ?????? ?????? ??security
  ???? ????? ?? ???? . ?????? ??? ?? ?? ???? ????

42
Dont run programs of unknown origin -

• ?? ???? ?????? ?? ???? ??? ????? ?? ???? ????
  ?????? ?????? ??? ??? ??? ?? ??? ??? ?? ?? ????
  ??? ??? .
• ????? ?? ???? ????? ?? ???? ??? ????? ???????? ??
  ?????? ?????? ???? ???? ????? ??? ?????? ????
  ??????.

43
Disable hidden file name extensions-

• ???? ????? ??????? ???? ???? ????? ?? Hide file
  extension ?????? ??????? ????????. ???? ???????
  ???? Enabled by default ???? ???? ????? ???
  Disable ?????? ????? ??????? ?????? ??? ???????.
  ??? ??? Disabling ???? ??????? ??? ??? ???????
  ?????? ???? Registry value ?????????? ??? ????
  ???? ??????? ???? ????? ????? ???? ????? ????
  ???????? ??????? ???????? ?? ???? ??? ?? ????
  ?????????Register value (never show Ext) ??????
  ?????? ???????? ?????? ??????? ???? ??? ???
  ?????????? LNK ??? ??? ?????????? ????? ??? ??
  ????? ??????? ???Disabling hidden filename
  extensions ??????? ???????.

44
??? ???? ??? ?????? Never show Ext

• Remove all occurrence of value never show Ext
  from registry.
• Start
• Run
• Rigidity
• Edit
• Find
• Uncheck the keys ,data
• Look at
• Values
• Enter never show Ext in find what) box and
  click find next

45

• When value has found
• Right click on the value name and delete
• Press F3
• Find the next occurrence of Never Show Ext
• Repeat the previous steps until all occurrence of
  never show ext have been deleted from the
  registry .
• The computer will need to be rebooted for changes
  to take effect.
• ???? ??????? ???? ????? ??????? ??? ?????? ????
  ?? ???? ??? Disable ??????? ???? ????? ??? ???
  ??? ???? ??? Never Show Ext ???? ???? ?? ???????
  ?????.

46
Keep all application (including your operating
system )

• ????? ?????? ??? ???? ??????? ?????? ??? ???? ???
  ?????? ???? ?????. ???? ???????? ???? ???????
  ?????? ?????? ??? ?? Patches and updates ??????
  ?????? ????? ?? ?????? ?? ????? ???????? .????
  ??Manual ?? ?????? ????????? ???????? ??? ????
  ????????.
• ??? ????????? ???? ??? ? Update ??????? ???????
  ?? ?????? ??????? Automatic notification list
  ??? ?? ??? ??? ??????? ???? check ???? ???? ????
  ?? Updates
• Turn off your computer or disconnect from the
  network when not in use-
• ???? ????????? ?? ????? ?? ?????? ????? ??
  ??????? ??? ????????? ?? ???????? ?? ?????? ???
  ????? ?? ??? ?????? ???? ?? ????? ?? ??????.

47
Disable scripting features in email programs

• ?????? ?? ??????? ?????? ????? ?????? ????
  ???????? ?????? ???? ????? .
• ?????? ??? ????? ?? ???? ??? ??????? ?? ???????.

48
Disable java ,JavaScript, and active if possible

• ?? ???? ?? ??????? ??????? ???????? ???????? ???
  ??? Activex,java,and java script
• Malicious web developer ???? ???? ????? ??
  ?????? ??? ???? ???? URL,element,data search
  ????? ?????? ?????? ?? ??????? ????? ????? ???
  ??????? ????? ????? ??? ????? ???? ??Disabling
  for all scripting language???? ??????? ???? ????
  ?? ??????? ???? ?????? Scripting language.

49

• How to disable for the scripting language
• From the internet explorer 5
• Tools
• Internet option
• Security iab
• To disable javascript ,set the security setting
  to(custom)and then click custom level
  ..button. the security setting windows will
  popup. scroll down for the heading scripting

50

• active scripting
• allow paste operations via script ,and
  scripting of java applets.
• Set active scripting to" disabled
• Click ok to close and save the changes to
  security settings.
• Click ok to close internet options .
• Close and restart the browsers ,then please try
  again !

51

• Internet explorer (6)
• To disable JavaScript ,click the custom level
  ..button.
• The security settings window willpopup.scroll
  down for the heading scripting near the bottom
  .there are a few options under scripting active
  scripting ,allow paste operations via script
  ,and scripting of java applets.set active
  scripting to disabled
• Click ok to close and save the changes to
  security setting
• Click ok to close internet options.
• Close and restart the browsers, then please try
  again.

52
Make regular backups of critical data

• ???? ??? ?? ??????? ???????? ??????.
• ???? ???? ??????? ?????? ??? ?? Removable
  media????? ?????? ?? Backup tools ?? ???? ?????
  ? ???? ???Backup ????? ???? ?? ?????????.

53
Make a boot in case your computer damaged or
compromised

• ???? boot disk ?? ???? ?????? ??? ??Floppy disk
  ??? ?????? ????? ???? ?????? ???? ?? ???? ???
  Disk ??? ?? ??? ???? ?? ?? Security.